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• Problem concatenating an mp4 file with an mp4 created by repeating a single image, with the same codec with ffmpeg concat demuxer

  3 février 2023, par ashay

  I have an mp4 video (of a lecture) containing two streams, video and audio. I wanted an introduction for it (title slide of the presentation that accompanied it), so I made an mp4 out of the intro image via ffmpeg -framerate 30 -i lec01_title.jpg -t 3 -c:v libx264 -pix_fmt yuvj420p -vf "scale=1920:1080" lec01_title.mp4 -f lavfi -i anullsrc -c:a aac. When I try to concat the files using the demuxer, it doesn't work. First, I try to verify that the properties (encoding, etc.) of the two videos are the same.

  


  If I run ffmpeg -i lec01.mp4, I get :

  


  ffmpeg version 5.1.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.1 --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
  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 'dcai_lec01.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : Wide
    encoder         : Lavf58.20.100
  Duration: 00:45:24.01, start: 0.000000, bitrate: 743 kb/s
  Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 96000 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 606 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]


  


  If I run ffmpeg -i lec01_title.mp4, I get :

  


  ffmpeg version 5.1.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.1 --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
  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 'dcai_lec01_title.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.27.100
  Duration: 00:00:03.00, start: 0.000000, bitrate: 150 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 12877 kb/s, 30 fps, 30 tbr, 15360 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), 44100 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]


  


  I tried to verify that the properties of the two videos match via ffprobe -select_streams a:0 -show_entries stream=codec_name,channels -of default=nw=1:nk=1 -v 0 lec01.mp4 and ffprobe -select_streams v:0 -show_entries stream=codec_name,width,height,r_frame_rate,pix_fmt -of default=nw=1:nk=1 -v 0 lec01.mp4, and they do. The first command gives me

  


  aac
2


  


  and the second command gives me

  


  h264
1920
1080
yuvj420p
30/1


  


  for both videos.

  


  Now, if I have a file called lec01.txt containing :

  


  file 'lec01_title.mp4'
file 'lec01.mp4'


  


  when I run ffmpeg -f concat -i lec01.txt -c copy output.mp4, the resulting video is of length 04:44:04 (four hours, when my two input videos were 3 seconds and 45:24 minutes respectively), and it only shows the title slide for that entire duration.

  


  Furthermore, when I run this concat command, I get the following message repeated many times : [mp4 @ 0x7f82b9013b80] Non-monotonous DTS in output stream 0:1; previous: 133290, current: 133120; changing to 133291. This may result in incorrect timestamps in the output file.

  


  I'm missing something. When I look up this error, it seems to be something related to the decoding time stamps (DTS) or presentation time stamps. Anyone know what I'm doing wrong and how to fix ? Thank you for your help !

  


  Edit :
It appears to work if I re-encode via ffmpeg -i lec01_title.mp4 -i lec01.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1[outv][outa]" -map "[outv]" -map "[outa]" output.mp4, but I'd like to avoid doing this since I have tons of videos I need to do this for.

  


• how to fix "FFmpeg cannot edit existing files in-place."-Problem in Java

  7 juillet 2019, par Suione

  I am trying to write an audio file to an existing videofile. Unfortunately I get the Logmessage, that I cannot edit existing files in-place.

  I have found some threads about the so called muxing between video and audio, but none of them could help me out really. Maybe some one of you can.
  Further this isn`t my could either. I am only the one who needs to use it, so I have to fix it.

  Thanks for your help

  String[] args = { FFMPEG_FILE.getAbsolutePath(), "-y", "-i", videoPath, "-ss", String.valueOf(-offset.toFrames() / 50.0f), "-i", audioPath, "-c", "copy", "-map", "0:v", "-map","1:a", "-bsf:v", "h264_mp4toannexb","-r", String.valueOf(project.getFramerate()), "-shortest",outputPath };
  
  
  
  ProcessBuilder pb = new ProcessBuilder(args).inheritIO();
  
  Process p = pb.start();
  
  int exit = p.waitFor();
  
  if (exit != 0) {
  
       throw new IOException("ffmpeg terminated with a failure");
  
  }

  EDIT : As someone commented outputPath was same same as videopath. So switched it to another, so this problem would not appear again. But I still have no sound in my outputvideos. I give you the LOG-information, so maybe you can read something out of it.

