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• ffmpeg command working from command line but not from python subprocess.Popen

  7 novembre 2017, par Stuart Clarke

  I’m trying to run the below command from within a Python script.

  ffmpeg -y -loglevel verbose -i /var/www/Intro30.mp4 -i /var/www/temp/videoHD.mp4 -i /var/www/Credits30.mp4 -filter_complex '[0:0] [0:1] [1:0] [1:1] [2:0] [2:1] concat=n=3:v=1:a=1 [v] [a]' -map '[v]' -map '[a]' /var/www/temp/merged.mp4

  But it results in a corrupted file. This is the output.

  ffmpeg version 3.3.4-2~16.04.york0 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-version='2~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  [h264 @ 0x7f6d1ca0a7c0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/Intro30.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:02.93, start: 0.000000, bitrate: 3490 kb/s
  
      Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1920x1080 (1920x1088), 3507 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, 2 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [h264 @ 0x7f6d1ca334e0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/temp/videoHD.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:57.23, start: 0.000000, bitrate: 3087 kb/s
  
      Stream #1:0(eng): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1920x1080 (1920x1088), 2950 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [h264 @ 0x7f6d1ca307a0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/Credits30.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:14.14, start: 0.000000, bitrate: 5706 kb/s
  
      Stream #2:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1920x1080 (1920x1088), 5711 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 (h264) -> concat:in0:v0
  
    Stream #0:1 (aac) -> concat:in0:a0
  
    Stream #1:0 (h264) -> concat:in1:v0
  
    Stream #1:1 (aac) -> concat:in1:a0
  
    Stream #2:0 (h264) -> concat:in2:v0
  
    Stream #2:1 (aac) -> concat:in2:a0
  
    concat:out:v0 -> Stream #0:0 (libx264)
  
    concat:out:a0 -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [h264 @ 0x7f6d1d1210e0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  [h264 @ 0x7f6d1cc07420] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  [h264 @ 0x7f6d1cd449a0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  [graph 0 input from stream 0:0 @ 0x7f6d1d8f9400] w:1920 h:1080 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:0/1 sws_param:flags=2
  
  [graph_0_in_0_1 @ 0x7f6d1d8ef520] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
  [graph 0 input from stream 1:0 @ 0x7f6d1d1052a0] w:1920 h:1080 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:0/1 sws_param:flags=2
  
  [graph_0_in_1_1 @ 0x7f6d1d105ac0] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
  [graph 0 input from stream 2:0 @ 0x7f6d1d17fd20] w:1920 h:1080 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:0/1 sws_param:flags=2
  
  [graph_0_in_2_1 @ 0x7f6d1d109d40] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
  [libx264 @ 0x7f6d1ca9aaa0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x7f6d1ca9aaa0] profile High, level 4.0
  
  [libx264 @ 0x7f6d1ca9aaa0] 264 - core 148 r2795 aaa9aa8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=6 lookahead_threads=1 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
  
  Output #0, mp4, to '/var/www/temp/merged.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (libx264), 1 reference frame ([33][0][0][0] / 0x0021), yuv420p(progressive), 1920x1080, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.89.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, delay 1024, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc57.89.100 aac
  
  frame=   46 fps=0.0 q=0.0 size=       0kB time=00:00:01.62 bitrate=   0.0kbits/s speed=2.78x

  But when I run it from the command line it executes perfectly.

  ffmpeg version 3.3.4-2~16.04.york0 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-version='2~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  [h264 @ 0x7f6dc62417c0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/Intro30.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:02.93, start: 0.000000, bitrate: 3490 kb/s
  
      Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1920x1080 (1920x1088), 3507 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, 2 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [h264 @ 0x7f6dc626a4e0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/temp/videoHD.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:57.23, start: 0.000000, bitrate: 3087 kb/s
  
      Stream #1:0(eng): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1920x1080 (1920x1088), 2950 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [h264 @ 0x7f6dc62677a0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/Credits30.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:14.14, start: 0.000000, bitrate: 5706 kb/s
  
      Stream #2:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1920x1080 (1920x1088), 5711 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 (h264) -> concat:in0:v0
  
