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• Fragmented MP4 not playing in ffplay/QuickTime/Safari, but in VLC

  6 août 2020, par Stack64

  I encoded a fMP4-Video (HEVC) in Swift using VideoToolbox and CoreMedia. The resulting fragmented MP4 is only playing in VLC.

  


  The library I am using to write the fMP4 is an HEVC-adapted version of this GitHub-Project : https://github.com/krad/morsel

  


  Process of encoding and writing :

  


  

  1. VideoToolbox : Encoding SampleBuffer from the camera (VTCompressionSession, as described in WWDC 2014 Session 513)

  


  2. Using CoreMedia-Functions (e.g. CMVideoFormatDescriptionGetHEVCParameterSetAtIndex, CMVideoFormatDescriptionGetDimensions) to get the encoded streams metadata. I am writing the content of CMFormatDescriptionGetExtension(description, extensionKey: "SampleDescriptionExtensionAtoms" as CFString)["hvcC"] directly to the hvcC box. This box is obviously written correctly, when I alter one bit of the box of the mp4, QuickTime throws an error.

  


  3. I am appending the sample buffer data to the morsel-library, which manages fragmentation and creates the moof and mdat atoms.

  


  


  The result file is playable in VLC, when I just let the playback "run" without doing anything. When I scroll the time in VLC, VLC crashes and the playback stops.

  


  It is also sort of "playable" in Safari and QuickTime (no error message shown, the playback window opens and the correct length of the file is shown, I can even change to playback time / play/pause, but there is no video shown. The window remains empty. And that is the problem I have. I need to get an fMP4 running in Safari and QuickTime.

  


  The file is not playing at all in ffplay (same problem when converting with ffmpeg). The line where the playback time is shown remains nan M-V:    nan fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0 , there are no error messages. The playback just does not start.
When playing the file with ffplay, this is the output :

  


  ffplay version 4.3 Copyright (c) 2003-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: mp41mp42isomhlsf
    creation_time   : 2020-08-03T20:41:08.000000Z
  Duration: N/A, bitrate: N/A
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv), 1920x1080, SAR 1:1 DAR 16:9, 1000000000.00 tbr, 1000000000.00 tbn, 1000000000.00 tbc (default)
    Metadata:
      creation_time   : 2020-08-03T20:41:08.000000Z
      handler_name    : video
    nan M-V:    nan fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0 


  


  My file has this structure :

  


  ftyp
moov
    mvhd
    trak
        tkhd
        mdia
            mdhd
            hdlr
            minf
                vmhd
                dinf
                    dref
                stbl
                    stsd
                    stts
                    stsc
                    stsz
                    stco
    mvex
        trex
moof-(1)
mdat
moof-(2)
mdat 
...


  


  The result file I want to create should be like the fMP4 served within this HLS playlist : (Example : https://developer.apple.com/streaming/examples/advanced-stream-hevc.html, Playlist : https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_adv_example_hevc/master.m3u8)
This file has the following structure :

  


  ftyp
moov
    mvhd
    trak
        tkhd
        mdia
            mdhd
            hdlr
            minf
                vmhd
                dinf
                    dref
                stbl
                    stsd
                    stts
                    stsc
                    stsz
                    stco
    trak (same structure as above)
    mvex
        trex
moof-(1)
mdat
moof-(2)
mdat 
...


  


  This file from Apple plays perfectly in ffmpeg and QuickTime/Safari. Except for the second trak atom, it has the same structure.

  


  The "good" file is : https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_adv_example_hevc/v14/main.mp4 (It is intended for use in a HLS Playlist I've downloaded it with curl)

  


  The "bad" file is : https://www.transfernow.net/ddl/fmp4_bad (link should work, tested it just now :) ). The video shows a slowly rotating sheet of paper.

  


  Any suggestions what the problem with my file is ?
Thanks in advance !

  


• How to remove tx3g stream from m4a file [closed]

  12 novembre 2023, par KWottrich

  I have an audiobook that I'm trying to play on my phone. My audio app of choice is struggling with the file, and I think it's because there's an additional stream in the file that it can't handle. VLC for Android plays the file without issue, but I'd rather use my audio app of choice.

