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• FFMPEG & ytdl-core | Muxing highestaudio and highestvideo results in mp4 with incorrect time

  17 mars 2023, par Niek Peters

  I want to combine a file with only video and a file with only audio from the ytdl-core package into a mp4 and stream it in the response. I get the files using the highestvideo and highestaudio quality settings. I tried to modify a part of the ytdl-core-muxer module to change the output format to mp4, for which I also needed to add -movflags frag_keyframe+empty_moov, to allow the output mp4 to be seekable. This all seems to work and it produces a mp4 file without errors. When I open it with the Windows Photos app however, I noticed that even though video plays normally in perfect quality, the time is completely wrong.

  


  As you can see, the time says there are 53 million hours remaining, even though the video is 1:32 mins long

  


  I have tried adding a fixed framerate with -r 60 and regenerating the timestamps with -fflags +genpts, but to no avail. I have also tried encoding the video and audio formats to h264 (using libx264) and acc, but that didn't solve it either.

  


  


  


  // create the ffmpeg process for muxing
const ffmpegProcess = cp.spawn(
  ffmpeg,
  [
    // input audio by pipe
    "-thread_queue_size", "4096",
    "-i", "pipe:3",

    // input video by pipe
    "-thread_queue_size", "4096",
    "-r", "60",
    "-i", "pipe:4",

    // map audio and video correspondingly
    "-map", "0:a",
    "-map", "1:v",

    // change the codec
    "-c:v", "libx264", 
    "-c:a", "aac",
        
    "-preset", "ultrafast",

    // Allow output to be seekable, which is needed for mp4 output
    "-movflags", "frag_keyframe+empty_moov",

    // output mp4 and pipe
    "-r", "60",
    "-fflags", "+genpts",
    "-f", "mp4", "pipe:5",
  ],
  {
    // no popup window for Windows users
    windowsHide: true,
    stdio: [
      // silence stdin/out, forward stderr,
      "inherit", "inherit", "inherit",
      // and pipe audio, video, output
      "pipe", "pipe", "pipe",
    ],
  }
);
audioStream.pipe(ffmpegProcess.stdio[3]);
videoStream.pipe(ffmpegProcess.stdio[4]);
ffmpegProcess.stdio[5].pipe(result);

  


  


  



  Full console output :

  


  ffmpeg version 5.0.1-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers        
  built with gcc 11.2.0 (Rev7, 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. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:3':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2022-08-21T19:56:49.000000Z
  Duration: 00:01:32.11, start: 0.000000, bitrate: N/A
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 1892 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
    Metadata:
      creation_time   : 2022-08-21T19:56:49.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 08/21/2022.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)    Metadata:
      creation_time   : 2022-08-21T19:56:49.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 08/21/2022.
      vendor_id       : [0][0][0][0]
Input #1, matroska,webm, from 'pipe:4':
  Metadata:
    encoder         : google/video-file
  Duration: 00:01:32.12, start: 0.000000, bitrate: N/A
  Stream #1:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 3840x2160, SAR 1:1 DAR 16:9, 60 fps, 60 
tbr, 1k tbn (default)
Stream mapping:
  Stream #0:1 -> #0:0 (aac (native) -> aac (native))
  Stream #1:0 -> #0:1 (vp9 (native) -> h264 (libx264))
[libx264 @ 0000022aa059be80] using SAR=1/1
[libx264 @ 0000022aa059be80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2      
[libx264 @ 0000022aa059be80] profile Constrained Baseline, level 5.2, 4:2:0, 8-bit
[libx264 @ 0000022aa059be80] 264 - core 164 r3094 bfc87b7 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 
- http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to 'pipe:5':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf59.16.100
  Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)     
    Metadata:
      creation_time   : 2022-08-21T19:56:49.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 08/21/2022.
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.18.100 aac
  Stream #0:1(eng): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 60 fps, 15360 tbn (default)
    Metadata:
      encoder         : Lavc59.18.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
[matroska,webm @ 0000022aa056cd00] Thread message queue blocking; consider raising the thread_queue_size option (current value: 4096)
frame= 5527 fps= 77 q=-1.0 Lsize=  424599kB time=00:01:32.11 bitrate=37761.2kbits/s speed=1.29x    
video:423226kB audio:1329kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.010570%[aac @ 0000022aa05ca240] Qavg: 17828.035
[libx264 @ 0000022aa059be80] frame I:23    Avg QP:19.83  size:292044
[libx264 @ 0000022aa059be80] frame P:5504  Avg QP:22.92  size: 77519
[libx264 @ 0000022aa059be80] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0000022aa059be80] mb P  I16..4: 26.5%  0.0%  0.0%  P16..4: 14.1%  0.0%  0.0%  0.0%  0.0%    skip:59.3%
[libx264 @ 0000022aa059be80] coded y,uvDC,uvAC intra: 10.6% 27.6% 7.0% inter: 6.5% 12.8% 1.4%
[libx264 @ 0000022aa059be80] i16 v,h,dc,p: 57% 26%  8%  9%
[libx264 @ 0000022aa059be80] i8c dc,h,v,p: 43% 24% 25%  7%
[libx264 @ 0000022aa059be80] kb/s:37637.70