    Stream #0:1 (aac) -> concat:in0:a0
  
    Stream #1:0 (h264) -> concat:in1:v0
  
    Stream #1:1 (aac) -> concat:in1:a0
  
    Stream #2:0 (h264) -> concat:in2:v0
  
    Stream #2:1 (aac) -> concat:in2:a0
  
    concat:out:v0 -> Stream #0:0 (libx264)
  
    concat:out:a0 -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [h264 @ 0x7f6dc69580e0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  [h264 @ 0x7f6dc643e420] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  [h264 @ 0x7f6dc657b9a0] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  [graph 0 input from stream 0:0 @ 0x7f6dc712fda0] w:1920 h:1080 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:0/1 sws_param:flags=2
  
  [graph_0_in_0_1 @ 0x7f6dc693c040] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
  [graph 0 input from stream 1:0 @ 0x7f6dc693cb60] w:1920 h:1080 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:0/1 sws_param:flags=2
  
  [graph_0_in_1_1 @ 0x7f6dc69b68a0] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
  [graph 0 input from stream 2:0 @ 0x7f6dc69b74a0] w:1920 h:1080 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:0/1 sws_param:flags=2
  
  [graph_0_in_2_1 @ 0x7f6dc6941460] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
  [libx264 @ 0x7f6dc62d1aa0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x7f6dc62d1aa0] profile High, level 4.0
  
  [libx264 @ 0x7f6dc62d1aa0] 264 - core 148 r2795 aaa9aa8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=6 lookahead_threads=1 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
  
  Output #0, mp4, to '/var/www/temp/merged.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (libx264), 1 reference frame ([33][0][0][0] / 0x0021), yuv420p(progressive), 1920x1080, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.89.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, delay 1024, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc57.89.100 aac
  
  frame=   46 fps=0.0 q=0.0 size=       0kB time=00:00:01.62 bitrate=   0.0kbits/sframe=   64 fps= 59 q=29.0 size=     289kB time=00:00:02.22 bitrate=1062.4kbits/frame=   83 fps= 48 q=29.0 size=     762kB time=00:00:02.85 bitrate=2186.9kbits/[Parsed_concat_0 @ 0x7f6dc69b5ca0] EOF on in0:v0, 1 streams left in segment.
  
  [Parsed_concat_0 @ 0x7f6dc69b5ca0] EOF on in0:a0, 0 streams left in segment.
  