  INFO: start ffmpeg: [C:\Program Files\ffmpeg\bin\ffmpeg.exe, -y, -i, C:\Users\USERNAME\Desktop\Test_Workflow\1.mkv, -ss, 0.0, -i, C:\Users\USERNAME\Desktop\Test\resources/videos/P1000501.MP4\audio.ogg, -c, copy, -map, 0:v, -map, 1:a, -bsf:v, h264_mp4toannexb, -r, 25, -shortest, C:\Users\USERNAME\Desktop\Test\testoutput.mp4]
  
  ffmpeg version N-92087-gdcbd89e000 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20180813
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --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
  
    libavutil      56. 19.101 / 56. 19.101
  
    libavcodec     58. 31.102 / 58. 31.102
  
    libavformat    58. 18.104 / 58. 18.104
  
    libavdevice    58.  4.105 / 58.  4.105
  
    libavfilter     7. 33.100 /  7. 33.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, matroska,webm, from 'C:\Users\USERNAME\Desktop\Test_Workflow\1.mkv':
  
    Metadata:
  
      ENCODER         : Lavf56.4.101
  
    Duration: 00:00:04.60, start: 0.080000, bitrate: 1377 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
  
  Input #1, ogg, from 'C:\Users\USERNAME\Desktop\Test\resources/videos/P1000501.MP4\audio.ogg':
  
    Duration: 00:04:20.65, start: 0.000000, bitrate: 86 kb/s
  
      Stream #1:0(und): Audio: vorbis, 48000 Hz, stereo, fltp, 112 kb/s
  
      Metadata:
  
        CREATION_TIME   : 2018-11-09T13:20:07.000000Z
  
        LANGUAGE        : und
  
        ENCODER         : Lavc58.31.102 libvorbis
  
        MAJOR_BRAND     : mp42
  
        MINOR_VERSION   : 1
  
        COMPATIBLE_BRANDS: mp42avc1
  
  [mp4 @ 000001e67c0a00c0] track 1: codec frame size is not set
  
  Output #0, mp4, to 'C:\Users\USERNAME\Desktop\Test\testoutput.mp4':
  
    Metadata:
  
      encoder         : Lavf58.18.104
  
      Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
      Stream #0:1(und): Audio: vorbis (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 112 kb/s
  
      Metadata:
  
        CREATION_TIME   : 2018-11-09T13:20:07.000000Z
  
        LANGUAGE        : und
  
        ENCODER         : Lavc58.31.102 libvorbis
  
        MAJOR_BRAND     : mp42
  
        MINOR_VERSION   : 1
  
        COMPATIBLE_BRANDS: mp42avc1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  113 fps=0.0 q=-1.0 Lsize=     824kB time=00:00:04.41 bitrate=1530.8kbits/s speed= 634x    
  
  video:772kB audio:43kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 1.092082%

• Problem using ffmpeg in python to decode video stream to yuv stream and send to a pipe

  30 août 2019, par 瓦达所多阿萨德阿萨德

  This command works nice and fast in shell :

  ffmpeg -c:v h264_cuvid -i ./myvideo.mp4 -f null -pix-fmt yuv420p -

  It was about 13x speed or 300 frames/sec.
  Then I tried to send the yuv stream to pipe and catch it the main process using the following code in python :

  cmd = ['ffmpeg', '-c:v', 'h264_cuvid', '-i', './myvideo.mp4', '-f', 'image2pipe', '-pix_fmt', 'yuv420p', '-']
  
  p = subprocess.Popen(cmd, stdout = subprocess.PIPE, stderr=subprocess.PIPE)
  
  size_Y = int(height * width)
  
  size_UV = int(size_Y / 4)
  
  s = time.time()
  
  Y = p.stdout.read(size_Y)
  
  U = p.stdout.read(size_UV)
  
  V = p.stdout.read(size_UV)
  
  print('read time: ', time.time() - s)

  However, this took seconds to read just one yuv frame. What wronged here ? Im not sure what ffmpeg was sending into the pipe, the yuv planar frames or just the pointers to data planes ?

  the console output :

  [('Number of Frames', 61137), ('FPS', 25.0), ('Frame Shape', (1920, 1080))]
  
  --Number of Frames: 61137
  
  --FPS: 25.0
  
  --Frame Shape: (1920, 1080)
  
  cmd:  ['ffmpeg', '-c:v', 'h264_cuvid', '-i', './myvideo.mp4', '-f', 'image2pipe', '-pix_fmt', 'yuv420p', '-']
  
  read time:  5.251002073287964
  
  1/61137 (0.00%)read time:  2.290238618850708
  
  2/61137 (0.00%)read time:  1.2984871864318848
  
  3/61137 (0.00%)read time:  2.2100613117218018
  
  4/61137 (0.01%)read time:  2.3444178104400635