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• Looking for a general purpose way to merge audio and video file and make an output have stereo audio with FFmpeg

  21 février 2020, par Pineapple Joe

  So have have the following FFmpeg command

  ffmpeg -i vidab.mp4 -i recab.webm  -filter_complex "[0:a]volume=0.2,apad[A];[1:a][A]amerge[Aout]" -map 0:v -map [Aout] -y mergeab.mp4

  When the input files are played separately their audio is played equally through both headphones.

  But after being merged the audio from the video is on the right side and the audio from the webm file is on the left side.

  I see this in the output when I run the cmd

  [Parsed_amerge_2 @ 0x7fa0faf01bc0] No channel layout for input 1
  
  [Parsed_amerge_2 @ 0x7fa0faf01bc0] Input channel layouts overlap: output layout will be determined by the number of distinct input channels

  How can I adjust this so that the output file has the audio from both the inputs in equally in the left and right sides ?

  Also is there a generic way to do this such that even different configurations (video has stereo and audio has mono ... or both have stereo) result in the Audio being split evenly.

  I tried using the pan filter but there is something I am not understanding about how it works because either nothing happens or I flip left and right. But I am not getting even stereo.

  fwiw here is the full output.

  ffmpeg -i vidab.mp4 -i recab.webm  -filter_complex "[0:a]volume=0.2,apad[A];[1:a][A]amerge[Aout]" -map 0:v -map [Aout] -y mergeab.mp4
  
  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple clang version 11.0.0 (clang-1100.0.33.8)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --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. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vidab.mp4':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2020-02-21T00:35:25.000000Z
  
    Duration: 00:00:10.65, start: 0.000000, bitrate: 2539 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 96 kb/s (default)
  
      Metadata:
  
        creation_time   : 2020-02-21T00:35:25.000000Z
  
        handler_name    : Core Media Audio
  
      Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1280x640, 2436 kb/s, 29.87 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2020-02-21T00:35:25.000000Z
  
        handler_name    : Core Media Video
  
        encoder         : H.264
  
  Input #1, matroska,webm, from 'recab.webm':
  
    Metadata:
  
      encoder         : opus-media-recorder
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #1:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
  
  Stream mapping:
  
    Stream #0:0 (aac) -> volume (graph 0)
  
    Stream #1:0 (opus) -> amerge:in0 (graph 0)
  
    Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  
    amerge (graph 0) -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x7fa0fb004000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7fa0fb004000] profile High, level 3.1
  
  [libx264 @ 0x7fa0fb004000] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [Parsed_amerge_2 @ 0x7fa0faf01bc0] No channel layout for input 1
  
  [Parsed_amerge_2 @ 0x7fa0faf01bc0] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
  
  Output #0, mp4, to 'mergeab.mp4':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      encoder         : Lavf58.29.100
  
      Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1280x640, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        creation_time   : 2020-02-21T00:35:25.000000Z
  
        handler_name    : Core Media Video
  
        encoder         : Lavc58.54.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc58.54.100 aac
  
  frame=  318 fps=107 q=-1.0 Lsize=    1568kB time=00:00:17.72 bitrate= 724.8kbits/s speed=5.99x    
  
  video:1282kB audio:272kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.902630%
  
  [libx264 @ 0x7fa0fb004000] frame I:2     Avg QP:19.72  size: 51154
  
  [libx264 @ 0x7fa0fb004000] frame P:148   Avg QP:21.28  size:  6644
  
  [libx264 @ 0x7fa0fb004000] frame B:168   Avg QP:25.18  size:  1351
  
  [libx264 @ 0x7fa0fb004000] consecutive B-frames:  1.3% 84.9%  0.0% 13.8%
  
  [libx264 @ 0x7fa0fb004000] mb I  I16..4: 23.2% 49.3% 27.5%
  
  [libx264 @ 0x7fa0fb004000] mb P  I16..4:  2.1%  2.0%  0.2%  P16..4: 29.0%  5.1%  4.8%  0.0%  0.0%    skip:56.8%
  
  [libx264 @ 0x7fa0fb004000] mb B  I16..4:  0.5%  0.3%  0.0%  B16..8: 16.7%  0.8%  0.2%  direct: 6.1%  skip:75.4%  L0:24.8% L1:71.1% BI: 4.1%
  
  [libx264 @ 0x7fa0fb004000] 8x8 transform intra:45.4% inter:74.3%
  
  [libx264 @ 0x7fa0fb004000] coded y,uvDC,uvAC intra: 29.3% 51.4% 11.6% inter: 5.7% 16.6% 0.3%
  
  [libx264 @ 0x7fa0fb004000] i16 v,h,dc,p: 11% 53% 10% 26%
  
  [libx264 @ 0x7fa0fb004000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 36% 35%  2%  2%  2%  4%  2%  3%
  
  [libx264 @ 0x7fa0fb004000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 30% 12%  4%  6%  5%  7%  5%  6%
  
  [libx264 @ 0x7fa0fb004000] i8c dc,h,v,p: 47% 33% 17%  4%
  
  [libx264 @ 0x7fa0fb004000] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fa0fb004000] ref P L0: 76.6%  7.6% 11.1%  4.7%
  
  [libx264 @ 0x7fa0fb004000] ref B L0: 89.1% 10.3%  0.6%
  
  [libx264 @ 0x7fa0fb004000] ref B L1: 99.7%  0.3%
  
  [libx264 @ 0x7fa0fb004000] kb/s:989.60
  
  [aac @ 0x7fa0fb005800] Qavg: 13376.354

• Set name of matroska attachment using ffmpeg

  2 juillet 2020, par Tobias Brohl

  So when attaching files to a matroska container they get a name, normally their original name. However when you are running windows and you supply the full path to the file you want to attach, ffmpeg sets that full path as name of the attachment. How can I rename that attachment, preferably in the same command as the attachment process ?

  


• Lossless compression of a sequence of similar grayscale images

  25 octobre 2020, par damien200

  I would like to have the best compression ratio of a sequence of similar grayscale images. I note that I need an absolute lossless solution (meaning I should be able to check it with an hash algorithm).

  


  What I tried

  


  I had the idea to convert my images into a video because there is a chronology between images. The encoding algorithm would compress using the fact that not all the scene change between 2 pictures. So I tried using ffmpeg but I had several problems due to sRGB -> YUV colorspace compression. I didn't understand all the thing but it's seems like a nightmare.

  


  Example of code used :

  


  ffmpeg -i %04d.png -c:v libx265 -crf 0 video.mp4 #To convert into video
ffmpeg -i video.mp4 %04d.png #To recover images



  


  My second idea was to do it by hand with imagemagik. So I took the first image as reference and create a new image that is the difference between image1 and image2. Then I tried to add the difference image with the image 1 (trying to recover image 2) but it didn't work. Noticing the size of the recreated picture, it's clear that the image is not the same. I think there was an unwanted compression during the process.

  


  Example of code used :

  


  composite -compose difference 0001.png 0002.png diff.png #To create the diff image
composite -compose difference 0001.png diff.png recover.png #To recover image 2


  


  Do you have any idea about my problem ?
And why I don't manage to do the perfect recover with iamgemagik ?

  


  Thanks ;)

  


  Here are 20 samples images : https://cloud.damien.gdn/d/f1a7954a557441989432/