  [Parsed_concat_0 @ 0x7f6dc69b5ca0] Segment finished at pts=2902494
  
  frame=  104 fps= 46 q=29.0 size=     908kB time=00:00:03.55 bitrate=2094.5kbits/frame=  123 fps= 44 q=29.0 size=    1048kB time=00:00:04.17 bitrate=2053.3kbits/frame=  140 fps= 42 q=29.0 size=    1215kB time=00:00:04.76 bitrate=2091.1kbits/frame=  149 fps= 38 q=29.0 size=    1374kB time=00:00:05.06 bitrate=2223.4kbits/frame=  161 fps= 35 q=29.0 size=    1528kB time=00:00:05.45 bitrate=2293.6kbits/frame=  173 fps= 34 q=29.0 size=    1695kB time=00:00:05.82 bitrate=2382.5kbits/frame=  180 fps= 32 q=29.0 size=    1784kB time=00:00:06.08 bitrate=2402.4kbits/frame=  193 fps= 32 q=29.0 size=    1959kB time=00:00:06.50 bitrate=2468.6kbits/frame=  200 fps= 30 q=29.0 size=    2052kB time=00:00:06.75 bitrate=2487.8kbits/frame=  211 fps= 30 q=29.0 size=    2221kB time=00:00:07.12 bitrate=2552.6kbits/frame=  221 fps= 29 q=29.0 size=    2303kB time=00:00:07.45 bitrate=2530.9kbits/frame=  232 fps= 28 q=29.0 size=    2433kB time=00:00:07.82 bitrate=2547.0kbits/frame=  245 fps= 28 q=29.0 size=    2560kB time=00:00:08.26 bitrate=2536.7kbits/frame=  255 fps= 28 q=29.0 size=    2684kB time=00:00:08.59 bitrate=2558.9kbits/frame=  264 fps= 27 q=29.0 size=    2776kB time=00:00:08.89 bitrate=2557.5kbits/frame=  275 fps= 27 q=29.0 size=    2894kB time=00:00:09.26 bitrate=2559.0kbits/frame=  285 fps= 26 q=29.0 size=    3028kB time=00:00:09.58 bitrate=2586.3kbits/frame=  295 fps= 26 q=29.0 size=    3172kB time=00:00:09.91 bitrate=2621.2kbits/frame=  303 fps= 25 q=29.0 size=    3277kB time=00:00:10.19 bitrate=2633.9kbits/frame=  314 fps= 25 q=29.0 size=    3475kB time=00:00:10.56 bitrate=2694.1kbits/frame=  322 fps= 24 q=29.0 size=    3584kB time=00:00:10.82 bitrate=2713.7kbits/frame=  330 fps= 24 q=29.0 size=    3694kB time=00:00:11.09 bitrate=2726.3kbits/frame=  336 fps= 24 q=29.0 size=    3774kB time=00:00:11.30 bitrate=2733.9kbits/frame=  344 fps= 23 q=29.0 size=    3882kB time=00:00:11.56 bitrate=2750.3kbits/frame=  353 fps= 23 q=29.0 size=    4016kB time=00:00:11.86 bitrate=2772.5kbits/frame=  363 fps= 23 q=29.0 size=    4165kB time=00:00:12.19 bitrate=2798.7kbits/frame=  371 fps= 22 q=29.0 size=    4263kB time=00:00:12.46 bitrate=2800.6kbits/frame=  381 fps= 22 q=29.0 size=    4429kB time=00:00:12.79 bitrate=2835.7kbits/frame=  388 fps= 22 q=29.0 size=    4557kB time=00:00:13.02 bitrate=2865.6kbits/frame=  397 fps= 22 q=29.0 size=    4678kB time=00:00:13.32 bitrate=2875.5kbits/frame=  406 fps= 22 q=29.0 size=    4773kB time=00:00:13.63 bitrate=2868.5kbits/frame=  414 fps= 21 q=29.0 size=    4871kB time=00:00:13.88 bitrate=2873.6kbits/frame=  419 fps= 21 q=29.0 size=    4954kB time=00:00:14.04 bitrate=2888.6kbits/frame=  427 fps= 21 q=29.0 size=    5046kB time=00:00:14.32 bitrate=2885.1kbits/frame=  435 fps= 21 q=29.0 size=    5141kB time=00:00:14.58 bitrate=2888.2kbits/frame=  443 fps= 21 q=29.0 size=    5232kB time=00:00:14.86 bitrate=2884.1kbits/frame=  452 fps= 20 q=29.0 size=    5333kB time=00:00:15.16 bitrate=2881.5kbits/frame=  463 fps= 20 q=29.0 size=    5442kB time=00:00:15.53 bitrate=2869.9kbits/frame=  472 fps= 20 q=29.0 size=    5552kB time=00:00:15.81 bitrate=2876.5kbits/frame=  479 fps= 20 q=29.0 size=    5663kB time=00:00:16.06 bitrate=2887.2kbits/frame=  489 fps= 20 q=29.0 size=    5798kB time=00:00:16.39 bitrate=2897.4kbits/frame=  499 fps= 20 q=29.0 size=    5918kB