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LC is discarding the language tag from chapters in .MKV files #991

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bigfella237 opened this issue Jan 21, 2022 · 8 comments
Closed

LC is discarding the language tag from chapters in .MKV files #991

bigfella237 opened this issue Jan 21, 2022 · 8 comments
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bug ffmpeg Problem resides in ffmpeg or usage of ffmpeg

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@bigfella237
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I'm using the latest version of LC. Here is a screenshot of the file's chapters open in MKVmerge before:

https://i.postimg.cc/3RPdg7FG/Lossless-Cut-Chapters-BEFORE.jpg

And after exporting:

https://i.postimg.cc/wvt1y3LH/Lossless-Cut-Chapters-AFTER.jpg

Lossless Cut is removing the language tags, which means I need to mux the file again to reset them. Could Lossless Cut be made to leave this tag intact (IE export the same values as were imported)?

Thanks!
@mifi
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mifi commented Feb 12, 2022

Is this cut or cut+merge? please provide some more information as explained in the template

@bigfella237
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No, just a simple trim.

I was only using the MKVmerge software to reset the MKV flags back to "eng" after using Lossless Cut.

@mifi
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mifi commented Feb 12, 2022

any chance u could share a file? I've never seen chapter language before

@bigfella237
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No problem, I just re-encoded this to a much lower resolution so it's a more manageable file size and added some chapters (set to "eng").

https://www.mediafire.com/file/zlw6lvsgrwf6qwa/Lossless_Cut_Test_File_%2528Low_Res_Re-encode%2529.mkv/file

I don't normally use the "Import Chapters" option so I'm not sure if that makes a difference, just drop it into Lossless Cut, trim any amount you like from it, then compare the chapters before and after.

Thanks

@mifi
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mifi commented Feb 12, 2022 •
edited
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Thanks. I ran ffprobe on your file, and it returns this:

[
  {
    id: 106667171,
    time_base: '1/1000000000',
    start: 0,
    start_time: '0.000000',
    end: 10000000000,
    end_time: '10.000000',
    tags: {
      title: 'Chapter 01',
    },
  },
  {
    id: -1371318106,
    time_base: '1/1000000000',
    start: 10000000000,
    start_time: '10.000000',
    end: 20000000000,
    end_time: '20.000000',
    tags: {
      title: 'Chapter 02',
    },
  },
  {
    id: -810947947,
    time_base: '1/1000000000',
    start: 20000000000,
    start_time: '20.000000',
    end: 30000000000,
    end_time: '30.000000',
    tags: {
      title: 'Chapter 03',
    },
  },
  {
    id: -2142281084,
    time_base: '1/1000000000',
    start: 30000000000,
    start_time: '30.000000',
    end: 40000000000,
    end_time: '40.000000',
    tags: {
      title: 'Chapter 04',
    },
  },
  {
    id: -1200737892,
    time_base: '1/1000000000',
    start: 40000000000,
    start_time: '40.000000',
    end: 49049000000,
    end_time: '49.049000',
    tags: {
      title: 'Chapter 05',
    },
  },
]

ffmpeg spits out:

  Chapters:
    Chapter #0:0: start 0.000000, end 10.000000
      Metadata:
        title           : Chapter 01
    Chapter #0:1: start 10.000000, end 20.000000
      Metadata:
        title           : Chapter 02
    Chapter #0:2: start 20.000000, end 30.000000
      Metadata:
        title           : Chapter 03
    Chapter #0:3: start 30.000000, end 40.000000
      Metadata:
        title           : Chapter 04
    Chapter #0:4: start 40.000000, end 49.049000
      Metadata:
        title           : Chapter 05

So there is no language detected by ffmpeg/ffprobe.

However MediaInfo seems to detect the language:


Menu
00:00:00.000                             : en:Chapter 01
00:00:10.000                             : en:Chapter 02
00:00:20.000                             : en:Chapter 03
00:00:30.000                             : en:Chapter 04
00:00:40.000                             : en:Chapter 05

Will have to look into it, but it looks like an ffmpeg issue. BTW I found this issue, possibly related: MediaArea/MediaAreaXml#34

#1027

@mifi mifi added ffmpeg Problem resides in ffmpeg or usage of ffmpeg bug labels Feb 12, 2022
@bigfella237
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If I extract the "chapters" element directly from the .MKV file and open it with Notepad++ I see:

<?xml version="1.0"?>
<!-- <!DOCTYPE Chapters SYSTEM "matroskachapters.dtd"> -->
<Chapters>
  <EditionEntry>
    <EditionFlagHidden>0</EditionFlagHidden>
    <EditionFlagDefault>0</EditionFlagDefault>
    <EditionUID>3418007036680139663</EditionUID>
    <ChapterAtom>
      <ChapterUID>12346341782649019555</ChapterUID>
      <ChapterTimeStart>00:00:00.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:10.000000000</ChapterTimeEnd>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterDisplay>
        <ChapterString>Chapter 01</ChapterString>
        <ChapterLanguage>eng</ChapterLanguage>
      </ChapterDisplay>
    </ChapterAtom>
    <ChapterAtom>
      <ChapterUID>14678830363762186406</ChapterUID>
      <ChapterTimeStart>00:00:10.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:20.000000000</ChapterTimeEnd>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterDisplay>
        <ChapterString>Chapter 02</ChapterString>
        <ChapterLanguage>eng</ChapterLanguage>
      </ChapterDisplay>
    </ChapterAtom>
    <ChapterAtom>
      <ChapterUID>17970822921537055381</ChapterUID>
      <ChapterTimeStart>00:00:20.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:30.000000000</ChapterTimeEnd>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterDisplay>
        <ChapterString>Chapter 03</ChapterString>
        <ChapterLanguage>eng</ChapterLanguage>
      </ChapterDisplay>
    </ChapterAtom>
    <ChapterAtom>
      <ChapterUID>16782836598219694724</ChapterUID>
      <ChapterTimeStart>00:00:30.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:40.000000000</ChapterTimeEnd>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterDisplay>
        <ChapterString>Chapter 04</ChapterString>
        <ChapterLanguage>eng</ChapterLanguage>
      </ChapterDisplay>
    </ChapterAtom>
    <ChapterAtom>
      <ChapterUID>433599032052298140</ChapterUID>
      <ChapterTimeStart>00:00:40.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:49.049000000</ChapterTimeEnd>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterDisplay>
        <ChapterString>Chapter 05</ChapterString>
        <ChapterLanguage>eng</ChapterLanguage>
      </ChapterDisplay>
    </ChapterAtom>
  </EditionEntry>
</Chapters>

