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• Use FFMPEG to convert MP4/AAC to MP3 without audio time getting shortened

  10 janvier 2023, par Esenkay07

  I've been struggling with extracting the audio from a couple of mp4 files I have. I have tried using all of the different answers posted previously on Stack Overflow, but each of them results in an mp3 file that's shorter than the original mp4.

  


  If anyone has any insights as to what I'm doing wrong, that'd be greatly appreciated, or at the very least why it's not this simple to convert from mp4 to mp3.

  


  I have tried copying the codec and using variable bitrate. The input video is 1:24:56, but the output audio is 1:24:46.

  


  Command : ffmpeg -i sample.mp4 -c:v copy -q:a 0 sample.mp3

  


  Output :

  


  $ffmpeg -i sample.mp4 -c:v copy -q:a 0 sample.mp3

ffmpeg version 2023-01-09-git-13d04e30d7-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.1.0 (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-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57. 43.100 / 57. 43.100
  libavcodec     59. 56.100 / 59. 56.100
  libavformat    59. 34.102 / 59. 34.102
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 53.100 /  8. 53.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sample.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 01:24:56.57, start: 0.000000, bitrate: 612 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 480 kb/s, 29.94 fps, 30 tbr, 90k tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](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 #0:1 -> #0:0 (aac (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'sample.mp3':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    TSSE            : Lavf59.34.102
  Stream #0:0(und): Audio: mp3, 44100 Hz, stereo, fltp (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.56.100 libmp3lame
size=   88336kB time=01:24:56.54 bitrate= 142.0kbits/s speed= 172x
video:0kB audio:88336kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000394%


  


• FFmpeg conform DASH to YouTube Live Stream requirements

  4 septembre 2023, par Aniol Pagès

  I'm trying to stream to YouTube using FFmpeg and DASH. I've generated the stream key and I'm successfully sending the generated files to YouTube. However, YouTube refuses the MPD manifest because it has two AdaptationSet (one for video and one for audio), and the documentation specifies that I should use only one for both video and audio

  


  I've tried to use the -adaptation_sets flag unsuccessfully, and also the -map flag.

  


  Here is one of the commands I've tried :
ffmpeg -re -i "/Users/user/Desktop/file.mp4" \        -map 0:v -map 0:a \        -use_template 1 -use_timeline 1 -window_size 5 -min_seg_duration 5000000 \        -f dash dash.mpd

  


  And with the -adaptation_sets flag :
ffmpeg -re -i "/Users/aniolpages/Desktop/2023-09-03 Taller colar filtrar assubtilar.mp4" -map 0 -map 0 -c:a aac -c:v libx264 \ -use_timeline 1 -use_template 1 \ -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" \ -f dash dash.mpd

  


  Has someone been successful to conform the manifest to YouTube requirements ?

  


  Thank you very much !

  


• Why ffmpeg hangs encoding a void audio track ?

  23 août 2023, par SkizZO

  I've googled an entire day experimenting all possible solutions, but noone had worked.
I have 2 HIK dvr (one is prehistoric vith analogic video). I've made a bash script to retrieve X seconds (as input) of the DVR stored videos (it cut seconds if video ends early) ; also record X seconds of Live view (used for saving Motion Alert in Home assistant).

  


  All works well, BUT i have some issues, and the big one is that when the video has no audio, the download hangs at 9.96 seconds for the old device, and 9.97sec for the new (damn !).

  


  Now let's look at the commands and the logs.

  


  Command : this works with cams with audio, but hangs if cam has an audio silent track ?

  


  makejob=$(ffmpeg -fflags +genpts -y -ac 1 -channel_layout mono -rtsp_transport tcp -hide_banner -loglevel info -err_detect ignore_err -i  "rtsp://$user:$dvrpasswd@$dvraddress:554/ISAPI/streaming/tracks/${camnumber}01?starttime=$starttime&endtime=$endTime" -map 0:v -map 0:a? -ar 44100 -filter:a "volume=$volume" -t $seconds -acodec aac -vcodec copy $filepathname)


  


  (A) result Cam with audio : errors too, but works recording both video and audio

  


