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• 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

• How to fix ffmpeg complex filters "Invalid stream specifier" [duplicate]

  15 mai 2019, par Chase

  This question already has an answer here :

  • FFmpeg filter_complex concat gives only first input on crop
    
    1 answer
    
  • Problems building Image slideshow with sliding transition using ffmpeg
    
    1 answer
    
  • ffmpeg : chain of multiple filter_complex, re-using intermediate output stream
    
    1 answer
    

  I’m attempting to scale and blur (sections of) a video with ffmpeg complex filters. This has actually been working in production for years.

  I’m now running a newer build of ffmpeg on Ubuntu 18.04 and getting an error relating to the filters where the same command works fine on Ubuntu 16.04’s ffmpeg against the same video.

  
  Specifically, I’m seeing the following error :

  mov,mp4,m4a,3gp,3g2,mj2 @ 0x56055a5902c0] Invalid stream specifier: vs0.
  
      Last message repeated 1 times
  
  Stream specifier 'vs0' in filtergraph description ... matches no streams.

  Has something about the complex filter API changed that would make this same input invalid in a newer version of ffmpeg ?

  ---

  The command in question is just running the following in a Bash terminal.

  ffmpeg -ss 60 -i ~/test.mp4 -y -filter_complex "[0:v]scale=-2:'min(320,ih)'[vs0];[vs0]crop=in_w/9:in_h/2:0:0,boxblur=5:1:cr=3:ar=3[b0];[vs0]crop=in_w/9:in_h/2:in_w-out_w:0,boxblur=5:1:cr=3:ar=3[b1];[vs0]crop=(in_w-2*in_w/9):in_h/20:in_w/9:0,boxblur=5:1:cr=3:ar=3[b2];[vs0][b0]overlay=0:0[ovr0];[ovr0][b1]overlay=main_w-overlay_w:0[ovr1];[ovr1][b2]overlay=main_w/9:0[vs1]" -map [vs1] -an -ac 2 -b:a 128k -acodec aac -b:v 1024k -r 30 -vcodec libx264 -t 300 -y -preset slow -movflags faststart -pix_fmt yuv420p -f mp4 ~/out.mp4

  If we break up the complex filter statement, it looks like :

  [0:v]scale=-2:'min(320,ih)'[vs0];
  
  [vs0]crop=in_w/9:in_h/2:0:0,boxblur=5:1:cr=3:ar=3[b0];
  
  [vs0]crop=in_w/9:in_h/2:in_w-out_w:0,boxblur=5:1:cr=3:ar=3[b1];
  
  [vs0]crop=(in_w-2*in_w/9):in_h/20:in_w/9:0,boxblur=5:1:cr=3:ar=3[b2];
  
  [vs0][b0]overlay=0:0[ovr0];[ovr0][b1]overlay=main_w-overlay_w:0[ovr1];
  
  [ovr1][b2]overlay=main_w/9:0[vs1]

  ---

  On ffmpeg version N-86980-g62b7553 (Ubuntu 16.04), everything works great as it has done for years.

  $ ffmpeg -ss 60 -i ~/test.mp4 -y -filter_complex "[0:v]scale=-2:'min(320,ih)'[vs0];[vs0]crop=in_w/9:in_h/2:0:0,boxblur=5:1:cr=3:ar=3[b0];[vs0]crop=in_w/9:in_h/2:in_w-out_w:0,boxblur=5:1:cr=3:ar=3[b1];[vs0]crop=(in_w-2*in_w/9):in_h/20:in_w/9:0,boxblur=5:1:cr=3:ar=3[b2];[vs0][b0]overlay=0:0[ovr0];[ovr0][b1]overlay=main_w-overlay_w:0[ovr1];[ovr1][b2]overlay=main_w/9:0[vs1]" -map [vs1] -an -ac 2 -b:a 128k -acodec aac -b:v 1024k -r 30 -vcodec libx264 -t 300 -y -preset slow -movflags faststart -pix_fmt yuv420p -f mp4 ~/out.mp4
  
  ffmpeg version N-86980-g62b7553 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-openssl --enable-nonfree
  
    libavutil      55. 73.100 / 55. 73.100
  
    libavcodec     57.102.100 / 57.102.100
  
    libavformat    57. 76.100 / 57. 76.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 98.100 /  6. 98.100
  
    libswscale      4.  7.102 /  4.  7.102
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/cmaier/test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.76.100
  
    Duration: 00:10:00.00, start: 0.000000, bitrate: 1036 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 768x480, 1033 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 (h264) -> scale
  
    Stream #0:0 (h264) -> crop
  
    Stream #0:0 (h264) -> crop
  
    Stream #0:0 (h264) -> overlay:main
  
    overlay -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x27b2ca0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x27b2ca0] profile High, level 3.1
  
  [libx264 @ 0x27b2ca0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 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=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=abr mbtree=1 bitrate=1024 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/home/cmaier/out.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.76.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 768x480, q=-1--1, 1024 kb/s, 30 fps, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.102.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/1024000 buffer size: 0 vbv_delay: -1
  