@bigfella237
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Just to add to the above, the Language flag becomes much more important in this scenario where you might have chapters listed in multiple languages:

<?xml version="1.0"?>
<!-- <!DOCTYPE Chapters SYSTEM "matroskachapters.dtd"> -->
<Chapters>
  <EditionEntry>
    <EditionFlagHidden>0</EditionFlagHidden>
    <EditionFlagDefault>0</EditionFlagDefault>
    <EditionUID>3418007036680139663</EditionUID>
    <ChapterAtom>
      <ChapterUID>12346341782649019555</ChapterUID>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterDisplay>
        <ChapterString>Chapter 01</ChapterString>
        <ChapterLanguage>eng</ChapterLanguage>
      </ChapterDisplay>
      <ChapterTimeStart>00:00:00.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:20.000000000</ChapterTimeEnd>
    </ChapterAtom>
    <ChapterAtom>
      <ChapterUID>14678830363762186406</ChapterUID>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterDisplay>
        <ChapterString>Chapter 02</ChapterString>
        <ChapterLanguage>eng</ChapterLanguage>
      </ChapterDisplay>
      <ChapterTimeStart>00:00:20.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:49.049000000</ChapterTimeEnd>
    </ChapterAtom>
  </EditionEntry>
  <EditionEntry>
    <EditionFlagHidden>0</EditionFlagHidden>
    <EditionFlagDefault>0</EditionFlagDefault>
    <EditionUID>10881502284652382627</EditionUID>
    <ChapterAtom>
      <ChapterDisplay>
        <ChapterString>Chapitre 01</ChapterString>
        <ChapterLanguage>fre</ChapterLanguage>
      </ChapterDisplay>
      <ChapterUID>9474270449578469025</ChapterUID>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterTimeStart>00:00:00.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:20.000000000</ChapterTimeEnd>
    </ChapterAtom>
    <ChapterAtom>
      <ChapterDisplay>
        <ChapterString>Chapitre 02</ChapterString>
        <ChapterLanguage>fre</ChapterLanguage>
      </ChapterDisplay>
      <ChapterUID>6132805354353343877</ChapterUID>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterTimeStart>00:00:20.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:49.049000000</ChapterTimeEnd>
    </ChapterAtom>
  </EditionEntry>
  <EditionEntry>
    <EditionFlagHidden>0</EditionFlagHidden>
    <EditionFlagDefault>0</EditionFlagDefault>
    <EditionUID>150742582447920281</EditionUID>
    <ChapterAtom>
      <ChapterDisplay>
        <ChapterString>Kapitel 01</ChapterString>
        <ChapterLanguage>ger</ChapterLanguage>
      </ChapterDisplay>
      <ChapterUID>8567636161335515582</ChapterUID>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterTimeStart>00:00:00.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:20.000000000</ChapterTimeEnd>
    </ChapterAtom>
    <ChapterAtom>
      <ChapterDisplay>
        <ChapterString>Kapitel 02</ChapterString>
        <ChapterLanguage>ger</ChapterLanguage>
      </ChapterDisplay>
      <ChapterUID>13335010568281197443</ChapterUID>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterTimeStart>00:00:20.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:49.049000000</ChapterTimeEnd>
    </ChapterAtom>
  </EditionEntry>
  <EditionEntry>
    <EditionFlagHidden>0</EditionFlagHidden>
    <EditionFlagDefault>0</EditionFlagDefault>
    <EditionUID>16753243778213094583</EditionUID>
    <ChapterAtom>
      <ChapterDisplay>
        <ChapterString>Capítulo 01</ChapterString>
        <ChapterLanguage>spa</ChapterLanguage>
      </ChapterDisplay>
      <ChapterUID>2161846324810908801</ChapterUID>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterTimeStart>00:00:00.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:20.000000000</ChapterTimeEnd>
    </ChapterAtom>
    <ChapterAtom>
      <ChapterDisplay>
        <ChapterString>Capítulo 02</ChapterString>
        <ChapterLanguage>spa</ChapterLanguage>
      </ChapterDisplay>
      <ChapterUID>12803616733650064291</ChapterUID>
      <ChapterFlagHidden>0</ChapterFlagHidden>
      <ChapterFlagEnabled>1</ChapterFlagEnabled>
      <ChapterTimeStart>00:00:20.000000000</ChapterTimeStart>
      <ChapterTimeEnd>00:00:49.049000000</ChapterTimeEnd>
    </ChapterAtom>
  </EditionEntry>
</Chapters>

@mifi mifi mentioned this issue Aug 7, 2024
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@mifi
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mifi commented Aug 7, 2024

tracking this problem in #1027 - closing this issue to keep count down

@mifi mifi closed this as not planned Won't fix, can't repro, duplicate, stale Aug 7, 2024
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