Out of bounds Memory access

[fakerName]

In some IphoneX, have that error.

[jadaradix]

This is almost certainly to do with the data arriving down the websocket. Your ffmpeg command is probably not outputting an mpeg1 stream.

Can you show us how you are running ffmpeg?
Can you reproduce this issue in desktop Chrome? (so we can figure out if iOS Safari is the problem)

[dronematt]

I'm having the same problem even when I use a v4l2-loopback from a RTMP source. This could give a very low latency playback to several devices if it could be overcome. ffmpeg -y -i test.flv -vcodec copy -vbsf h264_mp4toannexb test.h264 might hold some of the key.

[fakerName]

This is almost certainly to do with the data arriving down the websocket. Your ffmpeg command is probably not outputting an mpeg1 stream.

Can you show us how you are running ffmpeg?
Can you reproduce this issue in desktop Chrome? (so we can figure out if iOS Safari is the problem)

Can't reproduce in desktop Chrome;My ffmeg command is the default command in readme.Maybe Just in some IphoneX.

[johncoles]

I get the same issues as above on Chrome 72.0.3626.109 (Official Build) (64-bit) on macOS.

FFMPEG Command:
ffmpeg -re -stream_loop -1 -i testcard.mp4 -f mpegts http://127.0.0.1:81/mysecret

Chrome:

FFMPEG:

[jadaradix]

3038kbps bit rate is very high. Can you reproduce this at a lower bitrate?

It's good you're using the test card for consistency as we figure this out. 🙂

[phoboslab]

Try increasing the videoBufferSize for large resolutions. E.g to set 4MB (instead of the default 512kb):

var player = new JSMpeg.Player(url, {videoBufferSize: 1024*1024*4});

[marcoXbresciani]

Got the same error, even using 14MB (1024x1024x14), with Bjork's video using ffmpeg -re -i samples\bjork-all-is-full-of-love.ts -f mpegts http://localhost:8081/password as command

ffmpeg version N-93234-g2e67f751b5 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20190212
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 26.100 / 56. 26.100
  libavcodec     58. 47.102 / 58. 47.102
  libavformat    58. 26.101 / 58. 26.101
  libavdevice    58.  6.101 / 58.  6.101
  libavfilter     7. 48.100 /  7. 48.100
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
Input #0, mpegts, from 'samples\bjork-all-is-full-of-love.ts':
  Duration: 00:04:08.89, start: 1.429089, bitrate: 1664 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: mpeg1video ([2][0][0][0] / 0x0002), yuv420p(tv), 960x540 [SAR 1:1 DAR 16:9], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
    Stream #0:1[0x101](und): Audio: mp2 ([3][0][0][0] / 0x0003), 44100 Hz, mono, fltp, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg1video (native) -> mpeg2video (native))
  Stream #0:1 -> #0:1 (mp2 (native) -> mp2 (native))
Press [q] to stop, [?] for help
Output #0, mpegts, to 'http://localhost:8081/password':
  Metadata:
    encoder         : Lavf58.26.101
    Stream #0:0: Video: mpeg2video (Main), yuv420p(progressive), 960x540 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 90k tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.47.102 mpeg2video
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
    Stream #0:1(und): Audio: mp2, 44100 Hz, mono, s16, 384 kb/s
    Metadata:
      encoder         : Lavc58.47.102 mp2
frame= 1571 fps= 25 q=31.0 size=    7742kB time=00:01:02.89 bitrate=1008.4kbits/s speed=   1x

[Edassap]

@marcoXbresciani
hey, do you solve it? if so , how?

[Edassap]

OK! I solve it ! the reason of this problem is the wrong output format of stream from ffmpeg!
And I change the command (in readme file) to this :
ffmpeg -i "inputData" -f mpegts
-vcodec mpeg1video -s 960x540 -b:v 1000k -r 30 -bf 0
-codec:a mp2 -ar 44100 -ac 1 -b:a 128k
"output http stream"
hope it can also work for other guys

[haoolii]

OK! I solve it ! the reason of this problem is the wrong output format of stream from ffmpeg!
And I change the command (in readme file) to this :
ffmpeg -i "inputData" -f mpegts
-vcodec mpeg1video -s 960x540 -b:v 1000k -r 30 -bf 0
-codec:a mp2 -ar 44100 -ac 1 -b:a 128k
"output http stream"
hope it can also work for other guys

thanks for sharing!!
I solved too

[felipecrs]

In my case it works sometimes, so I guess there is nothing wrong with the feed. My stack trace is a bit different than yours though:

It either throws at MPEG1WASM.initializeWasmDecoder or at MPEG1WASM.bufferWrite. Also, videoBufferSize is already high (1024*1024*4) and video resolution is low ~360p (and it works sometimes anyway).