diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index ddd7c5f30a..16ae302cac 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -10,6 +10,3 @@ RUN apt-get update && \
   DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
     curl tzdata ffmpeg && \
   rm -rf /var/lib/apt/lists/*
-
-# Move tone executable to appropriate directory
-COPY --from=sandreas/tone:v0.1.5 /usr/local/bin/tone /usr/local/bin/
diff --git a/Dockerfile b/Dockerfile
index 97bb4732fb..fe68b304db 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,6 @@ RUN npm ci && npm cache clean --force
 RUN npm run generate
 
 ### STAGE 1: Build server ###
-FROM sandreas/tone:v0.1.5 AS tone
 FROM node:20-alpine
 
 ENV NODE_ENV=production
@@ -21,7 +20,6 @@ RUN apk update && \
     g++ \
     tini
 
-COPY --from=tone /usr/local/bin/tone /usr/local/bin/
 COPY --from=build /client/dist /client/dist
 COPY index.js package* /
 COPY server server
diff --git a/build/debian/DEBIAN/preinst b/build/debian/DEBIAN/preinst
index f43f2683ee..c4692ed340 100644
--- a/build/debian/DEBIAN/preinst
+++ b/build/debian/DEBIAN/preinst
@@ -50,7 +50,6 @@ install_ffmpeg() {
   echo "Starting FFMPEG Install"
 
   WGET="wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-amd64-static.tar.xz --output-document=ffmpeg-git-amd64-static.tar.xz"
-  WGET_TONE="wget https://github.com/sandreas/tone/releases/download/v0.1.5/tone-0.1.5-linux-x64.tar.gz --output-document=tone-0.1.5-linux-x64.tar.gz"
 
   if ! cd "$FFMPEG_INSTALL_DIR"; then
     echo "Creating ffmpeg install dir at $FFMPEG_INSTALL_DIR"
@@ -63,13 +62,7 @@ install_ffmpeg() {
   tar xvf ffmpeg-git-amd64-static.tar.xz --strip-components=1 --no-same-owner
   rm ffmpeg-git-amd64-static.tar.xz
 
-  # Temp downloading tone library to the ffmpeg dir
-  echo "Getting tone.."
-  $WGET_TONE
-  tar xvf tone-0.1.5-linux-x64.tar.gz --strip-components=1 --no-same-owner
-  rm tone-0.1.5-linux-x64.tar.gz
-
-  echo "Good to go on Ffmpeg (& tone)... hopefully"
+  echo "Good to go on Ffmpeg... hopefully"
 }
 
 setup_config() {
@@ -77,12 +70,6 @@ setup_config() {
     echo "Existing config found."
     cat $CONFIG_PATH
 
-    # TONE_PATH variable added in 2.1.6, if it doesnt exist then add it
-    if ! grep -q "TONE_PATH" "$CONFIG_PATH"; then
-      echo "Adding TONE_PATH to existing config"
-      echo "TONE_PATH=$FFMPEG_INSTALL_DIR/tone" >> "$CONFIG_PATH"
-    fi
-
   else
 
     if [ ! -d "$DEFAULT_DATA_DIR" ]; then
@@ -98,7 +85,6 @@ setup_config() {
 CONFIG_PATH=$DEFAULT_DATA_DIR/config
 FFMPEG_PATH=$FFMPEG_INSTALL_DIR/ffmpeg
 FFPROBE_PATH=$FFMPEG_INSTALL_DIR/ffprobe
-TONE_PATH=$FFMPEG_INSTALL_DIR/tone
 PORT=$DEFAULT_PORT
 HOST=$DEFAULT_HOST"
 
diff --git a/client/components/modals/item/tabs/Tools.vue b/client/components/modals/item/tabs/Tools.vue
index de19e04c3a..b05b218799 100644
--- a/client/components/modals/item/tabs/Tools.vue
+++ b/client/components/modals/item/tabs/Tools.vue
@@ -2,11 +2,8 @@
   <div class="w-full h-full overflow-hidden overflow-y-auto px-4 py-6">
     <p class="text-xl font-semibold mb-2">{{ $strings.HeaderAudiobookTools }}</p>
 
-    <!-- alert for windows install -->
-    <widgets-alert v-if="isWindowsInstall" type="warning" class="my-8 text-base">Not supported for the Windows install yet</widgets-alert>
-
     <!-- Merge to m4b -->
-    <div v-if="showM4bDownload && !isWindowsInstall" class="w-full border border-black-200 p-4 my-8">
+    <div v-if="showM4bDownload" class="w-full border border-black-200 p-4 my-8">
       <div class="flex flex-wrap items-center">
         <div>
           <p class="text-lg">{{ $strings.LabelToolsMakeM4b }}</p>
@@ -23,7 +20,7 @@
     </div>
 
     <!-- Embed Metadata -->
-    <div v-if="mediaTracks.length && !isWindowsInstall" class="w-full border border-black-200 p-4 my-8">
+    <div v-if="mediaTracks.length" class="w-full border border-black-200 p-4 my-8">
       <div class="flex items-center">
         <div>
           <p class="text-lg">{{ $strings.LabelToolsEmbedMetadata }}</p>
@@ -111,12 +108,6 @@ export default {
     },
     isEncodeTaskRunning() {
       return this.encodeTask && !this.encodeTask?.isFinished
-    },
-    isWindowsInstall() {
-      return this.Source == 'windows'
-    },
-    Source() {
-      return this.$store.state.Source
     }
   },
   methods: {
@@ -141,4 +132,4 @@ export default {
     }
   }
 }
-</script>
\ No newline at end of file
+</script>
diff --git a/client/pages/audiobook/_id/manage.vue b/client/pages/audiobook/_id/manage.vue
index 03c214b451..8863fd5b4f 100644
--- a/client/pages/audiobook/_id/manage.vue
+++ b/client/pages/audiobook/_id/manage.vue
@@ -11,10 +11,9 @@
       </div>
     </div>
 