time=00:00:16.71 bitrate=2899.9kbits/frame=  509 fps= 20 q=29.0 size=    6043kB time=00:00:17.06 bitrate=2900.5kbits/frame=  521 fps= 20 q=29.0 size=    6191kB time=00:00:17.46 bitrate=2904.7kbits/frame=  533 fps= 20 q=29.0 size=    6304kB time=00:00:17.85 bitrate=2892.0kbits/frame=  542 fps= 20 q=29.0 size=    6391kB time=00:00:18.15 bitrate=2883.5kbits/frame=  553 fps= 20 q=29.0 size=    6525kB time=00:00:18.52 bitrate=2884.9kbits/frame=  563 fps= 20 q=29.0 size=    6635kB time=00:00:18.85 bitrate=2882.8kbits/frame=  573 fps= 20 q=29.0 size=    6740kB time=00:00:19.17 bitrate=2878.9kbits/frame=  585 fps= 20 q=29.0 size=    6868kB time=00:00:19.59 bitrate=2870.8kbits/frame=  595 fps= 20 q=29.0 size=    6986kB time=00:00:19.92 bitrate=2872.6kbits/frame=  606 fps= 20 q=29.0 size=    7095kB time=00:00:20.29 bitrate=2864.1kbits/frame=  617 fps= 20 q=29.0 size=    7237kB time=00:00:20.66 bitrate=2868.8kbits/frame=  629 fps= 20 q=29.0 size=    7452kB time=00:00:21.06 bitrate=2898.8kbits/frame=  639 fps= 20 q=29.0 size=    7566kB time=00:00:21.38 bitrate=2898.1kbits/frame=  647 fps= 20 q=29.0 size=    7684kB time=00:00:21.66 bitrate=2905.7kbits/frame=  657 fps= 20 q=29.0 size=    7807kB time=00:00:21.98 bitrate=2908.3kbits/frame=  667 fps= 20 q=29.0 size=    7919kB time=00:00:22.31 bitrate=2907.3kbits/frame=  677 fps= 20 q=29.0 size=    8046kB time=00:00:22.66 bitrate=2908.3kbits/frame=  687 fps= 20 q=29.0 size=    8156kB time=00:00:22.98 bitrate=2906.7kbits/frame=  699 fps= 20 q=29.0 size=    8294kB time=00:00:23.38 bitrate=2905.9kbits/frame=  711 fps= 20 q=29.0 size=    8414kB time=00:00:23.80 bitrate=2896.2kbits/frame=  722 fps= 20 q=29.0 size=    8510kB time=00:00:24.14 bitrate=2887.0kbits/frame=  733 fps= 20 q=29.0 size=    8630kB time=00:00:24.52 bitrate=2883.1kbits/frame=  745 fps= 20 q=29.0 size=    8751kB time=00:00:24.91 bitrate=2877.3kbits/frame=  756 fps= 20 q=29.0 size=    8857kB time=00:00:25.28 bitrate=2869.5kbits/frame=  766 fps= 20 q=29.0 size=    8979kB time=00:00:25.63 bitrate=2869.5kbits/frame=  777 fps= 20 q=29.0 size=    9088kB time=00:00:25.98 bitrate=2865.3kbits/frame=  787 fps= 20 q=29.0 size=    9187kB time=00:00:26.33 bitrate=2858.1kbits/frame=  798 fps= 20 q=29.0 size=    9308kB time=00:00:26.67 bitrate=2858.0kbits/frame=  808 fps= 20 q=29.0 size=    9400kB time=00:00:27.02 bitrate=2849.1kbits/frame=  820 fps= 20 q=29.0 size=    9554kB time=00:00:27.42 bitrate=2854.2kbits/frame=  830 fps= 20 q=29.0 size=    9662kB time=00:00:27.74 bitrate=2852.4kbits/frame=  842 fps= 20 q=29.0 size=    9778kB time=00:00:28.16 bitrate=2843.9kbits/frame=  854 fps= 20 q=29.0 size=    9886kB time=00:00:28.56 bitrate=2835.6kbits/frame=  864 fps= 20 q=29.0 size=    9992kB time=00:00:28.88 bitrate=2833.9kbits/frame=  876 fps= 20 q=29.0 size=   10112kB time=00:00:29.28 bitrate=2829.2kbits/frame=  889 fps= 19 q=29.0 size=   21309kB time=00:00:58.00 bitrate=3009.5kbits/frame= 1750 fps= 19 q=29.0 size=   21427kB time=00:00:58.42 bitrate=3004.5kbits/frame= 1761 fps= 19 q=29.0 size=   21553kB time=00:00:58.79 bitrate=3003.1kbits/frame= 1771 fps= 19 q=29.0 size=   21669kB time=00:00:59.11 bitrate=3002.7kbits/frame= 1783 fps= 19 q=29.0 size=   21787kB time=00:00:59.51 bitrate=2999.0kbits/frame= 1793 fps= 19 q=29.0 size=   21902kB time=00:00:59.86 bitrate=2997.3kbits/[Parsed_concat_0 @ 0x7f6dc69b5ca0] EOF on in1:v0, 1 streams left in segment.
  
