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• ffmpeg amix filter on mp3 with image

  20 novembre 2018, par cutoffurmind

  I use ffmpeg to concatenate 2 mp3 files with amix filter (see full log).

  It works fine for mp3 files without any meta but it fails with mp3 files with cover image in meta, result file length is less then 1 second.

  How could I fix it in same command ?

  Here is full log :

  localhost:Music user$ ffmpeg -i input.mp3 -i /opt/docker/tag_long.mp3 -filter_complex amix=inputs=2:duration=shortest,volume=2 -codec:a libmp3lame -q:a 5  out.mp3 -report
  
  ffmpeg started on 2018-11-11 at 13:19:50
  
  Report written to "ffmpeg-20181111-131950.log"
  
  ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-opencl --enable-videotoolbox
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [mp3 @ 0x7fe506000000] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'input.mp3':
  
    Metadata:
  
      artist          : Paul
  
      album           : Underground Vol. 17
  
      title           : Crazy
  
      track           : 11/20
  
      date            : 2017
  
    Duration: 00:04:46.23, start: 0.000000, bitrate: 324 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
  
      Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 500x500 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        comment         : Cover (front)
  
  [mp3 @ 0x7fe50601aa00] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, mp3, from '/opt/docker/tag_long.mp3':
  
    Metadata:
  
      genre           : Blues
  
      id3v2_priv.XMP  : &lt;?xpacket begin="\xef\xbb\xbf" id="W5M0MpCehiHzreSzNTczkc9d"?>\x0a\x0a \x0a  <rdf 128="128" kb="kb"></rdf>s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
  
  File 'out.mp3' already exists. Overwrite ? [y/N] Y
  
  Stream mapping:
  
    Stream #0:0 (mp3float) -> amix:input0 (graph 0)
  
    Stream #1:0 (mp3float) -> amix:input1 (graph 0)
  
    volume (graph 0) -> Stream #0:0 (libmp3lame)
  
    Stream #0:1 -> #0:1 (mjpeg (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0x7fe506045000] deprecated pixel format used, make sure you did set range correctly
  
  [mp3 @ 0x7fe507810000] Frame rate very high for a muxer not efficiently supporting it.
  
  Please consider specifying a lower framerate, a different muxer or -vsync 2
  
  Output #0, mp3, to 'out.mp3':
  
    Metadata:
  
      TPE1            : Paul
  
      TALB            : Underground Vol. 17
  
      TIT2            : Crazy
  
      TRCK            : 11/20
  
      TDRC            : 2017
  
      TSSE            : Lavf58.20.100
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libmp3lame
  
      Stream #0:1: Video: png, rgb24(progressive), 500x500 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 90k fps, 90k tbn, 90k tbc
  
      Metadata:
  
        comment         : Cover (front)
  
        encoder         : Lavc58.35.100 png
  
  frame=    1 fps=0.0 q=-0.0 Lsize=     496kB time=00:00:00.26 bitrate=15501.4kbits/s speed=0.336x    
  
  video:495kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.084876%

• doc/developer.texi : extend and update naming conventions

  15 novembre 2022, par Anton Khirnov

  doc/developer.texi : extend and update naming conventions
  Bring it up to date with current practice, as the current text does not
  
  cover everything. Drop the reference to unprefixed exported symbols,
  
  which do not exist anymore.
  

  • [DH] doc/developer.texi

• (no accepted answer) How to merge 2 overlapping videos into one video using ffmpeg or opencv ?

  3 janvier 2021, par Muhammad Umer

  Merging two videos is easy, been answered couple of times. What I have is multiple overlapping videos. A video might have overlaps with video before it. Meaning if video 1 covers 1-5 timeline then video 2 may overlap 1, and cover 3 to 8. Merging them as is would result in 1-5|3-8, when i need 1-8 only.

  



  Videos are alphabetically sorted.

  



  My general idea of solution is...

  



  

  • grab last frame of the video

  


  • if it's first video continue

  


  • if it's not first video, ie. 2nd, search for frame saved in previous steps frame by frame

  


  • if it reaches to last frame of current video then there is no overlap continue

  


  • if it founds a frame then clip 2nd video up to that frame inclusive and then go to next frame

  


  • once all videos have been analyzed, merge them into one video.

  


  



  I need to translate this to ffmpeg commands. Or opencv if that's a better tool.

  



  If there is better way of doing that, I'm interested in that too.