-    <div class="flex justify-center">
+    <div class="flex justify-center mb-2">
       <div class="w-full max-w-2xl">
-        <p class="text-xl mb-1">{{ $strings.HeaderMetadataToEmbed }}</p>
-        <p class="mb-2 text-base text-gray-300">audiobookshelf uses <a href="https://github.com/sandreas/tone" target="_blank" class="hover:underline text-blue-400 hover:text-blue-300">tone</a> to write metadata.</p>
+        <p class="text-xl">{{ $strings.HeaderMetadataToEmbed }}</p>
       </div>
       <div class="w-full max-w-2xl"></div>
     </div>
@@ -26,7 +25,7 @@
           <div class="w-2/3 text-xs font-semibold uppercase text-gray-200">{{ $strings.LabelValue }}</div>
         </div>
         <div class="w-full max-h-72 overflow-auto">
-          <template v-for="(value, key, index) in toneObject">
+          <template v-for="(value, key, index) in metadataObject">
             <div :key="key" class="flex py-1 px-4 text-sm" :class="index % 2 === 0 ? 'bg-primary bg-opacity-25' : ''">
               <div class="w-1/3 font-semibold">{{ key }}</div>
               <div class="w-2/3">
@@ -208,7 +207,7 @@ export default {
       processing: false,
       audiofilesEncoding: {},
       audiofilesFinished: {},
-      toneObject: null,
+      metadataObject: null,
       selectedTool: 'embed',
       isCancelingEncode: false,
       showEncodeOptions: false,
@@ -387,7 +386,7 @@ export default {
       window.history.replaceState({ path: newurl }, '', newurl)
     },
     init() {
-      this.fetchToneObject()
+      this.fetchMetadataEmbedObject()
       if (this.$route.query.tool === 'm4b') {
         if (this.availableTools.some((t) => t.value === 'm4b')) {
           this.selectedTool = 'm4b'
@@ -401,15 +400,14 @@ export default {
       const shouldBackupAudioFiles = localStorage.getItem('embedMetadataShouldBackup')
       this.shouldBackupAudioFiles = shouldBackupAudioFiles != 0
     },
-    fetchToneObject() {
+    fetchMetadataEmbedObject() {
       this.$axios
-        .$get(`/api/items/${this.libraryItemId}/tone-object`)
-        .then((toneObject) => {
-          delete toneObject.CoverFile
-          this.toneObject = toneObject
+        .$get(`/api/items/${this.libraryItemId}/metadata-object`)
+        .then((metadataObject) => {
+          this.metadataObject = metadataObject
         })
         .catch((error) => {
-          console.error('Failed to fetch tone object', error)
+          console.error('Failed to fetch metadata object', error)
         })
     },
     taskUpdated(task) {
@@ -426,4 +424,4 @@ export default {
     this.$root.socket.off('audiofile_metadata_finished', this.audiofileMetadataFinished)
   }
 }
-</script>
\ No newline at end of file
+</script>
diff --git a/package-lock.json b/package-lock.json
index 534ac21c57..b6075c4251 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,6 @@
         "graceful-fs": "^4.2.10",
         "htmlparser2": "^8.0.1",
         "lru-cache": "^10.0.3",
-        "node-tone": "^1.0.1",
         "nodemailer": "^6.9.13",
         "openid-client": "^5.6.1",
         "p-throttle": "^4.1.1",
@@ -3661,11 +3660,6 @@
       "integrity": "sha512-uYr7J37ae/ORWdZeQ1xxMJe3NtdmqMC/JZK+geofDrkLUApKRHPd18/TxtBOJ4A0/+uUIliorNrfYV6s1b02eQ==",
       "dev": true
     },
-    "node_modules/node-tone": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/node-tone/-/node-tone-1.0.1.tgz",
-      "integrity": "sha512-wi7L0taDZMN6tM5l85TDKHsYzdhqJTtPNgvgpk2zHeZzPt6ZIUZ9vBLTJRRDpm0xzCvbsvFHjAaudeQjLHTE4w=="
-    },
     "node_modules/nodemailer": {
       "version": "6.9.13",
       "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.9.13.tgz",
diff --git a/package.json b/package.json
index 7914c90d3b..936a8fb53a 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,6 @@
     "graceful-fs": "^4.2.10",
     "htmlparser2": "^8.0.1",
     "lru-cache": "^10.0.3",
-    "node-tone": "^1.0.1",
     "nodemailer": "^6.9.13",
     "openid-client": "^5.6.1",
     "p-throttle": "^4.1.1",
diff --git a/readme.md b/readme.md
index 0dddc34b22..0ff5541e30 100644
--- a/readme.md
+++ b/readme.md
@@ -31,7 +31,7 @@ Audiobookshelf is a self-hosted audiobook and podcast server.
 - Fetch metadata and cover art from several sources
 - Chapter editor and chapter lookup (using [Audnexus API](https://audnex.us/))
 - Merge your audio files into a single m4b
-- Embed metadata and cover image into your audio files (using [Tone](https://github.com/sandreas/tone))
+- Embed metadata and cover image into your audio files
 - Basic ebook support and ereader
   - Epub, pdf, cbr, cbz
   - Send ebook to device (i.e. Kindle)
diff --git a/server/controllers/LibraryItemController.js b/server/controllers/LibraryItemController.js
index 32b098ed0e..117cb0043d 100644
--- a/server/controllers/LibraryItemController.js
+++ b/server/controllers/LibraryItemController.js
@@ -559,9 +559,9 @@ class LibraryItemController {
     })
   }
 
-  getToneMetadataObject(req, res) {
+  getMetadataObject(req, res) {
     if (!req.user.isAdminOrUp) {
-      Logger.error(`[LibraryItemController] Non-admin user attempted to get tone metadata object`, req.user)
+      Logger.error(`[LibraryItemController] Non-admin user attempted to get metadata object`, req.user)
       return res.sendStatus(403)
     }
 
@@ -570,7 +570,7 @@ class LibraryItemController {
       return res.sendStatus(500)
     }
 
-    res.json(this.audioMetadataManager.getToneMetadataObjectForApi(req.libraryItem))
+    res.json(this.audioMetadataManager.getMetadataObjectForApi(req.libraryItem))
   }
 
   // POST: api/items/:id/chapters
diff --git a/server/managers/AbMergeManager.js b/server/managers/AbMergeManager.js
index 8a87df2ec3..711e8892df 100644
--- a/server/managers/AbMergeManager.js
+++ b/server/managers/AbMergeManager.js
@@ -1,4 +1,3 @@
-
 const Path = require('path')
 const fs = require('../libs/fsExtra')
 
@@ -7,7 +6,7 @@ const Logger = require('../Logger')
 const TaskManager = require('./TaskManager')
 const Task = require('../objects/Task')
 const { writeConcatFile } = require('../utils/ffmpegHelpers')
-const toneHelpers = require('../utils/toneHelpers')
+const ffmpegHelpers = require('../utils/ffmpegHelpers')
 
 class AbMergeManager {
   constructor() {
@@ -17,7 +16,7 @@ class AbMergeManager {
   }
 
   getPendingTaskByLibraryItemId(libraryItemId) {
-    return this.pendingTasks.find(t => t.task.data.libraryItemId === libraryItemId)
+    return this.pendingTasks.find((t) => t.task.data.libraryItemId === libraryItemId)
   }
 
   cancelEncode(task) {
@@ -31,23 +30,27 @@ class AbMergeManager {
     const targetFilename = audiobookDirname + '.m4b'
     const itemCachePath = Path.join(this.itemsCacheDir, libraryItem.id)
     const tempFilepath = Path.join(itemCachePath, targetFilename)
+    const ffmetadataPath = Path.join(itemCachePath, 'ffmetadata.txt')
     const taskData = {
       libraryItemId: libraryItem.id,
       libraryItemPath: libraryItem.path,
       userId: user.id,
-      originalTrackPaths: libraryItem.media.tracks.map(t => t.metadata.path),
+      originalTrackPaths: libraryItem.media.tracks.map((t) => t.metadata.path),
       tempFilepath,
       targetFilename,
       targetFilepath: Path.join(libraryItem.path, targetFilename),
       itemCachePath,
-      toneJsonObject: null
+      ffmetadataObject: ffmpegHelpers.getFFMetadataObject(libraryItem, 1),
+      chapters: libraryItem.media.chapters?.map((c) => ({ ...c })),
+      coverPath: libraryItem.media.coverPath,
+      ffmetadataPath
     }
     const taskDescription = `Encoding audiobook "${libraryItem.media.metadata.title}" into a single m4b file.`
     task.setData('encode-m4b', 'Encoding M4b', taskDescription, false, taskData)
     TaskManager.addTask(task)
     Logger.info(`Start m4b encode for ${libraryItem.id} - TaskId: ${task.id}`)
 
-    if (!await fs.pathExists(taskData.itemCachePath)) {
+    if (!(await fs.pathExists(taskData.itemCachePath))) {
       await fs.mkdir(taskData.itemCachePath)
     }
 
@@ -55,6 +58,15 @@ class AbMergeManager {
   }
 
   async runAudiobookMerge(libraryItem, task, encodingOptions) {
+    // Create ffmetadata file
+    const success = await ffmpegHelpers.writeFFMetadataFile(task.data.metadataObject, task.data.chapters, task.data.ffmetadataPath)
+    if (!success) {
+      Logger.error(`[AudioMetadataManager] Failed to write ffmetadata file for audiobook "${task.data.libraryItemId}"`)
+      task.setFailed('Failed to write metadata file.')
+      this.removeTask(task, true)
+      return
+    }
+
     const audioBitrate = encodingOptions.bitrate || '128k'
     const audioCodec = encodingOptions.codec || 'aac'
     const audioChannels = encodingOptions.channels || 2
@@ -90,12 +102,7 @@ class AbMergeManager {
     const ffmpegOutputOptions = ['-f mp4']
 
     if (audioRequiresEncode) {
-      ffmpegOptions = ffmpegOptions.concat([
-        '-map 0:a',
-        `-acodec ${audioCodec}`,
-        `-ac ${audioChannels}`,
-        `-b:a ${audioBitrate}`
-      ])
+      ffmpegOptions = ffmpegOptions.concat(['-map 0:a', `-acodec ${audioCodec}`, `-ac ${audioChannels}`, `-b:a ${audioBitrate}`])
     } else {
       ffmpegOptions.push('-max_muxing_queue_size 1000')
 