  [Parsed_concat_0 @ 0x7f6dc69b5ca0] EOF on in1:a0, 0 streams left in segment.
  
  [Parsed_concat_0 @ 0x7f6dc69b5ca0] Segment finished at pts=60135827
  
  frame= 1805 fps= 19 q=29.0 size=   21990kB time=00:01:00.23 bitrate=2990.7kbits/frame= 1816 fps= 19 q=29.0 size=   22117kB time=00:01:00.60 bitrate=2989.6kbits/frame= 1830 fps= 19 q=29.0 size=   bitrate=3521.1kbits/frame= 2194 fps= 19 q=29.0 size=   31450kB time=00:01:13.21 bitrate=3519.0kbits/frame= 2213 fps= 19 q=29.0 size=   31591kB time=00:01:13.83 bitrate=3504.9kbits/[Parsed_concat_0 @ 0x7f6dc69b5ca0] EOF on in2:v0, 1 streams left in segment.
  
  [Parsed_concat_0 @ 0x7f6dc69b5ca0] EOF on in2:a0, 0 streams left in segment.
  
  [Parsed_concat_0 @ 0x7f6dc69b5ca0] Segment finished at pts=74253559
  
  No more output streams to write to, finishing.
  
  frame= 2227 fps= 19 q=-1.0 Lsize=   32179kB time=00:01:14.25 bitrate=3549.9kbits/s speed=0.633x    
  
  video:31198kB audio:901kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.247438%
  
  Input file #0 (/var/www/Intro30.mp4):
  
    Input stream #0:0 (video): 87 packets read (1271526 bytes); 87 frames decoded; 
  
    Input stream #0:1 (audio): 126 packets read (773 bytes); 125 frames decoded (128000 samples); 
  
    Total: 213 packets (1272299 bytes) demuxed
  
  Input file #1 (/var/www/temp/videoHD.mp4):
  
    Input stream #1:0 (video): 1717 packets read (21108999 bytes); 1717 frames decoded; 
  
    Input stream #1:1 (audio): 2464 packets read (918725 bytes); 2463 frames decoded (2522112 samples); 
  
    Total: 4181 packets (22027724 bytes) demuxed
  
  Input file #2 (/var/www/Credits30.mp4):
  
    Input stream #2:0 (video): 423 packets read (10066322 bytes); 423 frames decoded; 
  
    Input stream #2:1 (audio): 609 packets read (3705 bytes); 608 frames decoded (622592 samples); 
  
    Total: 1032 packets (10070027 bytes) demuxed
  
  Output file #0 (/var/www/temp/merged.mp4):
  
    Output stream #0:0 (video): 2227 frames encoded; 2227 packets muxed (31946574 bytes); 
  
    Output stream #0:1 (audio): 3198 frames encoded (3274582 samples); 3199 packets muxed (923102 bytes); 
  
    Total: 5426 packets (32869676 bytes) muxed
  
  [libx264 @ 0x7f6dc62d1aa0] frame I:19    Avg QP:18.19  size:110490
  
  [libx264 @ 0x7f6dc62d1aa0] frame P:851   Avg QP:21.97  size: 23670
  
  [libx264 @ 0x7f6dc62d1aa0] frame B:1357  Avg QP:25.31  size:  7150
  
  [libx264 @ 0x7f6dc62d1aa0] consecutive B-frames:  3.1% 44.8%  6.1% 46.0%
  
  [libx264 @ 0x7f6dc62d1aa0] mb I  I16..4: 31.3% 59.2%  9.6%
  
  [libx264 @ 0x7f6dc62d1aa0] mb P  I16..4:  4.5% 11.6%  0.7%  P16..4: 40.9%  8.2%  2.5%  0.0%  0.0%    skip:31.6%
  
  [libx264 @ 0x7f6dc62d1aa0] mb B  I16..4:  0.5%  1.2%  0.2%  B16..8: 28.5%  2.0%  0.2%  direct: 1.0%  skip:66.3%  L0:42.2% L1:55.1% BI: 2.8%
  
  [libx264 @ 0x7f6dc62d1aa0] 8x8 transform intra:67.4% inter:89.6%
  
  [libx264 @ 0x7f6dc62d1aa0] coded y,uvDC,uvAC intra: 39.8% 43.5% 4.0% inter: 7.8% 12.4% 0.1%
  
