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• FFMpeg C# wrapper "MediaToolkit 1.0.4.11". How can I do a conversion in memory ?

  8 décembre 2016, par Quantum_Kernel

  I am currently using the MediaToolkit 1.0.4.11 C# wrapper for FFMPEG to extract wav audio from a range of video files.

  Instead of creating a wav file on disk, I would like to create it in memory (as a MemoryStream). This will save me from creating temp files which I need to delete and should speed up the various analyses that I am doing on the audio data.

  Because of the way the call to the library works, I’m not sure how to ’trick’ it into doing this. Is there a way to do it or will I have to obtain and edit the wrapper source code ?

  Here is what I have for doing the conversion on disk :

  var inputFile = new MediaToolkit.Model.MediaFile { Filename = mediaFilePath };
  
              var outputFile = new MediaToolkit.Model.MediaFile { Filename = @"C:\Temp\audio.wav" };
  
  
  
              var conversionOptions = new MediaToolkit.Options.ConversionOptions
  
              {
  
                  MaxVideoDuration = TimeSpan.FromSeconds(30),
  
                  VideoAspectRatio = MediaToolkit.Options.VideoAspectRatio.R16_9,
  
                  VideoSize = MediaToolkit.Options.VideoSize.Hd1080,
  
                  AudioSampleRate = MediaToolkit.Options.AudioSampleRate.Hz48000
  
              };
  
  
  
              using (var engine = new Engine())
  
              {
  
                  engine.Convert(inputFile, outputFile, conversionOptions);
  
              }

• Create a "metadata.json" file while saving [MMPEG]

  21 mai 2022, par Emre7

  I am using youtube-dl. I want to create the metadata data of a file while saving, but the JSON file returns empty.

  


  I can get data with —write-info-json but need detailed metadata, like this.

  


  Sample command :

  


  ffprobe -loglevel 0 -print_format json -show_format -show_streams /var/../test.mp4.part > /var/../metadata.json

  


  What could be the reason for this and is there a different way ?

  


• FFmpeg : "filter_complex" results in worse quality than "vf"

  16 novembre 2016, par Dasmowenator

  I’m trying to use FFmpeg to do some complex video transcoding (such as concatenating multiple files). To do this, I’ve been trying to use the filter_complex, but I’ve noticed a slight drop in quality from what I saw earlier using the normal video filter.

  To double-check, I boiled down my command to a simple transcode — one using filter_complex and one just using the vf — and I’ve confirmed that the output of the complex filter is noticeably blurry compared to the output of the normal video filter. I can’t find any FFmpeg documentation explaining this... does anyone know why this is happening and how I can get filter_complex to output the same quality video as vf ?

  Command using the normal video filter (vf) :

  ffmpeg -i input.ts -map_chapters -1 -f mpegts -an -sn -map 0:0 -vf "[in]yadif=deint=interlaced[out]" -vcodec libx264 -profile:v baseline -level 2 -b:v 800k output.ts

  FFmpeg Output :

  ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.1.2 (GCC) 20070626 (Red Hat 4.1.2-14)
  
    configuration: --enable-gpl --enable-nonfree --enable-libx264 --enable-libfdk-aac --enable-libfaac --enable-libvpx --enable-encoder=vorbis --enable-libvorbis --enable-libmp3lame --enable-libspeex --disable-decoder=prores --disable-decoder=prores_lgpl --disable-ffplay --disable-ffserver --disable-shared --enable-static --extra-cflags=-I/local/build/include --extra-libs=-lfdk-aac --extra-ldflags=-L/local/build/lib --prefix=/local/build/install
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip01.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.41.100
  
    Duration: 00:00:10.02, start: 0.023220, bitrate: 741 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 604 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [libx264 @ 0x138a99e0] No 608/708 caption insertion into sei user data.
  
  [libx264 @ 0x138a99e0] using SAR=1/1
  
  [libx264 @ 0x138a99e0] frame MB size (54x30) > level limit (396)
  
  [libx264 @ 0x138a99e0] MB rate (48600) > level limit (11880)
  
  [libx264 @ 0x138a99e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
  
  [libx264 @ 0x138a99e0] profile Constrained Baseline, level 2.0
  
  Output #0, mpegts, to 'output.ts':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.25.100
  
      Stream #0:0(und): Video: h264 (libx264), yuv420p, 854x480 [SAR 1:1 DAR 427:240], q=-1--1, 800 kb/s, 30 fps, 90k tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.24.102 libx264
  