  Downloading from DVR BeB-DVR a 7 seconds video of the CAM CAMERA-1 recorded from 2023-08-19 10:10:10
Input #0, rtsp, from 'rtsp://$user:$dvrpasswd@$dvraddress:554/ISAPI/streaming/tracks/101?starttime=20230819T101010Z&endtime=20230819T101020Z':
  Metadata:
    title           : HIK Media Server V4.32.116
    comment         : HIK Media Server Session Description : standard
  Duration: 462428:22:56.-75, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuvj420p(pc, bt709, progressive), 1920x1080, 25 fps, 25 tbr, 90k tbn, 180k tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
Output #0, mp4, to '/home/pi/hikdwn/downloaded/BeB-DVR-CAMERA-1-2023-08-19-h01010-(10s).mp4':
  Metadata:
    title           : HIK Media Server V4.32.116
    comment         : HIK Media Server Session Description : standard
    encoder         : Lavf57.56.101
    Stream #0:0: Video: h264 (Baseline) ([33][0][0][0] / 0x0021), yuvj420p(pc, bt709, progressive), 1920x1080, q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 69 kb/s
    Metadata:
      encoder         : Lavc57.64.101 aac
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
Press [q] to stop, [?] for help
[mp4 @ 0x212a9d0] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
frame=  175 fps= 33 q=-1.0 Lsize=    1708kB time=00:00:07.00 bitrate=1998.8kbits/s speed=1.34x
video:1643kB audio:60kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.350157%
[aac @ 0x212cf00] Qavg: 111.884
Download completed!


  


  (B) result Cam withouth audio (on both DVRs) : hangs before completing the download, the file saved is 0kb

  


  (B) on DVR1 (newer one) hangs

  


  Input #0, rtsp, from 'rtsp://$user:$dvrpasswd@$dvraddress:554/ISAPI/streaming/tracks/501?starttime=20230819T101010Z&endtime=20230819T101020Z':
  Metadata:
    title           : HIK Media Server V4.32.116
    comment         : HIK Media Server Session Description : standard
  Duration: 462428:23:09.-90, start: 0.020000, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, 50 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
Output #0, mp4, to '/home/pi/hikdwn/downloaded/BeB-DVR-CAMERA-5-2023-08-19-h01010-(10s).mp4':
  Metadata:
    title           : HIK Media Server V4.32.116
    comment         : HIK Media Server Session Description : standard
    encoder         : Lavf57.56.101
    Stream #0:0: Video: hevc (Main) ([35][0][0][0] / 0x0023), yuv420p(tv), 2560x1440, q=2-31, 50 fps, 25 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 69 kb/s
    Metadata:
      encoder         : Lavc57.64.101 aac
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
Press [q] to stop, [?] for help
frame=  251 fps=149 q=-1.0 size=       0kB time=00:00:09.97 bitrate=   0.0kbits/s speed=5.94x


  


  (B) on DVR2 (older) hangs with errors also

  


  Input #0, rtsp, from 'rtsp://$user:$dvrpasswd@$dvraddress:554/ISAPI/streaming/tracks/501?starttime=20230819T101010Z&endtime=20230819T101020Z':
  Metadata:
    title           : HIK Media Server V3.1.4
    comment         : HIK Media Server Session Description : standard
  Duration: 97123:37:11.-81, start: 0.240000, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuv420p(progressive), 352x288, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
Output #0, mp4, to '/home/pi/hikdwn/downloaded/HomeDVR-VIALE-2023-08-19-h01010-(10s).mp4':
  Metadata:
    title           : HIK Media Server V3.1.4
    comment         : HIK Media Server Session Description : standard
    encoder         : Lavf57.56.101
    Stream #0:0: Video: h264 (Baseline) ([33][0][0][0] / 0x0021), yuv420p(progressive), 352x288, q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 69 kb/s
    Metadata:
      encoder         : Lavc57.64.101 aac
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
Press [q] to stop, [?] for help
[mp4 @ 0x1377ce0] Non-monotonous DTS in output stream 0:0; previous: 2, current: -17998; changing to 3. This may result in incorrect timestamps in the output file.
[mp4 @ 0x1377ce0] Non-monotonous DTS in output stream 0:0; previous: 3, current: -14398; changing to 4. This may result in incorrect timestamps in the output file.
[mp4 @ 0x1377ce0] Non-monotonous DTS in output stream 0:0; previous: 4, current: -10798; changing to 5. This may result in incorrect timestamps in the output file.
[mp4 @ 0x1377ce0] Non-monotonous DTS in output stream 0:0; previous: 5, current: -7198; changing to 6. This may result in incorrect timestamps in the output file.
[mp4 @ 0x1377ce0] Non-monotonous DTS in output stream 0:0; previous: 6, current: -3600; changing to 7. This may result in incorrect timestamps in the output file.
[mp4 @ 0x1377ce0] Non-monotonous DTS in output stream 0:0; previous: 7, current: 2; changing to 8. This may result in incorrect timestamps in the output file.
frame=  256 fps= 49 q=-1.0 size=       0kB time=00:00:09.96 bitrate=   0.0kbits/s speed=1.89x


  


  I suppose it's due to the missing timestamps. Note that also when there is no audio, there is an audio track in the video. It hangs when trying to encode that void track.

  


  (i will comment with logs where no audio is recorded, it works with some errors... maybe other useful infos are there)