  [libx264 @ 0x7f6dc62d1aa0] i16 v,h,dc,p: 25% 33% 18% 24%
  
  [libx264 @ 0x7f6dc62d1aa0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 24% 25%  3%  5%  5%  6%  4%  5%
  
  [libx264 @ 0x7f6dc62d1aa0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 30% 14%  5%  6%  5%  6%  4%  7%
  
  [libx264 @ 0x7f6dc62d1aa0] i8c dc,h,v,p: 58% 20% 17%  4%
  
  [libx264 @ 0x7f6dc62d1aa0] Weighted P-Frames: Y:0.8% UV:0.2%
  
  [libx264 @ 0x7f6dc62d1aa0] ref P L0: 73.9% 12.2% 11.3%  2.7%  0.0%
  
  [libx264 @ 0x7f6dc62d1aa0] ref B L0: 92.1%  6.8%  1.1%
  
  [libx264 @ 0x7f6dc62d1aa0] ref B L1: 98.4%  1.6%
  
  [libx264 @ 0x7f6dc62d1aa0] kb/s:3442.75
  
  [aac @ 0x7f6dc62dd100] Qavg: 18520.436

  Some lines removed to keep under the line limit.

  Here is the python method I use to execute the ffmpeg lines.

  def ffmpeg(args):
  
      err = None
  
      command = [
  
          ffmpegcmd, '-y',
  
          '-loglevel', loglevel
  
      ] + args
  
      ffmpeg = subprocess.Popen(command, stderr=subprocess.PIPE ,stdout=subprocess.PIPE, universal_newlines=True)
  
      while err == None:
  
          out, err = ffmpeg.communicate()
  
          time.sleep(1)
  
      if err:
  
          print(" ".join(command))
  
          raise Exception(err)

  *Edit

  When ever I need to use a command that requires single quotes around the arguments i.e. '[0:0] [0:1] [1:0] [1:1] [2:0] [2:1] concat=n=3:v=1:a=1 [v] [a]' the above function wouldn’t work. So I made another function for those case which deals with the command as a string. Here is is.

  def ffmpegStr(args):
  
      err = None
  
      command = [
  
          ffmpegcmd, '-y',
  
          '-loglevel', loglevel
  
      ] + args
  
      commandStr = " ".join(command)
  
      print(commandStr)
  
      ffmpeg = subprocess.Popen(shlex.split(commandStr), stderr=subprocess.PIPE ,stdout=subprocess.PIPE, universal_newlines=True)
  
      while err == None:
  
          out, err = ffmpeg.communicate()
  
          time.sleep(1)
  
      if err:
  
          print(commandStr)
  
          raise Exception(err)

  As you can see I’ve added a print to see what is being handed to the subprocess.Popen function. This is the method that is being used when the ffmpeg command does not run as expected.

  I use ffmpegcmd as a variable so that I can change the ffmpeg version if needed in both functions with 1 change.

  The args is just the list of arguments specific to what I want ffmpeg to do.

  I also like to have the option of changing the loglevel in both functions with 1 line and so use a variable for this.

  *End Edit

  Why the difference in how it is handled ?

  Cheers,

  Stu

• Fetch frame count with ffmpeg

  2 mars 2023, par Hansl

  Does anyone know how to fetch the number of total frames from a video file using ffmpeg ? The render output of ffmpeg shows the current frame and I need the frame count to calculate the progress in percent.

  


• How to stream live-video display from a webcam using FFMPEG command on tcl version 8.0 and windows 7 ?

  27 juin 2019, par M. D. P

  I am working on project were i need to have the live video streaming.
  I am able to save the video using the command :

  proc a {}  { 
  
  exec ffmpeg -f dshow -rtbufsize 64M -i "video=Integrated Webcam" -s 1280x720 -f sdl2 -
  
  }
  
  a
  
  
  
  this is the current error:

  ffmpeg started on 2017-11-17 at 15:24:45
  
  Report written to "ffmpeg-20171117-152445.log"
  
  Command line:
  
  ffmpeg -f dshow -report -rtbufsize 64M -i "video=Integrated Webcam" -s 1280x720 -f sdl2 -
  
  ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Splitting the commandline.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'dshow'.
  
  Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
  
  Reading option '-rtbufsize' ... matched as AVOption 'rtbufsize' with argument '64M'.
  
  Reading option '-i' ... matched as input url with argument 'video=Integrated Webcam'.
  
  Reading option '-s' ... matched as option 's' (set frame size (WxH or abbreviation)) with argument '1280x720'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'sdl2'.
  
  Reading option '-' ... matched as output url.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option report (generate a report) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url video=Integrated Webcam.
  
  Applying option f (force format) with argument dshow.
  
  Successfully parsed a group of options.
  
  Opening an input file: video=Integrated Webcam.
  
  [dshow @ 0000000000e06a40] Selecting pin Capture on video
  
  dshow passing through packet of type video size   614400 timestamp 5773900280000 orig timestamp 5773900274254 graph timestamp 5773900280000 diff 5746 Integrated Webcam
  
  [dshow @ 0000000000e06a40] All info found
  
  Input #0, dshow, from 'video=Integrated Webcam':
  
    Duration: N/A, start: 577390.028000, bitrate: N/A
  
      Stream #0:0, 1, 1/10000000: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
  
  Successfully opened the file.
  
  Parsing a group of options: output url -.
  
  Applying option s (set frame size (WxH or abbreviation)) with argument 1280x720.
  
  Applying option f (force format) with argument sdl2.
  
  Successfully parsed a group of options.
  
  Opening an output file: -.
  
  Successfully opened the file.
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  [rawvideo @ 0000000000d90be0] PACKET SIZE: 614400, STRIDE: 1280
  
  detected 4 logical cores
  
  dshow passing through packet of type video size   614400 timestamp 5773900600000 orig timestamp 5773900607587 graph timestamp 5773900600000 diff -7587 Integrated Webcam
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'video_size' to value '640x480'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'pix_fmt' to value '1'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'time_base' to value '1/10000000'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'pixel_aspect' to value '0/1'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'frame_rate' to value '10000000/333333'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] w:640 h:480 pixfmt:yuyv422 tb:1/10000000 fr:10000000/333333 sar:0/1 sws_param:flags=2
  
  [scaler_out_0_0 @ 0000000000d967e0] Setting 'w' to value '1280'
  
  [scaler_out_0_0 @ 0000000000d967e0] Setting 'h' to value '720'
  
  [scaler_out_0_0 @ 0000000000d967e0] Setting 'flags' to value 'bicubic'
  
  [scaler_out_0_0 @ 0000000000d967e0] w:1280 h:720 flags:'bicubic' interl:0
  
  [AVFilterGraph @ 0000000000d94d40] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
  
  [scaler_out_0_0 @ 0000000000d967e0] w:640 h:480 fmt:yuyv422 sar:0/1 -> w:1280 h:720 fmt:yuyv422 sar:0/1 flags:0x4
  
  dshow passing through packet of type video size   614400 timestamp 5773900970000 orig timestamp 5773900940920 graph timestamp 5773900970000 diff 29080 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773901240000 orig timestamp 5773901274253 graph timestamp 5773901240000 diff -34253 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773901720000 orig timestamp 5773901607586 graph timestamp 5773901720000 diff 112414 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773902040000 orig timestamp 5773901940919 graph timestamp 5773902040000 diff 99081 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773902360000 orig timestamp 5773902274252 graph timestamp 5773902360000 diff 85748 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773902680000 orig timestamp 5773902607585 graph timestamp 5773902680000 diff 72415 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773903000000 orig timestamp 5773902940918 graph timestamp 5773903000000 diff 59082 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773903320000 orig timestamp 5773903274251 graph timestamp 5773903320000 diff 45749 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773903640000 orig timestamp 5773903607584 graph timestamp 5773903640000 diff 32416 Integrated Webcam
  
  [sdl,sdl2 @ 0000000000d911c0] w:1280 h:720 fmt:yuyv422 -> w:1280 h:720
  
  Output #0, sdl,sdl2, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf57.82.101
  