  


• Laravel ffmpeg hls encode multi-bitrate x264 error

  4 octobre 2022, par Osman Şimşek

  I wanted to encode mutliple bitrate hls using Laravel protonomedia library. When I give a single bitrate, it performs the encode operation without error, but when I want to work with mutliple bitrate, it gives an error.

  


  FFmpeg Version : 5.1.1

  


  FFmpeg Command :

  


  [2022-10-04 08:42:47] local.INFO: ffmpeg running command '/opt/ffmpeg-amd64-static/ffmpeg' '-version'  
[2022-10-04 08:42:47] local.INFO: ffmpeg executed command successfully  
[2022-10-04 08:42:47] local.INFO: ffmpeg running command '/opt/ffmpeg-amd64-static/ffmpeg' '-y' '-threads' '12' '-i' '/tmp/phpLH0wts' '-map' '0' '-vcodec' 'libx264' '-b:v' '250k' '-sc_threshold' '0' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_0_250_%05d.ts' '-master_pl_name' 'temporary_segment_playlist_0.m3u8' '-hls_key_info_file' '/tmp/78627e6a6355dc72/hls_encryption.keyinfo' '-hls_flags' 'periodic_rekey' '-acodec' 'aac' '-b:a' '128k' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_0_250.m3u8' '-map' '0' '-vcodec' 'libx264' '-b:v' '500k' '-sc_threshold' '0' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_1_500_%05d.ts' '-master_pl_name' 'temporary_segment_playlist_1.m3u8' '-hls_key_info_file' '/tmp/78627e6a6355dc72/hls_encryption.keyinfo' '-hls_flags' 'periodic_rekey' '-acodec' 'aac' '-b:a' '128k' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_1_500.m3u8' '-map' '0' '-vcodec' 'libx264' '-b:v' '1000k' '-sc_threshold' '0' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_2_1000_%05d.ts' '-master_pl_name' 'temporary_segment_playlist_2.m3u8' '-hls_key_info_file' '/tmp/78627e6a6355dc72/hls_encryption.keyinfo' '-hls_flags' 'periodic_rekey' '-acodec' 'aac' '-b:a' '128k' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_2_1000.m3u8'  
[2022-10-04 08:42:47] local.INFO: ffprobe running command '/opt/ffmpeg-amd64-static/ffprobe' '-help' '-loglevel' 'quiet'  
[2022-10-04 08:42:47] local.INFO: ffprobe executed command successfully  
[2022-10-04 08:42:47] local.INFO: ffprobe running command '/opt/ffmpeg-amd64-static/ffprobe' '/tmp/phpLH0wts' '-show_format' '-print_format' 'json'  
[2022-10-04 08:42:47] local.INFO: ffprobe executed command successfully  
[2022-10-04 08:42:47] local.ERROR: ffmpeg failed to execute command '/opt/ffmpeg-amd64-static/ffmpeg' '-y' '-threads' '12' '-i' '/tmp/phpLH0wts' '-map' '0' '-vcodec' 'libx264' '-b:v' '250k' '-sc_threshold' '0' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_0_250_%05d.ts' '-master_pl_name' 'temporary_segment_playlist_0.m3u8' '-hls_key_info_file' '/tmp/78627e6a6355dc72/hls_encryption.keyinfo' '-hls_flags' 'periodic_rekey' '-acodec' 'aac' '-b:a' '128k' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_0_250.m3u8' '-map' '0' '-vcodec' 'libx264' '-b:v' '500k' '-sc_threshold' '0' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_1_500_%05d.ts' '-master_pl_name' 'temporary_segment_playlist_1.m3u8' '-hls_key_info_file' '/tmp/78627e6a6355dc72/hls_encryption.keyinfo' '-hls_flags' 'periodic_rekey' '-acodec' 'aac' '-b:a' '128k' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_1_500.m3u8' '-map' '0' '-vcodec' 'libx264' '-b:v' '1000k' '-sc_threshold' '0' '-g' '48' '-hls_playlist_type' 'vod' '-hls_time' '10' '-hls_segment_filename' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_2_1000_%05d.ts' '-master_pl_name' 'temporary_segment_playlist_2.m3u8' '-hls_key_info_file' '/tmp/78627e6a6355dc72/hls_encryption.keyinfo' '-hls_flags' 'periodic_rekey' '-acodec' 'aac' '-b:a' '128k' '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_2_1000.m3u8': ffmpeg version N-63101-gc92edd969a-static https://johnvansickle.com/ffmpeg/  