@@ -106,24 +113,6 @@ class AbMergeManager {
       }
     }
 
-    let toneJsonPath = null
-    try {
-      toneJsonPath = Path.join(task.data.itemCachePath, 'metadata.json')
-      await toneHelpers.writeToneMetadataJsonFile(libraryItem, libraryItem.media.chapters, toneJsonPath, 1, 'audio/mp4')
-    } catch (error) {
-      Logger.error(`[AbMergeManager] Write metadata.json failed`, error)
-      toneJsonPath = null
-    }
-
-    task.data.toneJsonObject = {
-      'ToneJsonFile': toneJsonPath,
-      'TrackNumber': 1,
-    }
-
-    if (libraryItem.media.coverPath) {
-      task.data.toneJsonObject['CoverFile'] = libraryItem.media.coverPath
-    }
-
     const workerData = {
       inputs: ffmpegInputs,
       options: ffmpegOptions,
@@ -162,7 +151,7 @@ class AbMergeManager {
 
   async sendResult(task, result) {
     // Remove pending task
-    this.pendingTasks = this.pendingTasks.filter(d => d.id !== task.id)
+    this.pendingTasks = this.pendingTasks.filter((d) => d.id !== task.id)
 
     if (result.isKilled) {
       task.setFailed('Ffmpeg task killed')
@@ -177,7 +166,7 @@ class AbMergeManager {
     }
 
     // Write metadata to merged file
-    const success = await toneHelpers.tagAudioFile(task.data.tempFilepath, task.data.toneJsonObject)
+    const success = await ffmpegHelpers.addCoverAndMetadataToFile(task.data.tempFilepath, task.data.coverPath, task.data.ffmetadataPath, 1, 'audio/mp4')
     if (!success) {
       Logger.error(`[AbMergeManager] Failed to write metadata to file "${task.data.tempFilepath}"`)
       task.setFailed('Failed to write metadata to m4b file')
@@ -199,6 +188,9 @@ class AbMergeManager {
     Logger.debug(`[AbMergeManager] Moving m4b from ${task.data.tempFilepath} to ${task.data.targetFilepath}`)
     await fs.move(task.data.tempFilepath, task.data.targetFilepath)
 
+    // Remove ffmetadata file
+    await fs.remove(task.data.ffmetadataPath)
+
     task.setFinished()
     await this.removeTask(task, false)
     Logger.info(`[AbMergeManager] Ab task finished ${task.id}`)
@@ -207,9 +199,9 @@ class AbMergeManager {
   async removeTask(task, removeTempFilepath = false) {
     Logger.info('[AbMergeManager] Removing task ' + task.id)
 
-    const pendingDl = this.pendingTasks.find(d => d.id === task.id)
+    const pendingDl = this.pendingTasks.find((d) => d.id === task.id)
     if (pendingDl) {
-      this.pendingTasks = this.pendingTasks.filter(d => d.id !== task.id)
+      this.pendingTasks = this.pendingTasks.filter((d) => d.id !== task.id)
       if (pendingDl.worker) {
         Logger.warn(`[AbMergeManager] Removing download in progress - stopping worker`)
         try {
@@ -223,13 +215,27 @@ class AbMergeManager {
       }
     }
 
-    if (removeTempFilepath) { // On failed tasks remove the bad file if it exists
+    if (removeTempFilepath) {
+      // On failed tasks remove the bad file if it exists
       if (await fs.pathExists(task.data.tempFilepath)) {
-        await fs.remove(task.data.tempFilepath).then(() => {
-          Logger.info('[AbMergeManager] Deleted target file', task.data.tempFilepath)
-        }).catch((err) => {
-          Logger.error('[AbMergeManager] Failed to delete target file', err)
-        })
+        await fs
+          .remove(task.data.tempFilepath)
+          .then(() => {
+            Logger.info('[AbMergeManager] Deleted target file', task.data.tempFilepath)
+          })
+          .catch((err) => {
+            Logger.error('[AbMergeManager] Failed to delete target file', err)
+          })
+      }
+      if (await fs.pathExists(task.data.ffmetadataPath)) {
+        await fs
+          .remove(task.data.ffmetadataPath)
+          .then(() => {
+            Logger.info('[AbMergeManager] Deleted ffmetadata file', task.data.ffmetadataPath)
+          })
+          .catch((err) => {
+            Logger.error('[AbMergeManager] Failed to delete ffmetadata file', err)
+          })
       }
     }
 
diff --git a/server/managers/AudioMetadataManager.js b/server/managers/AudioMetadataManager.js
index 11c828226f..09b773f6f9 100644
--- a/server/managers/AudioMetadataManager.js
+++ b/server/managers/AudioMetadataManager.js
@@ -5,7 +5,7 @@ const Logger = require('../Logger')
 
 const fs = require('../libs/fsExtra')
 
-const toneHelpers = require('../utils/toneHelpers')
+const ffmpegHelpers = require('../utils/ffmpegHelpers')
 
 const TaskManager = require('./TaskManager')
 
@@ -21,22 +21,19 @@ class AudioMetadataMangaer {
   }
 
   /**
-  * Get queued task data
-  * @return {Array}
-  */
+   * Get queued task data
+   * @return {Array}
+   */
   getQueuedTaskData() {
-    return this.tasksQueued.map(t => t.data)
+    return this.tasksQueued.map((t) => t.data)
   }
 
   getIsLibraryItemQueuedOrProcessing(libraryItemId) {
-    return this.tasksQueued.some(t => t.data.libraryItemId === libraryItemId) || this.tasksRunning.some(t => t.data.libraryItemId === libraryItemId)
+    return this.tasksQueued.some((t) => t.data.libraryItemId === libraryItemId) || this.tasksRunning.some((t) => t.data.libraryItemId === libraryItemId)
   }
 
-  getToneMetadataObjectForApi(libraryItem) {
-    const audioFiles = libraryItem.media.includedAudioFiles
-    let mimeType = audioFiles[0].mimeType
-    if (audioFiles.some(a => a.mimeType !== mimeType)) mimeType = null
-    return toneHelpers.getToneMetadataObject(libraryItem, libraryItem.media.chapters, libraryItem.media.tracks.length, mimeType)
+  getMetadataObjectForApi(libraryItem) {
+    return ffmpegHelpers.getFFMetadataObject(libraryItem, libraryItem.media.includedAudioFiles.length)
   }
 
   handleBatchEmbed(user, libraryItems, options = {}) {
@@ -56,29 +53,28 @@ class AudioMetadataMangaer {
     const itemCachePath = Path.join(this.itemsCacheDir, libraryItem.id)
 
     // Only writing chapters for single file audiobooks
-    const chapters = (audioFiles.length == 1 || forceEmbedChapters) ? libraryItem.media.chapters.map(c => ({ ...c })) : null
+    const chapters = audioFiles.length == 1 || forceEmbedChapters ? libraryItem.media.chapters.map((c) => ({ ...c })) : null
 
     let mimeType = audioFiles[0].mimeType
-    if (audioFiles.some(a => a.mimeType !== mimeType)) mimeType = null
+    if (audioFiles.some((a) => a.mimeType !== mimeType)) mimeType = null
 
     // Create task
     const taskData = {
       libraryItemId: libraryItem.id,
       libraryItemPath: libraryItem.path,
       userId: user.id,
-      audioFiles: audioFiles.map(af => (
-        {
-          index: af.index,
-          ino: af.ino,
-          filename: af.metadata.filename,
-          path: af.metadata.path,
-          cachePath: Path.join(itemCachePath, af.metadata.filename)
-        }
-      )),
+      audioFiles: audioFiles.map((af) => ({
+        index: af.index,
+        ino: af.ino,
+        filename: af.metadata.filename,
+        path: af.metadata.path,
+        cachePath: Path.join(itemCachePath, af.metadata.filename)
+      })),
       coverPath: libraryItem.media.coverPath,
-      metadataObject: toneHelpers.getToneMetadataObject(libraryItem, chapters, audioFiles.length, mimeType),
+      metadataObject: ffmpegHelpers.getFFMetadataObject(libraryItem, audioFiles.length),
       itemCachePath,
       chapters,
+      mimeType,
       options: {
         forceEmbedChapters,
         backupFiles
@@ -107,18 +103,17 @@ class AudioMetadataMangaer {
 