      Stream #0:0, 0, 333333/10000000: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, q=2-31, 442368 kb/s, 30 fps, 30 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.106.101 rawvideo
  
  dshow passing through packet of type video size   614400 timestamp 5773903970000 orig timestamp 5773903940917 graph timestamp 5773903970000 diff 29083 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773904280000 orig timestamp 5773904274250 graph timestamp 5773904280000 diff 5750 Integrated Webcam
  
  av_interleaved_write_frame(): Operation not permitted
  
  No more output streams to write to, finishing.
  
  dshow passing through packet of type video size   614400 timestamp 5773904660000 orig timestamp 5773904607583 graph timestamp 5773904660000 diff 52417 Integrated Webcam
  
  frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A speed=0.0797x    
  
  video:1800kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Input file #0 (video=Integrated Webcam):
  
    Input stream #0:0 (video): 1 packets read (614400 bytes); 1 frames decoded; 
  
    Total: 1 packets (614400 bytes) demuxed
  
  Output file #0 (pipe:):
  
    Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (1843200 bytes); 
  
    Total: 1 packets (1843200 bytes) muxed
  
  1 frames successfully decoded, 0 decoding errors
  
  dshow passing through packet of type video size        0 timestamp 5773907070000 orig timestamp 2644601806342528 graph timestamp 5773907070000 diff -2638827899272528 Integrated Webcam
  
  Conversion failed!

  % source c:/other/a/d.tcl
  
  couldn't execute "ffmpeg -f dshow -t 00:00:10 -i {video=Integrated Webcam} -b 5000k -s 1280x720 c:\test\sample-a.avi": no such file or directory
  
  % source c:/other/a/d.tcl
  
  invalid command name "ffmpeg"
  
  % source c:/other/a/d.tcl
  
  ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, dshow, from 'video=Integrated Webcam':
  
    Duration: N/A, start: 523220.045000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, sdl,sdl2, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf57.82.101
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, q=2-31, 442368 kb/s, 30 fps, 30 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.106.101 rawvideo
  
  av_interleaved_write_frame(): Operation not permitted
  
  frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A speed=0.0471x
  
  video:1800kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Conversion failed!
  
  %

  But, the problem is i don’t want to save the video, I just want to have live video streaming.

  link : https://trac.ffmpeg.org/wiki/StreamingGuide, provide the command for live video streaming, but it want work, the webcem gets started, but live video streaming is not displayed on screen.

  so, can any one help me out to get right "FFMPEG" command or even any TCL script, to get the live video streaming displayed on on my windows 7.

  ffplay started on 2017-11-17 at 12:44:40
  
  Report written to "ffplay-20171117-124440.log"
  
  Command line:
  
  ffplay -report C:/test/sample.avi
  
  ffplay version N-87353-g183fd30 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
  [NULL @ 0000000002aea040] Opening 'C:/test/sample.avi' for reading
  
  [file @ 0000000002ae9c80] Setting default whitelist 'file,crypto'
  
  [avi @ 0000000002aea040] Format avi probed with size=2048 and score=100
  
  [avi @ 0000000002af30c0] use odml:1
  
  [avi @ 0000000002aea040] Before avformat_find_stream_info() pos: 5678 bytes read:107912 seeks:4 nb_streams:1
  
  [avi @ 0000000002aea040] All info found
  
  [avi @ 0000000002aea040] After avformat_find_stream_info() pos: 33035 bytes read:107912 seeks:4 frames:1
  
  Input #0, avi, from 'C:/test/sample.avi':
  
    Metadata:
  
      encoder         : Lavf57.82.101
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: 5072 kb/s
  
      Stream #0:0, 1, 1/30: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 5078 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
  detected 4 logical cores
  
      nan M-V:    nan fd=   0 aq=    0KB vq=  595KB sq=    0B f=0/0   
  
  Video frame changed from size:0x0 format:none serial:-1 to size:1280x720 format:yuv420p serial:1
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'video_size' to value '1280x720'
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'pix_fmt' to value '0'
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'time_base' to value '1/30'
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'pixel_aspect' to value '1/1'
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'frame_rate' to value '30/1'
  
  [ffplay_buffer @ 0000000003a17ee0] w:1280 h:720 pixfmt:yuv420p tb:1/30 fr:30/1 sar:1/1 sws_param:
  
  [AVFilterGraph @ 0000000002b14fc0] query_formats: 2 queried, 1 merged, 0 already done, 0 delayed