  


  FFmpeg Error Message :

  


  Output #2, hls, to '/home/crowiaftp/public_html/yeni/public/uploads/streams/1664862167633bc7d76b09b_2_1000.m3u8':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf59.30.101
  Stream #2:0(und): Video: h264, yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 1000 kb/s, 25 fps, 90k tbn (default)
    Metadata:
      creation_time   : 2022-04-19T07:50:11.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 04/19/2022.
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.42.104 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/1000000 buffer size: 0 vbv_delay: N/A
  Stream #2:1(eng): Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2022-04-19T07:50:11.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 04/19/2022.
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.42.104 aac
frame=    0 fps=0.0 q=0.0 q=0.0 q=0.0 size=N/A time=00:00:00.41 bitrate=N/A speed=5.41x    
x264 [error]: malloc of size 3325760 failed
Error submitting video frame to the encoder
[libx264 @ 0x5a8cec0] final ratefactor: 40.36
[aac @ 0x5abc000] Qavg: 19883.271
[aac @ 0x5abc000] 2 frames left in the queue on closing
[libx264 @ 0x5b20d80] final ratefactor: 34.36
[aac @ 0x5ab7a40] Qavg: 19883.271
[aac @ 0x5ab7a40] 2 frames left in the queue on closing
[libx264 @ 0x5ab6440] final ratefactor: 28.36
[aac @ 0x5a89580] Qavg: 19883.271
[aac @ 0x5a89580] 2 frames left in the queue on closing
Conversion failed!


  


  Hls encoding code :

  


  $uniqFileName = uniqid(time());

FFMpeg::open($file)->exportForHLS()
  ->withRotatingEncryptionKey(function($fileName, $contents){
      Storage::disk('streams')->put("secrets/$fileName", $contents);
  })
  ->addFormat((new \FFMpeg\Format\Video\X264)->setKiloBitrate(250))
  ->addFormat((new \FFMpeg\Format\Video\X264)->setKiloBitrate(500))
  ->addFormat((new \FFMpeg\Format\Video\X264)->setKiloBitrate(1000))
  ->toDisk('streams')
  ->save($uniqFileName.'.m3u8');

 FFMpeg::cleanupTemporaryFiles();


  


• ffmpeg demux concat drops audio even though streams look identical

  27 septembre 2022, par Ben Olayinka

  I'm trying to demux two videos, but I'm getting an error and the audio from the second video is lost. Here's the ffprobe outputs

  


  video 1 :

  


  ffprobe bumpers/intro_final.mp4
ffprobe version 5.1.2 Copyright (c) 2007-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.102)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --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-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bumpers/intro_final.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.27.100
  Duration: 00:00:10.05, start: 0.000000, bitrate: 795 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 654 kb/s, 25 fps, 25 tbr, 25 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.37.100 libx264
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 135 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]