     // Ensure item cache dir exists
     let cacheDirCreated = false
-    if (!await fs.pathExists(task.data.itemCachePath)) {
+    if (!(await fs.pathExists(task.data.itemCachePath))) {
       await fs.mkdir(task.data.itemCachePath)
       cacheDirCreated = true
     }
 
-    // Create metadata json file
-    const toneJsonPath = Path.join(task.data.itemCachePath, 'metadata.json')
-    try {
-      await fs.writeFile(toneJsonPath, JSON.stringify({ meta: task.data.metadataObject }, null, 2))
-    } catch (error) {
-      Logger.error(`[AudioMetadataManager] Write metadata.json failed`, error)
-      task.setFailed('Failed to write metadata.json')
+    // Create ffmetadata file
+    const ffmetadataPath = Path.join(task.data.itemCachePath, 'ffmetadata.txt')
+    const success = await ffmpegHelpers.writeFFMetadataFile(task.data.metadataObject, task.data.chapters, ffmetadataPath)
+    if (!success) {
+      Logger.error(`[AudioMetadataManager] Failed to write ffmetadata file for audiobook "${task.data.libraryItemId}"`)
+      task.setFailed('Failed to write metadata file.')
       this.handleTaskFinished(task)
       return
     }
@@ -141,16 +136,7 @@ class AudioMetadataMangaer {
         }
       }
 
-      const _toneMetadataObject = {
-        'ToneJsonFile': toneJsonPath,
-        'TrackNumber': af.index,
-      }
-
-      if (task.data.coverPath) {
-        _toneMetadataObject['CoverFile'] = task.data.coverPath
-      }
-
-      const success = await toneHelpers.tagAudioFile(af.path, _toneMetadataObject)
+      const success = await ffmpegHelpers.addCoverAndMetadataToFile(af.path, task.data.coverPath, ffmetadataPath, af.index, task.data.mimeType)
       if (success) {
         Logger.info(`[AudioMetadataManager] Successfully tagged audio file "${af.path}"`)
       }
@@ -167,7 +153,7 @@ class AudioMetadataMangaer {
       if (cacheDirCreated) {
         await fs.remove(task.data.itemCachePath)
       } else {
-        await fs.remove(toneJsonPath)
+        await fs.remove(ffmetadataPath)
       }
     }
 
@@ -177,7 +163,7 @@ class AudioMetadataMangaer {
 
   handleTaskFinished(task) {
     TaskManager.taskFinished(task)
-    this.tasksRunning = this.tasksRunning.filter(t => t.id !== task.id)
+    this.tasksRunning = this.tasksRunning.filter((t) => t.id !== task.id)
 
     if (this.tasksRunning.length < this.MAX_CONCURRENT_TASKS && this.tasksQueued.length) {
       Logger.info(`[AudioMetadataManager] Task finished and dequeueing next task. ${this.tasksQueued} tasks queued.`)
diff --git a/server/objects/metadata/AudioMetaTags.js b/server/objects/metadata/AudioMetaTags.js
index 3e032c3255..404c74837e 100644
--- a/server/objects/metadata/AudioMetaTags.js
+++ b/server/objects/metadata/AudioMetaTags.js
@@ -61,7 +61,7 @@ class AudioMetaTags {
 
     // Track ID3 tag might be "3/10" or just "3"
     if (this.tagTrack) {
-      const trackParts = this.tagTrack.split('/').map(part => Number(part))
+      const trackParts = this.tagTrack.split('/').map((part) => Number(part))
       if (trackParts.length > 0) {
         // Fractional track numbers not supported
         data.number = !isNaN(trackParts[0]) ? Math.trunc(trackParts[0]) : null
@@ -81,7 +81,7 @@ class AudioMetaTags {
     }
 
     if (this.tagDisc) {
-      const discParts = this.tagDisc.split('/').map(p => Number(p))
+      const discParts = this.tagDisc.split('/').map((p) => Number(p))
       if (discParts.length > 0) {
         data.number = !isNaN(discParts[0]) ? Math.trunc(discParts[0]) : null
       }
@@ -93,10 +93,18 @@ class AudioMetaTags {
     return data
   }
 
-  get discNumber() { return this.discNumAndTotal.number }
-  get discTotal() { return this.discNumAndTotal.total }
-  get trackNumber() { return this.trackNumAndTotal.number }
-  get trackTotal() { return this.trackNumAndTotal.total }
+  get discNumber() {
+    return this.discNumAndTotal.number
+  }
+  get discTotal() {
+    return this.discNumAndTotal.total
+  }
+  get trackNumber() {
+    return this.trackNumAndTotal.number
+  }
+  get trackTotal() {
+    return this.trackNumAndTotal.total
+  }
 
   construct(metadata) {
     this.tagAlbum = metadata.tagAlbum || null
@@ -177,10 +185,6 @@ class AudioMetaTags {
     this.tagMusicBrainzArtistId = payload.file_tag_musicbrainz_artistid || null
   }
 
-  setDataFromTone(tags) {
-    // TODO: Implement
-  }
-
   updateData(payload) {
     const dataMap = {
       tagAlbum: payload.file_tag_album || null,
@@ -243,4 +247,4 @@ class AudioMetaTags {
     return true
   }
 }
-module.exports = AudioMetaTags
\ No newline at end of file
+module.exports = AudioMetaTags
diff --git a/server/routers/ApiRouter.js b/server/routers/ApiRouter.js
index be4953ee15..52c81d0249 100644
--- a/server/routers/ApiRouter.js
+++ b/server/routers/ApiRouter.js
@@ -114,7 +114,7 @@ class ApiRouter {
     this.router.post('/items/:id/play/:episodeId', LibraryItemController.middleware.bind(this), LibraryItemController.startEpisodePlaybackSession.bind(this))
     this.router.patch('/items/:id/tracks', LibraryItemController.middleware.bind(this), LibraryItemController.updateTracks.bind(this))
     this.router.post('/items/:id/scan', LibraryItemController.middleware.bind(this), LibraryItemController.scan.bind(this))
-    this.router.get('/items/:id/tone-object', LibraryItemController.middleware.bind(this), LibraryItemController.getToneMetadataObject.bind(this))
+    this.router.get('/items/:id/metadata-object', LibraryItemController.middleware.bind(this), LibraryItemController.getMetadataObject.bind(this))
     this.router.post('/items/:id/chapters', LibraryItemController.middleware.bind(this), LibraryItemController.updateMediaChapters.bind(this))
     this.router.get('/items/:id/ffprobe/:fileid', LibraryItemController.middleware.bind(this), LibraryItemController.getFFprobeData.bind(this))
     this.router.get('/items/:id/file/:fileid', LibraryItemController.middleware.bind(this), LibraryItemController.getLibraryFile.bind(this))
diff --git a/server/scanner/MediaProbeData.js b/server/scanner/MediaProbeData.js
index a9ccbe53f9..19480968ea 100644
--- a/server/scanner/MediaProbeData.js
+++ b/server/scanner/MediaProbeData.js
@@ -63,15 +63,5 @@ class MediaProbeData {
     this.audioMetaTags = new AudioMetaTags()
     this.audioMetaTags.setData(data.tags)
   }
-
-  setDataFromTone(data) {
-    // TODO: Implement
-
-    this.format = data.format
-    this.duration = data.duration
-    this.size = data.size
-    this.audioMetaTags = new AudioMetaTags()
-    this.audioMetaTags.setDataFromTone(data.tags)
-  }
 }
-module.exports = MediaProbeData
\ No newline at end of file
+module.exports = MediaProbeData
diff --git a/server/utils/ffmpegHelpers.js b/server/utils/ffmpegHelpers.js
index 491f59dce4..2a242504a7 100644
--- a/server/utils/ffmpegHelpers.js
+++ b/server/utils/ffmpegHelpers.js
@@ -1,9 +1,11 @@
 const axios = require('axios')
 const Ffmpeg = require('../libs/fluentFfmpeg')
 const fs = require('../libs/fsExtra')
+const os = require('os')
 const Path = require('path')
 const Logger = require('../Logger')
 const { filePathToPOSIX } = require('./fileUtils')
+const LibraryItem = require('../objects/LibraryItem')
 