      Side data:
  
        unknown side data type 10 (24 bytes)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=  300 fps=179 q=-1.0 Lsize=    1059kB time=00:00:10.03 bitrate= 864.9kbits/s speed=   6x    
  
  video:949kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.660099%
  
  [libx264 @ 0x138a99e0] frame I:2     Avg QP:23.16  size: 26978
  
  [libx264 @ 0x138a99e0] frame P:298   Avg QP:23.09  size:  3079
  
  [libx264 @ 0x138a99e0] mb I  I16..4: 44.3%  0.0% 55.7%
  
  [libx264 @ 0x138a99e0] mb P  I16..4:  1.1%  0.0%  0.5%  P16..4: 28.7%  8.4%  2.1%  0.0%  0.0%    skip:59.3%
  
  [libx264 @ 0x138a99e0] final ratefactor: 22.63
  
  [libx264 @ 0x138a99e0] coded y,uvDC,uvAC intra: 30.8% 62.8% 23.0% inter: 7.2% 14.8% 0.3%
  
  [libx264 @ 0x138a99e0] i16 v,h,dc,p: 25% 39% 11% 24%
  
  [libx264 @ 0x138a99e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 29% 16%  5%  6%  7%  6%  4%  5%
  
  [libx264 @ 0x138a99e0] i8c dc,h,v,p: 45% 29% 18%  8%
  
  [libx264 @ 0x138a99e0] kb/s:777.19

  Command using the complex filter :

  ffmpeg -i input.ts -map_chapters -1 -f mpegts -filter_complex "[0:v:0]yadif=deint=interlaced[v0];[v0]concat=n=1:v=1:a=0[cat_v]" -an -sn -map "[cat_v]" -vcodec libx264 -profile:v baseline -level 2 -b:v 800k output.ts

  FFmpeg Output :

  ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.1.2 (GCC) 20070626 (Red Hat 4.1.2-14)
  
    configuration: --enable-gpl --enable-nonfree --enable-libx264 --enable-libfdk-aac --enable-libfaac --enable-libvpx --enable-encoder=vorbis --enable-libvorbis --enable-libmp3lame --enable-libspeex --disable-decoder=prores --disable-decoder=prores_lgpl --disable-ffplay --disable-ffserver --disable-shared --enable-static --extra-cflags=-I/local/build/include --extra-libs=-lfdk-aac --extra-ldflags=-L/local/build/lib --prefix=/local/build/install
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip01.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.41.100
  
    Duration: 00:00:10.02, start: 0.023220, bitrate: 741 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 604 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [libx264 @ 0x81f5200] No 608/708 caption insertion into sei user data.
  
  [libx264 @ 0x81f5200] using SAR=1/1
  
  [libx264 @ 0x81f5200] frame MB size (54x30) > level limit (396)
  
  [libx264 @ 0x81f5200] MB rate (48600) > level limit (11880)
  
  [libx264 @ 0x81f5200] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
  
  [libx264 @ 0x81f5200] profile Constrained Baseline, level 2.0
  
  Output #0, mpegts, to 'output.ts':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.25.100
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 854x480 [SAR 1:1 DAR 427:240], q=-1--1, 800 kb/s, 30 fps, 90k tbn, 30 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.24.102 libx264
  
      Side data:
  
        unknown side data type 10 (24 bytes)
  
  Stream mapping:
  
    Stream #0:0 (h264) -> yadif
  
    concat -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  frame=  300 fps=179 q=-1.0 Lsize=    1059kB time=00:00:10.03 bitrate= 864.9kbits/s speed=   6x    
  
  video:949kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.660099%
  
  [libx264 @ 0x81f5200] frame I:2     Avg QP:23.16  size: 26978
  
  [libx264 @ 0x81f5200] frame P:298   Avg QP:23.09  size:  3079
  
  [libx264 @ 0x81f5200] mb I  I16..4: 44.3%  0.0% 55.7%
  
  [libx264 @ 0x81f5200] mb P  I16..4:  1.1%  0.0%  0.5%  P16..4: 28.7%  8.4%  2.1%  0.0%  0.0%    skip:59.3%
  
  [libx264 @ 0x81f5200] final ratefactor: 22.63
  
  [libx264 @ 0x81f5200] coded y,uvDC,uvAC intra: 30.8% 62.8% 23.0% inter: 7.2% 14.8% 0.3%
  
  [libx264 @ 0x81f5200] i16 v,h,dc,p: 25% 39% 11% 24%
  
  [libx264 @ 0x81f5200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 29% 16%  5%  6%  7%  6%  4%  5%
  
  [libx264 @ 0x81f5200] i8c dc,h,v,p: 45% 29% 18%  8%
  
  [libx264 @ 0x81f5200] kb/s:777.19