  [mp4 @ 0x27b5a60] Starting second pass: moving the moov atom to the beginning of the file3.9x    
  
  frame= 9000 fps=117 q=-1.0 Lsize=   37827kB time=00:04:59.90 bitrate=1033.3kbits/s speed= 3.9x    
  
  video:37721kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.282333%
  
  [libx264 @ 0x27b2ca0] frame I:36    Avg QP:15.21  size: 50944
  
  [libx264 @ 0x27b2ca0] frame P:2723  Avg QP:20.12  size:  9593
  
  [libx264 @ 0x27b2ca0] frame B:6241  Avg QP:24.23  size:  1710
  
  [libx264 @ 0x27b2ca0] consecutive B-frames:  3.6%  6.9% 14.5% 75.0%
  
  [libx264 @ 0x27b2ca0] mb I  I16..4: 17.3% 58.5% 24.2%
  
  [libx264 @ 0x27b2ca0] mb P  I16..4:  0.5%  4.4%  0.9%  P16..4: 31.1% 20.7% 12.1%  0.0%  0.0%    skip:30.3%
  
  [libx264 @ 0x27b2ca0] mb B  I16..4:  0.0%  0.3%  0.1%  B16..8: 28.9%  5.5%  1.1%  direct: 1.1%  skip:63.1%  L0:37.5% L1:52.6% BI: 9.9%
  
  [libx264 @ 0x27b2ca0] final ratefactor: 19.69
  
  [libx264 @ 0x27b2ca0] 8x8 transform intra:72.8% inter:68.3%
  
  [libx264 @ 0x27b2ca0] direct mvs  spatial:99.9% temporal:0.1%
  
  [libx264 @ 0x27b2ca0] coded y,uvDC,uvAC intra: 74.5% 73.0% 30.4% inter: 13.0% 10.7% 0.2%
  
  [libx264 @ 0x27b2ca0] i16 v,h,dc,p: 49% 30%  3% 17%
  
  [libx264 @ 0x27b2ca0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 14% 11%  7% 11%  8% 19%  8% 15%
  
  [libx264 @ 0x27b2ca0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  9% 13%  5%  8% 14% 10% 17%  9% 16%
  
  [libx264 @ 0x27b2ca0] i8c dc,h,v,p: 42% 29% 15% 15%
  
  [libx264 @ 0x27b2ca0] Weighted P-Frames: Y:7.4% UV:2.9%
  
  [libx264 @ 0x27b2ca0] ref P L0: 59.2% 20.2% 11.5%  3.7%  4.3%  1.0%  0.1%
  
  [libx264 @ 0x27b2ca0] ref B L0: 87.5%  8.8%  2.7%  1.0%
  
  [libx264 @ 0x27b2ca0] ref B L1: 96.5%  3.5%
  
  [libx264 @ 0x27b2ca0] kb/s:1030.01

  ---

  On ffmpeg version N-93862-gf49cec2 (Ubuntu 18.04), the command fails immediately.

  # ffmpeg -ss 60 -i ~/test.mp4 -y -filter_complex "[0:v]scale=-2:'min(320,ih)'[vs0];[vs0]crop=in_w/9:in_h/2:0:0,boxblur=5:1:cr=3:ar=3[b0];[vs0]crop=in_w/9:in_h/2:in_w-out_w:0,boxblur=5:1:cr=3:ar=3[b1];[vs0]crop=(in_w-2*in_w/9):in_h/20:in_w/9:0,boxblur=5:1:cr=3:ar=3[b2];[vs0][b0]overlay=0:0[ovr0];[ovr0][b1]overlay=main_w-overlay_w:0[ovr1];[ovr1][b2]overlay=main_w/9:0[vs1]" -map [vs1] -an -ac 2 -b:a 128k -acodec aac -b:v 1024k -r 30 -vcodec libx264 -t 300 -y -preset slow -movflags faststart -pix_fmt yuv420p -f mp4 ~/out.mp4
  
  ffmpeg version N-93862-gf49cec2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04)
  
    configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-openssl --enable-nonfree
  
    libavutil      56. 27.100 / 56. 27.100
  
    libavcodec     58. 52.101 / 58. 52.101
  
    libavformat    58. 27.103 / 58. 27.103
  
    libavdevice    58.  7.100 / 58.  7.100
  
    libavfilter     7. 53.100 /  7. 53.100
  
    libswscale      5.  4.101 /  5.  4.101
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/root/test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.76.100
  
    Duration: 00:10:00.00, start: 0.000000, bitrate: 1036 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 768x480, 1033 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x56055a5902c0] Invalid stream specifier: vs0.
  
      Last message repeated 1 times
  
  Stream specifier 'vs0' in filtergraph description [0:v]scale=-2:'min(320,ih)'[vs0];[vs0]crop=in_w/9:in_h/2:0:0,boxblur=5:1:cr=3:ar=3[b0];[vs0]crop=in_w/9:in_h/2:in_w-out_w:0,boxblur=5:1:cr=3:ar=3[b1];[vs0]crop=(in_w-2*in_w/9):in_h/20:in_w/9:0,boxblur=5:1:cr=3:ar=3[b2];[vs0][b0]overlay=0:0[ovr0];[ovr0][b1]overlay=main_w-overlay_w:0[ovr1];[ovr1][b2]overlay=main_w/9:0[vs1] matches no streams.

• 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);
  
              }