 function escapeSingleQuotes(path) {
   // return path.replace(/'/g, '\'\\\'\'')
@@ -184,3 +186,183 @@ module.exports.downloadPodcastEpisode = (podcastEpisodeDownload) => {
     ffmpeg.run()
   })
 }
+
+/**
+ * Generates ffmetadata file content from the provided metadata object and chapters array.
+ * @param {Object} metadata - The input metadata object.
+ * @param {Array|null} chapters - An array of chapter objects.
+ * @returns {string} - The ffmetadata file content.
+ */
+function generateFFMetadata(metadata, chapters) {
+  let ffmetadataContent = ';FFMETADATA1\n'
+
+  // Add global metadata
+  for (const key in metadata) {
+    if (metadata[key]) {
+      ffmetadataContent += `${key}=${escapeFFMetadataValue(metadata[key])}\n`
+    }
+  }
+
+  // Add chapters
+  if (chapters) {
+    chapters.forEach((chapter) => {
+      ffmetadataContent += '\n[CHAPTER]\n'
+      ffmetadataContent += `TIMEBASE=1/1000\n`
+      ffmetadataContent += `START=${Math.floor(chapter.start * 1000)}\n`
+      ffmetadataContent += `END=${Math.floor(chapter.end * 1000)}\n`
+      if (chapter.title) {
+        ffmetadataContent += `title=${escapeFFMetadataValue(chapter.title)}\n`
+      }
+    })
+  }
+
+  return ffmetadataContent
+}
+
+module.exports.generateFFMetadata = generateFFMetadata
+
+/**
+ * Writes FFmpeg metadata file with the given metadata and chapters.
+ *
+ * @param {Object} metadata - The metadata object.
+ * @param {Array} chapters - The array of chapter objects.
+ * @param {string} ffmetadataPath - The path to the FFmpeg metadata file.
+ * @returns {Promise<boolean>} - A promise that resolves to true if the file was written successfully, false otherwise.
+ */
+async function writeFFMetadataFile(metadata, chapters, ffmetadataPath) {
+  try {
+    await fs.writeFile(ffmetadataPath, generateFFMetadata(metadata, chapters))
+    Logger.debug(`[ffmpegHelpers] Wrote ${ffmetadataPath}`)
+    return true
+  } catch (error) {
+    Logger.error(`[ffmpegHelpers] Write ${ffmetadataPath} failed`, error)
+    return false
+  }
+}
+
+module.exports.writeFFMetadataFile = writeFFMetadataFile
+
+/**
+ * Adds an ffmetadata and optionally a cover image to an audio file using fluent-ffmpeg.
+ *
+ * @param {string} audioFilePath - Path to the input audio file.
+ * @param {string|null} coverFilePath - Path to the cover image file.
+ * @param {string} metadataFilePath - Path to the ffmetadata file.
+ * @param {number} track - The track number to embed in the audio file.
+ * @param {string} mimeType - The MIME type of the audio file.
+ * @param {Ffmpeg} ffmpeg - The Ffmpeg instance to use (optional). Used for dependency injection in tests.
+ * @returns {Promise<boolean>} A promise that resolves to true if the operation is successful, false otherwise.
+ */
+async function addCoverAndMetadataToFile(audioFilePath, coverFilePath, metadataFilePath, track, mimeType, ffmpeg = Ffmpeg()) {
+  const isMp4 = mimeType === 'audio/mp4'
+  const isMp3 = mimeType === 'audio/mpeg'
+
+  const audioFileDir = Path.dirname(audioFilePath)
+  const audioFileExt = Path.extname(audioFilePath)
+  const audioFileBaseName = Path.basename(audioFilePath, audioFileExt)
+  const tempFilePath = filePathToPOSIX(Path.join(audioFileDir, `${audioFileBaseName}.tmp${audioFileExt}`))
+
+  return new Promise((resolve) => {
+    ffmpeg.input(audioFilePath).input(metadataFilePath).outputOptions([
+      '-map 0:a', // map audio stream from input file
+      '-map_metadata 1', // map metadata tags from metadata file first
+      '-map_metadata 0', // add additional metadata tags from input file
+      '-map_chapters 1', // map chapters from metadata file
+      '-c copy' // copy streams
+    ])
+
+    if (track && !isNaN(track)) {
+      ffmpeg.outputOptions(['-metadata track=' + track])
+    }
+
+    if (isMp4) {
+      ffmpeg.outputOptions([
+        '-f mp4' // force output format to mp4
+      ])
+    } else if (isMp3) {
+      ffmpeg.outputOptions([
+        '-id3v2_version 3' // set ID3v2 version to 3
+      ])
+    }
+
+    if (coverFilePath) {
+      ffmpeg.input(coverFilePath).outputOptions([
+        '-map 2:v', // map video stream from cover image file
+        '-disposition:v:0 attached_pic', // set cover image as attached picture
+        '-metadata:s:v',
+        'title=Cover', // add title metadata to cover image stream
+        '-metadata:s:v',
+        'comment=Cover' // add comment metadata to cover image stream
+      ])
+    } else {
+      ffmpeg.outputOptions([
+        '-map 0:v?' // retain video stream from input file if exists
+      ])
+    }
+
+    ffmpeg
+      .output(tempFilePath)
+      .on('start', function (commandLine) {
+        Logger.debug('[ffmpegHelpers] Spawned Ffmpeg with command: ' + commandLine)
+      })
+      .on('end', (stdout, stderr) => {
+        Logger.debug('[ffmpegHelpers] ffmpeg stdout:', stdout)
+        Logger.debug('[ffmpegHelpers] ffmpeg stderr:', stderr)
+        fs.copyFileSync(tempFilePath, audioFilePath)
+        fs.unlinkSync(tempFilePath)
+        resolve(true)
+      })
+      .on('error', (err, stdout, stderr) => {
+        Logger.error('Error adding cover image and metadata:', err)
+        Logger.error('ffmpeg stdout:', stdout)
+        Logger.error('ffmpeg stderr:', stderr)
+        resolve(false)
+      })
+
+    ffmpeg.run()
+  })
+}
+
+module.exports.addCoverAndMetadataToFile = addCoverAndMetadataToFile
+
+function escapeFFMetadataValue(value) {
+  return value.replace(/([;=\n\\#])/g, '\\$1')
+}
+
+/**
+ * Retrieves the FFmpeg metadata object for a given library item.
+ *
+ * @param {LibraryItem} libraryItem - The library item containing the media metadata.
+ * @param {number} audioFilesLength - The length of the audio files.
+ * @returns {Object} - The FFmpeg metadata object.
+ */
+function getFFMetadataObject(libraryItem, audioFilesLength) {
+  const metadata = libraryItem.media.metadata
+
+  const ffmetadata = {
+    title: metadata.title,
+    artist: metadata.authorName,
+    album_artist: metadata.authorName,
+    album: (metadata.title || '') + (metadata.subtitle ? `: ${metadata.subtitle}` : ''),
+    TIT3: metadata.subtitle, // mp3 only
+    genre: metadata.genres?.join('; '),
+    date: metadata.publishedYear,
+    comment: metadata.description,
+    description: metadata.description,
+    composer: metadata.narratorName,
+    copyright: metadata.publisher,
+    publisher: metadata.publisher, // mp3 only
+    TRACKTOTAL: `${audioFilesLength}`, // mp3 only
+    grouping: metadata.series?.map((s) => s.name + (s.sequence ? ` #${s.sequence}` : '')).join(', ')
+  }
+
+  Object.keys(ffmetadata).forEach((key) => {
+    if (!ffmetadata[key]) {
+      delete ffmetadata[key]
+    }
+  })
+