  


  video 2 :

  


  ffprobe input/ORIGINAL.mp4 
ffprobe version 5.1.2 Copyright (c) 2007-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.102)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --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-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input/ORIGINAL.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: iso4avc1isom
    creation_time   : 2022-09-22T09:39:50.000000Z
    com.apple.proapps.clipID: ThingsConference_ST2_01 6
    com.blackmagic-design.camera.dateRecorded: 2022:09:22
    com.apple.proapps.cameraName: 0
    com.blackmagic-design.camera.uuid: 92162B194AF84F1D8F186FBFEC9EDA9F-0
  Duration: 00:17:34.00, start: 0.000000, bitrate: 30012 kb/s
  Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 29880 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn (default)
    Metadata:
      creation_time   : 2022-09-22T09:39:50.000000Z
      handler_name    : ?Apple Video Media Handler
      vendor_id       : BMAG
      encoder         : H264/AVC
      timecode        : 11:39:50:00
  Stream #0:1[0x2](eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2022-09-22T09:39:50.000000Z
      handler_name    : ?Time Code Media Handler
      timecode        : 11:39:50:00
  Stream #0:2[0x3](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2022-09-22T09:39:50.000000Z
      handler_name    : ?Apple Sound Media Handler
      vendor_id       : [0][0][0][0]
      timecode        : 11:39:50:00
Unsupported codec with id 0 for input stream 1


  


  And I'm running

  


  ffmpeg -f concat -safe 0 -i mylist.txt -c copy output-demux.mp4


  


  Which returns

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x13ef058c0] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'mylist.txt':
  Duration: N/A, start: -0.021333, bitrate: 789 kb/s
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 654 kb/s, 25 fps, 25 tbr, 25 tbn
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.37.100 libx264
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 135 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
File 'output-demux.mp4' already exists. Overwrite? [y/N] y
Output #0, mp4, to 'output-demux.mp4':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, q=2-31, 654 kb/s, 25 fps, 25 tbr, 12800 tbn
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.37.100 libx264
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 135 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=-1.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x13ee06b10] Auto-inserting h264_mp4toannexb bitstream filter
[mp4 @ 0x13ee10a90] Non-monotonous DTS in output stream 0:1; previous: 482304, current: 1275; changing to 482305. This may result in incorrect timestamps in the output file.
[concat @ 0x13ef05200] New audio stream 0:2 at pos:792252 and DTS:10.0053s
frame= 2963 fps=0.0 q=-1.0 size=  336384kB time=00:01:58.52 bitrate=23250.6kbitsframe= 5465 fps=5464 q=-1.0 size=  695552kB time=00:03:38.60 bitrate=26065.7kbitframe= 8609 fps=5738 q=-1.0 size= 1033728kB time=00:05:44.36 bitrate=24591.4kbitframe=10978 fps=5488 q=-1.0 size= 1353984kB time=00:07:19.12 bitrate=25259.2kbitframe=13365 fps=5345 q=-1.0 size= 1715968kB time=00:08:54.60 bitrate=26294.8kbitframe=16480 fps=5492 q=-1.0 size= 2077952kB time=00:10:59.20 bitrate=25823.1kbitframe=18595 fps=5311 q=-1.0 size= 2436608kB time=00:12:23.80 bitrate=26836.1kbitframe=20753 fps=5187 q=-1.0 size= 2787072kB time=00:13:50.12 bitrate=27504.1kbitframe=22825 fps=5068 q=-1.0 size= 3157504kB time=00:15:13.00 bitrate=28331.1kbitframe=24700 fps=4935 q=-1.0 size= 3497216kB time=00:16:28.00 bitrate=28997.2kbitframe=26601 fps=4859 q=-1.0 Lsize= 3845642kB time=00:17:44.04 bitrate=29607.4kbits/s speed= 194x    
video:3845343kB audio:166kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.003468%


  


  I just noticed the "Unsupported codec" error for video 2, but I've tried concating video 1 with itself and video 2 with itself and both work fine.