  


  When I open the m4a file in VLC for Windows, I see two streams :

  


  

  


  I want to get rid of the tx3g stream, and just keep the audio stream. So I turned to ffmpeg to try to copy over only the audio stream. However, no matter what I try, the tx3g stream seems to come along for the ride. I referred to this post to figure out how to remove the tx3g stream, but so far I've been unsuccessful. Can anyone help me figure out how to remove just the tx3g track ? Ideally, I'd like to keep the metadata and album art as well.

  


  I tried to run ffmpeg -i input.m4a -map 0:a:0 -sn -dn -c copy output.m4a, but the tx3g stream is still there. Here is the command output :

  


  ffmpeg version 2021-12-06-git-ef00d40e32-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11.2.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      57. 10.101 / 57. 10.101
  libavcodec     59. 14.100 / 59. 14.100
  libavformat    59.  9.102 / 59.  9.102
  libavdevice    59.  0.101 / 59.  0.101
  libavfilter     8. 19.100 /  8. 19.100
  libswscale      6.  1.101 /  6.  1.101
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000002773b2db200] stream 0, timescale not set
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\input.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    artist          : [removed]
    title           : [removed]
    album           : [removed]
    date            : 2020
    genre           : Audiobook
    track           : 1/22
    disc            : 1/1
    comment         : [removed]
    copyright       : [removed]
    encoder         : Lavf58.29.100
  Duration: 00:01:45.14, start: 0.000000, bitrate: 132 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 105.000000
      Metadata:
        title           : [removed]
  Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Data: bin_data (text / 0x74786574), 0 kb/s
    Metadata:
      creation_time   : 2021-11-29T16:23:41.000000Z
  Stream #0:2[0x0]: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 500x500 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn (attached pic)
Output #0, ipod, to 'output.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    artist          : [removed]
    title           : [removed]
    album           : [removed]
    date            : 2020
    genre           : Audiobook
    track           : 1/22
    disc            : 1/1
    comment         : [removed]
    copyright       : [removed]
    encoder         : Lavf59.9.102
  Chapters:
    Chapter #0:0: start 0.000000, end 105.000000
      Metadata:
        title           : [removed]
  Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=    1632kB time=00:01:45.11 bitrate= 127.2kbits/s speed=1.48e+04x
video:0kB audio:1612kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.233040%


  


• How to : stream with ffmpeg and nginx rtmp, Ubuntu

  3 décembre 2020, par WurmD

  nginx installed with https://nginx.org/en/linux_packages.html in Ubuntu 18.04

  


  sudo apt -y install curl gnupg2 ca-certificates lsb-release ;
echo "deb http://nginx.org/packages/ubuntu `lsb_release -cs` nginx" | sudo tee /etc/apt/sources.list.d/nginx.list ;
curl -fsSL https://nginx.org/keys/nginx_signing.key | sudo apt-key add - ;
sudo apt update ;
sudo apt install nginx ;


  


  nginx up and running

  


  $ ps -aux | grep nginx
root      5602  0.0  0.0  33348   880 ?        Ss   17:03   0:00 nginx: master process nginx
nginx     5603  0.0  0.0  33744  2748 ?        S    17:03   0:00 nginx: worker process


  


  with /etc/nginx/nginx.conf

  


  rtmp {
    server {
        listen 1935;
        chunk_size 4096;

        application live {
            live on;
            record off;
            allow publish 127.0.0.1;
            deny publish all;
        }
    }
}


  


  ffmpeg -f lavfi -i testsrc -t 30 -pix_fmt yuv420p -f flv rtmp://localhost/live/test yields

  


  ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, lavfi, from 'testsrc':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
[tcp @ 0x5611668b8c00] Connection to tcp://localhost:1935 failed: Connection refused
[rtmp @ 0x5611668b8520] Cannot open connection tcp://localhost:1935
rtmp://localhost/live: Connection refused


  


  Clue :
Nothing seems to be listening on port 1935. netstat -tap | grep 1935 yields nothing
Clue2 :
Albeit ps shows app as running, systemctl status nginx.service shows app status down

  


  ● nginx.service - nginx - high performance web server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2020-12-03 19:37:17 CET; 7min ago
     Docs: http://nginx.org/en/docs/
  Process: 5709 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE)


  


  Things checked given other stackoverflow questions :

  


  

  • trying to connect to rtmp://localhost/live/test and in nginx.conf the application is correctly named live

  


  • nginx.conf correctly placed at /etc/nginx/, no other nginx.conf files exist, and nginx -s reload called to make sure it is loaded

  


  • no localhost instances in the conf file, all renamed to 127.0.0.1