+  return ffmetadata
+}
+
+module.exports.getFFMetadataObject = getFFMetadataObject
diff --git a/server/utils/toneHelpers.js b/server/utils/toneHelpers.js
deleted file mode 100644
index 72ccdb69cb..0000000000
--- a/server/utils/toneHelpers.js
+++ /dev/null
@@ -1,113 +0,0 @@
-const tone = require('node-tone')
-const fs = require('../libs/fsExtra')
-const Logger = require('../Logger')
-
-function getToneMetadataObject(libraryItem, chapters, trackTotal, mimeType = null) {
-  const bookMetadata = libraryItem.media.metadata
-  const coverPath = libraryItem.media.coverPath
-
-  const isMp4 = mimeType === 'audio/mp4'
-  const isMp3 = mimeType === 'audio/mpeg'
-
-  const metadataObject = {
-    'album': bookMetadata.title || '',
-    'title': bookMetadata.title || '',
-    'trackTotal': trackTotal,
-    'additionalFields': {}
-  }
-  if (bookMetadata.subtitle) {
-    metadataObject['subtitle'] = bookMetadata.subtitle
-  }
-  if (bookMetadata.authorName) {
-    metadataObject['artist'] = bookMetadata.authorName
-    metadataObject['albumArtist'] = bookMetadata.authorName
-  }
-  if (bookMetadata.description) {
-    metadataObject['comment'] = bookMetadata.description
-    metadataObject['description'] = bookMetadata.description
-  }
-  if (bookMetadata.narratorName) {
-    metadataObject['narrator'] = bookMetadata.narratorName
-    metadataObject['composer'] = bookMetadata.narratorName
-  }
-  if (bookMetadata.firstSeriesName) {
-    if (!isMp3) {
-      metadataObject.additionalFields['----:com.pilabor.tone:SERIES'] = bookMetadata.firstSeriesName
-    }
-    metadataObject['movementName'] = bookMetadata.firstSeriesName
-  }
-  if (bookMetadata.firstSeriesSequence) {
-    // Non-mp3 
-    if (!isMp3) {
-      metadataObject.additionalFields['----:com.pilabor.tone:PART'] = bookMetadata.firstSeriesSequence
-    }
-    // MP3 Files with non-integer sequence
-    const isNonIntegerSequence = String(bookMetadata.firstSeriesSequence).includes('.') || isNaN(bookMetadata.firstSeriesSequence)
-    if (isMp3 && isNonIntegerSequence) {
-      metadataObject.additionalFields['PART'] = bookMetadata.firstSeriesSequence
-    }
-    if (!isNonIntegerSequence) {
-      metadataObject['movement'] = bookMetadata.firstSeriesSequence
-    }
-  }
-  if (bookMetadata.genres.length) {
-    metadataObject['genre'] = bookMetadata.genres.join('/')
-  }
-  if (bookMetadata.publisher) {
-    metadataObject['publisher'] = bookMetadata.publisher
-  }
-  if (bookMetadata.asin) {
-    if (!isMp3) {
-      metadataObject.additionalFields['----:com.pilabor.tone:AUDIBLE_ASIN'] = bookMetadata.asin
-    }
-    if (!isMp4) {
-      metadataObject.additionalFields['asin'] = bookMetadata.asin
-    }
-  }
-  if (bookMetadata.isbn) {
-    metadataObject.additionalFields['isbn'] = bookMetadata.isbn
-  }
-  if (coverPath) {
-    metadataObject['coverFile'] = coverPath
-  }
-  if (parsePublishedYear(bookMetadata.publishedYear)) {
-    metadataObject['publishingDate'] = parsePublishedYear(bookMetadata.publishedYear)
-  }
-  if (chapters && chapters.length > 0) {
-    let metadataChapters = []
-    for (const chapter of chapters) {
-      metadataChapters.push({
-        start: Math.round(chapter.start * 1000),
-        length: Math.round((chapter.end - chapter.start) * 1000),
-        title: chapter.title,
-      })
-    }
-    metadataObject['chapters'] = metadataChapters
-  }
-
-  return metadataObject
-}
-module.exports.getToneMetadataObject = getToneMetadataObject
-
-module.exports.writeToneMetadataJsonFile = (libraryItem, chapters, filePath, trackTotal, mimeType) => {
-  const metadataObject = getToneMetadataObject(libraryItem, chapters, trackTotal, mimeType)
-  return fs.writeFile(filePath, JSON.stringify({ meta: metadataObject }, null, 2))
-}
-
-module.exports.tagAudioFile = (filePath, payload) => {
-  if (process.env.TONE_PATH) {
-    tone.TONE_PATH = process.env.TONE_PATH
-  }
-
-  return tone.tag(filePath, payload).then((data) => {
-    return true
-  }).catch((error) => {
-    Logger.error(`[toneHelpers] tagAudioFile: Failed for "${filePath}"`, error)
-    return false
-  })
-}
-
-function parsePublishedYear(publishedYear) {
-  if (isNaN(publishedYear) || !publishedYear || Number(publishedYear) <= 0) return null
-  return `01/01/${publishedYear}`
-}
\ No newline at end of file
diff --git a/server/utils/toneProber.js b/server/utils/toneProber.js
deleted file mode 100644
index d415941b6c..0000000000
--- a/server/utils/toneProber.js
+++ /dev/null
@@ -1,173 +0,0 @@
-const tone = require('node-tone')
-const MediaProbeData = require('../scanner/MediaProbeData')
-const Logger = require('../Logger')
-
-/*
-Sample dump from tone
-{
-  "audio": {
-    "bitrate": 17,
-    "format": "MPEG-4 Part 14",
-    "formatShort": "MPEG-4",
-    "sampleRate": 44100.0,
-    "duration": 209284.0,
-    "channels": {
-      "count": 2,
-      "description": "Stereo (2/0.0)"
-    },
-    "frames": {
-      "offset": 42168,
-      "length": 446932
-    "metaFormat": [
-      "mp4"
-    ]
-  },
-  "meta": {
-    "album": "node-tone",
-    "albumArtist": "advplyr",
-    "artist": "advplyr",
-    "composer": "Composer 5",
-    "comment": "testing out tone metadata",
-    "encodingTool": "audiobookshelf",
-    "genre": "abs",
-    "itunesCompilation": "no",
-    "itunesMediaType": "audiobook",
-    "itunesPlayGap": "noGap",
-    "narrator": "Narrator 5",
-    "recordingDate": "2022-09-10T00:00:00",
-    "title": "Test 5",
-    "trackNumber": 5,
-    "chapters": [
-      {
-        "start": 0,
-        "length": 500,
-        "title": "chapter 1"
-      },
-      {
-        "start": 500,
-        "length": 500,
-        "title": "chapter 2"
-      },
-      {
-        "start": 1000,
-        "length": 208284,
-        "title": "chapter 3"
-      }
-    ],
-    "embeddedPictures": [
-      {
-        "code": 14,
-        "mimetype": "image/png",
-        "data": "..."
-    },
-    "additionalFields": {
-      "test": "Test 5"
-    }
-  },
-  "file": {
-    "size": 530793,
-    "created": "2022-09-10T13:32:51.1942586-05:00",
-    "modified": "2022-09-10T14:09:19.366071-05:00",
-    "accessed": "2022-09-11T13:00:56.5097533-05:00",
-    "path": "C:\\Users\\Coop\\Documents\\NodeProjects\\node-tone\\samples",
-    "name": "m4b.m4b"
-  }
-
-*/
-
-function bitrateKilobitToBit(bitrate) {
-  if (isNaN(bitrate) || !bitrate) return 0
-  return Number(bitrate) * 1000
-}
-
-function msToSeconds(ms) {
-  if (isNaN(ms) || !ms) return 0
-  return Number(ms) / 1000
-}
-
-function parseProbeDump(dumpPayload) {
-  const audioMetadata = dumpPayload.audio
-  const audioChannels = audioMetadata.channels || {}
-  const audio_stream = {
-    bit_rate: bitrateKilobitToBit(audioMetadata.bitrate), // tone uses Kbps but ffprobe uses bps so convert to bits
-    codec: null,
-    time_base: null,
-    language: null,
-    channel_layout: audioChannels.description || null,
-    channels: audioChannels.count || null,
-    sample_rate: audioMetadata.sampleRate || null
-  }
-
-  let chapterIndex = 0
-  const chapters = (dumpPayload.meta.chapters || []).map(chap => {
-    return {
-      id: chapterIndex++,
-      start: msToSeconds(chap.start),
-      end: msToSeconds(chap.start + chap.length),
-      title: chap.title || ''
-    }
-  })
-
-  var video_stream = null
-  if (dumpPayload.meta.embeddedPictures && dumpPayload.meta.embeddedPictures.length) {
-    const mimetype = dumpPayload.meta.embeddedPictures[0].mimetype
-    video_stream = {
-      codec: mimetype === 'image/png' ? 'png' : 'jpeg'
-    }
-  }
-
-  const tags = { ...dumpPayload.meta }
-  delete tags.chapters
-  delete tags.embeddedPictures
-
-  const fileMetadata = dumpPayload.file
-  var sizeBytes = !isNaN(fileMetadata.size) ? Number(fileMetadata.size) : null
-  var sizeMb = sizeBytes !== null ? Number((sizeBytes / (1024 * 1024)).toFixed(2)) : null
-  return {
-    format: audioMetadata.format || 'Unknown',
-    duration: msToSeconds(audioMetadata.duration),
-    size: sizeBytes,
-    sizeMb,
-    bit_rate: audio_stream.bit_rate,
-    audio_stream,
-    video_stream,
-    chapters,
-    tags
-  }
-}
-
-module.exports.probe = (filepath, verbose = false) => {
-  if (process.env.TONE_PATH) {
-    tone.TONE_PATH = process.env.TONE_PATH
-  }
-
-  return tone.dump(filepath).then((dumpPayload) => {
-    if (verbose) {
-      Logger.debug(`[toneProber] dump for file "${filepath}"`, dumpPayload)
-    }
-    const rawProbeData = parseProbeDump(dumpPayload)
-    const probeData = new MediaProbeData()
-    probeData.setDataFromTone(rawProbeData)
-    return probeData
-  }).catch((error) => {
-    Logger.error(`[toneProber] Failed to probe file at path "${filepath}"`, error)
-    return {
-      error
-    }
-  })
-}
-
-module.exports.rawProbe = (filepath) => {
-  if (process.env.TONE_PATH) {
-    tone.TONE_PATH = process.env.TONE_PATH
-  }
-
-  return tone.dump(filepath).then((dumpPayload) => {
-    return dumpPayload
-  }).catch((error) => {
-    Logger.error(`[toneProber] Failed to probe file at path "${filepath}"`, error)
-    return {
-      error
-    }
-  })
-}
\ No newline at end of file
diff --git a/test/server/utils/ffmpegHelpers.test.js b/test/server/utils/ffmpegHelpers.test.js
new file mode 100644
index 0000000000..82daf1ba0d
--- /dev/null
+++ b/test/server/utils/ffmpegHelpers.test.js
@@ -0,0 +1,249 @@
+const { expect } = require('chai')
+const sinon = require('sinon')
+const { generateFFMetadata, addCoverAndMetadataToFile } = require('../../../server/utils/ffmpegHelpers')
+const fs = require('../../../server/libs/fsExtra')
+const EventEmitter = require('events')
+
+global.isWin = process.platform === 'win32'
+
+describe('generateFFMetadata', () => {
+  function createTestSetup() {
+    const metadata = {
+      title: 'My Audiobook',
+      artist: 'John Doe',
+      album: 'Best Audiobooks'
+    }
+
+    const chapters = [
+      { start: 0, end: 1000, title: 'Chapter 1' },
+      { start: 1000, end: 2000, title: 'Chapter 2' }
+    ]
+
+    return { metadata, chapters }
+  }
+
+  let metadata = null
+  let chapters = null
+  beforeEach(() => {
+    const input = createTestSetup()
+    metadata = input.metadata
+    chapters = input.chapters
+  })
+
+  it('should generate ffmetadata content with chapters', () => {
+    const result = generateFFMetadata(metadata, chapters)
+
+    expect(result).to.equal(';FFMETADATA1\ntitle=My Audiobook\nartist=John Doe\nalbum=Best Audiobooks\n\n[CHAPTER]\nTIMEBASE=1/1000\nSTART=0\nEND=1000000\ntitle=Chapter 1\n\n[CHAPTER]\nTIMEBASE=1/1000\nSTART=1000000\nEND=2000000\ntitle=Chapter 2\n')
+  })
+
+  it('should generate ffmetadata content without chapters', () => {
+    chapters = null
+
+    const result = generateFFMetadata(metadata, chapters)
+
+    expect(result).to.equal(';FFMETADATA1\ntitle=My Audiobook\nartist=John Doe\nalbum=Best Audiobooks\n')
+  })
+
+  it('should handle chapters with no title', () => {
+    chapters = [
+      { start: 0, end: 1000 },
+      { start: 1000, end: 2000 }
+    ]
+
+    const result = generateFFMetadata(metadata, chapters)
+
+    expect(result).to.equal(';FFMETADATA1\ntitle=My Audiobook\nartist=John Doe\nalbum=Best Audiobooks\n\n[CHAPTER]\nTIMEBASE=1/1000\nSTART=0\nEND=1000000\n\n[CHAPTER]\nTIMEBASE=1/1000\nSTART=1000000\nEND=2000000\n')
+  })
+
+  it('should handle metadata escaping special characters (=, ;, #,  and a newline)', () => {
+    metadata.title = 'My Audiobook; with = special # characters\n'
+    chapters[0].title = 'Chapter #1'
+
+    const result = generateFFMetadata(metadata, chapters)
+
+    expect(result).to.equal(';FFMETADATA1\ntitle=My Audiobook\\; with \\= special \\# characters\\\n\nartist=John Doe\nalbum=Best Audiobooks\n\n[CHAPTER]\nTIMEBASE=1/1000\nSTART=0\nEND=1000000\ntitle=Chapter \\#1\n\n[CHAPTER]\nTIMEBASE=1/1000\nSTART=1000000\nEND=2000000\ntitle=Chapter 2\n')
+  })
+})
+
+describe('addCoverAndMetadataToFile', () => {
+  function createTestSetup() {
+    const audioFilePath = '/path/to/audio/file.mp3'
+    const coverFilePath = '/path/to/cover/image.jpg'
+    const metadataFilePath = '/path/to/metadata/file.txt'
+    const track = 1
+    const mimeType = 'audio/mpeg'
+
+    const ffmpegStub = new EventEmitter()
+    ffmpegStub.input = sinon.stub().returnsThis()
+    ffmpegStub.outputOptions = sinon.stub().returnsThis()
+    ffmpegStub.output = sinon.stub().returnsThis()
+    ffmpegStub.input = sinon.stub().returnsThis()
+    ffmpegStub.run = sinon.stub().callsFake(() => {
+      ffmpegStub.emit('end')
+    })
+    const fsCopyFileSyncStub = sinon.stub(fs, 'copyFileSync')
+    const fsUnlinkSyncStub = sinon.stub(fs, 'unlinkSync')
+
+    return { audioFilePath, coverFilePath, metadataFilePath, track, mimeType, ffmpegStub, fsCopyFileSyncStub, fsUnlinkSyncStub }
+  }
+
+  let audioFilePath = null
+  let coverFilePath = null
+  let metadataFilePath = null
+  let track = null
+  let mimeType = null
+  let ffmpegStub = null
+  let fsCopyFileSyncStub = null
+  let fsUnlinkSyncStub = null
+  beforeEach(() => {
+    const input = createTestSetup()
+    audioFilePath = input.audioFilePath
+    coverFilePath = input.coverFilePath
+    metadataFilePath = input.metadataFilePath
+    track = input.track
+    mimeType = input.mimeType
+    ffmpegStub = input.ffmpegStub
+    fsCopyFileSyncStub = input.fsCopyFileSyncStub
+    fsUnlinkSyncStub = input.fsUnlinkSyncStub
+  })
+
+  it('should add cover image and metadata to audio file', async () => {
+    // Act
+    const result = await addCoverAndMetadataToFile(audioFilePath, coverFilePath, metadataFilePath, track, mimeType, ffmpegStub)
+
+    // Assert
+    expect(result).to.be.true
+    expect(ffmpegStub.input.calledThrice).to.be.true
+    expect(ffmpegStub.input.getCall(0).args[0]).to.equal(audioFilePath)
+    expect(ffmpegStub.input.getCall(1).args[0]).to.equal(metadataFilePath)
+    expect(ffmpegStub.input.getCall(2).args[0]).to.equal(coverFilePath)
+
+    expect(ffmpegStub.outputOptions.callCount).to.equal(4)
+    expect(ffmpegStub.outputOptions.getCall(0).args[0]).to.deep.equal(['-map 0:a', '-map_metadata 1', '-map_metadata 0', '-map_chapters 1', '-c copy'])
+    expect(ffmpegStub.outputOptions.getCall(1).args[0]).to.deep.equal(['-metadata track=1'])
+    expect(ffmpegStub.outputOptions.getCall(2).args[0]).to.deep.equal(['-id3v2_version 3'])
+    expect(ffmpegStub.outputOptions.getCall(3).args[0]).to.deep.equal(['-map 2:v', '-disposition:v:0 attached_pic', '-metadata:s:v', 'title=Cover', '-metadata:s:v', 'comment=Cover'])
+
+    expect(ffmpegStub.output.calledOnce).to.be.true
+    expect(ffmpegStub.output.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.mp3')
+
+    expect(ffmpegStub.run.calledOnce).to.be.true
+
+    expect(fsCopyFileSyncStub.calledOnce).to.be.true
+    expect(fsCopyFileSyncStub.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.mp3')
+    expect(fsCopyFileSyncStub.firstCall.args[1]).to.equal('/path/to/audio/file.mp3')
+
+    expect(fsUnlinkSyncStub.calledOnce).to.be.true
+    expect(fsUnlinkSyncStub.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.mp3')
+
+    // Restore the stub
+    sinon.restore()
+  })
+
+  it('should handle missing cover image', async () => {
+    // Arrange
+    coverFilePath = null
+
+    // Act
+    const result = await addCoverAndMetadataToFile(audioFilePath, coverFilePath, metadataFilePath, track, mimeType, ffmpegStub)
+
+    // Assert
+    expect(result).to.be.true
+    expect(ffmpegStub.input.calledTwice).to.be.true
+    expect(ffmpegStub.input.getCall(0).args[0]).to.equal(audioFilePath)
+    expect(ffmpegStub.input.getCall(1).args[0]).to.equal(metadataFilePath)
+
+    expect(ffmpegStub.outputOptions.callCount).to.equal(4)
+    expect(ffmpegStub.outputOptions.getCall(0).args[0]).to.deep.equal(['-map 0:a', '-map_metadata 1', '-map_metadata 0', '-map_chapters 1', '-c copy'])
+    expect(ffmpegStub.outputOptions.getCall(1).args[0]).to.deep.equal(['-metadata track=1'])
+    expect(ffmpegStub.outputOptions.getCall(2).args[0]).to.deep.equal(['-id3v2_version 3'])
+    expect(ffmpegStub.outputOptions.getCall(3).args[0]).to.deep.equal(['-map 0:v?'])
+
+    expect(ffmpegStub.output.calledOnce).to.be.true
+    expect(ffmpegStub.output.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.mp3')
+
+    expect(ffmpegStub.run.calledOnce).to.be.true
+
+    expect(fsCopyFileSyncStub.calledOnce).to.be.true
+    expect(fsCopyFileSyncStub.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.mp3')
+    expect(fsCopyFileSyncStub.firstCall.args[1]).to.equal('/path/to/audio/file.mp3')
+
+    expect(fsUnlinkSyncStub.calledOnce).to.be.true
+    expect(fsUnlinkSyncStub.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.mp3')
+
+    // Restore the stub
+    sinon.restore()
+  })
+
+  it('should handle error during ffmpeg execution', async () => {
+    // Arrange
+    ffmpegStub.run = sinon.stub().callsFake(() => {
+      ffmpegStub.emit('error', new Error('FFmpeg error'))
+    })
+
+    // Act
+    const result = await addCoverAndMetadataToFile(audioFilePath, coverFilePath, metadataFilePath, track, mimeType, ffmpegStub)
+
+    // Assert
+    expect(result).to.be.false
+    expect(ffmpegStub.input.calledThrice).to.be.true
+    expect(ffmpegStub.input.getCall(0).args[0]).to.equal(audioFilePath)
+    expect(ffmpegStub.input.getCall(1).args[0]).to.equal(metadataFilePath)
+    expect(ffmpegStub.input.getCall(2).args[0]).to.equal(coverFilePath)
+
+    expect(ffmpegStub.outputOptions.callCount).to.equal(4)
+    expect(ffmpegStub.outputOptions.getCall(0).args[0]).to.deep.equal(['-map 0:a', '-map_metadata 1', '-map_metadata 0', '-map_chapters 1', '-c copy'])
+    expect(ffmpegStub.outputOptions.getCall(1).args[0]).to.deep.equal(['-metadata track=1'])
+    expect(ffmpegStub.outputOptions.getCall(2).args[0]).to.deep.equal(['-id3v2_version 3'])
+    expect(ffmpegStub.outputOptions.getCall(3).args[0]).to.deep.equal(['-map 2:v', '-disposition:v:0 attached_pic', '-metadata:s:v', 'title=Cover', '-metadata:s:v', 'comment=Cover'])
+
+    expect(ffmpegStub.output.calledOnce).to.be.true
+    expect(ffmpegStub.output.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.mp3')
+
+    expect(ffmpegStub.run.calledOnce).to.be.true
+
+    expect(fsCopyFileSyncStub.called).to.be.false
+
+    expect(fsUnlinkSyncStub.called).to.be.false
+
+    // Restore the stub
+    sinon.restore()
+  })
+
+  it('should handle m4b embedding', async () => {
+    // Arrange
+    mimeType = 'audio/mp4'
+    audioFilePath = '/path/to/audio/file.m4b'
+
+    // Act
+    const result = await addCoverAndMetadataToFile(audioFilePath, coverFilePath, metadataFilePath, track, mimeType, ffmpegStub)
+
+    // Assert
+    expect(result).to.be.true
+    expect(ffmpegStub.input.calledThrice).to.be.true
+    expect(ffmpegStub.input.getCall(0).args[0]).to.equal(audioFilePath)
+    expect(ffmpegStub.input.getCall(1).args[0]).to.equal(metadataFilePath)
+    expect(ffmpegStub.input.getCall(2).args[0]).to.equal(coverFilePath)
+
+    expect(ffmpegStub.outputOptions.callCount).to.equal(4)
+    expect(ffmpegStub.outputOptions.getCall(0).args[0]).to.deep.equal(['-map 0:a', '-map_metadata 1', '-map_metadata 0', '-map_chapters 1', '-c copy'])
+    expect(ffmpegStub.outputOptions.getCall(1).args[0]).to.deep.equal(['-metadata track=1'])
+    expect(ffmpegStub.outputOptions.getCall(2).args[0]).to.deep.equal(['-f mp4'])
+    expect(ffmpegStub.outputOptions.getCall(3).args[0]).to.deep.equal(['-map 2:v', '-disposition:v:0 attached_pic', '-metadata:s:v', 'title=Cover', '-metadata:s:v', 'comment=Cover'])
+
+    expect(ffmpegStub.output.calledOnce).to.be.true
+    expect(ffmpegStub.output.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.m4b')
+
+    expect(ffmpegStub.run.calledOnce).to.be.true
+
+    expect(fsCopyFileSyncStub.calledOnce).to.be.true
+    expect(fsCopyFileSyncStub.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.m4b')
+    expect(fsCopyFileSyncStub.firstCall.args[1]).to.equal('/path/to/audio/file.m4b')
+
+    expect(fsUnlinkSyncStub.calledOnce).to.be.true
+    expect(fsUnlinkSyncStub.firstCall.args[0]).to.equal('/path/to/audio/file.tmp.m4b')
+
+    // Restore the stub
+    sinon.restore()
+  })
+})