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• h.264 lossless video in python with ffmpeg

  7 mars 2015, par Ojtwist

  I have raw video files which I encoded via ffmpeg (lossless) :

  ffmpeg -i test.avi -c:v libx264 -preset veryslow -crf 0 output.mkv

  Now I tried to read these in python :

      FFMPEG_BIN = "ffmpeg"
  
  
  
      command = [FFMPEG_BIN,
  
                     '-i',path,
  
                     '-f', 'image2pipe',
  
                     '-pix_fmt','yuv444p',
  
                     '-r',framerate,
  
                     '-ss',startposition,
  
                     '-vcodec','rawvideo','-']
  
  
  
      pipe = sp.Popen(command,stdout=sp.PIPE,bufsize=10**8)
  
  
  
      while True:
  
          raw_image = pipe.stdout.read(640*480*3)
  
  
  
          image = np.fromstring(raw_image,dtype='uint8')
  
  
  
          image = image.reshape((480,640,3))

  I can’t find the good command to get the video lossless in python. If I try it as mentioned above and show it with matplotlib, I get :
  

  If I set -vcodec to libx264 I get noise.

  

  If i set -pix_fmt to rgb24, I get a normal looking image, but I can see some artifact due to the color conversion.

  What is the command I am looking for ?

  ---

  extra info, the output of the encoding (initial raw video ==> lossless h.264) :

  worker@worklati:~/data/DMG/test$ ffmpeg -i test.avi -c:v libx264 -preset veryslow -crf 0 output.mkv
  
  ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
  
    built on Jan 11 2015 17:53:45 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, avi, from 'test.avi':
  
    Duration: 00:10:25.17, start: 0.000000, bitrate: 44237 kb/s
  
      Stream #0:0: Video: rawvideo, bgr24, 640x480, 6 fps, 6 tbr, 6 tbn, 6 tbc
  
  File 'output.mkv' already exists. Overwrite ? [y/N] y
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x1fd7160] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
  [libx264 @ 0x1fd7160] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit
  
  [libx264 @ 0x1fd7160] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=9 psy=0 mixed_ref=1 me_range=24 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=6 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
  
  Output #0, matroska, to 'output.mkv':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 640x480, q=-1--1, 6 fps, 1k tbn, 6 tbc
  
      Metadata:
  
        encoder         : Lavc56.13.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame= 3751 fps= 40 q=-1.0 Lsize=  133724kB time=00:10:25.16 bitrate=1752.3kbits/s    
  
  video:133691kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.024307%
  
  [libx264 @ 0x1fd7160] frame I:16    Avg QP: 0.00  size: 58298
  
  [libx264 @ 0x1fd7160] frame P:3735  Avg QP: 0.00  size: 36403
  
  [libx264 @ 0x1fd7160] mb I  I16..4: 65.3%  6.9% 27.7%
  
  [libx264 @ 0x1fd7160] mb P  I16..4:  3.0%  2.1%  0.2%  P16..4: 71.2%  0.8% 22.4%  0.0%  0.0%    skip: 0.1%
  
  [libx264 @ 0x1fd7160] 8x8 transform intra:36.9% inter:49.5%
  
  [libx264 @ 0x1fd7160] coded y,u,v intra: 79.3% 0.0% 0.0% inter: 97.6% 0.0% 0.0%
  
  [libx264 @ 0x1fd7160] i16 v,h,dc,p: 20%  3% 76%  1%
  
  [libx264 @ 0x1fd7160] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  5%  8% 80%  1%  1%  2%  1%  1%  1%
  
  [libx264 @ 0x1fd7160] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 28% 16%  5%  7%  8%  5%  4%  5%
  
  [libx264 @ 0x1fd7160] Weighted P-Frames: Y:0.2% UV:0.0%
  
  [libx264 @ 0x1fd7160] ref P L0: 63.2%  0.0% 14.2%  5.3%  4.0%  3.2%  2.6%  1.1%  1.0%  1.0%  0.9%  1.1%  0.7%  0.6%  0.6%  0.6%
  
  [libx264 @ 0x1fd7160] kb/s:1751.85

• ffmpeg. Segmentation fault when input process end

  24 mars 2020, par mr.Nobody

  Im using xvfb-run with katalon cli command to execute selenium tests inside docker container (ubuntu 16)

  xvfb-run --listen-tcp --server-num 44 --auth-file /tmp/xvfb.auth -s '-ac -screen 0 1024x768x24' katalon -browserType=Firefox -retry=0 -statusDelay=15 -testSuitePath=Test Suites/Full_cases -runMode=console -reportFolder=/katalon/report -projectPath=/katalon/project.prj &

  and ffmpeg command to record video

  ffmpeg -y -f x11grab -video_size 1024x768 -i :44 -codec:v libx264 -r 12 /katalon/report/output_2.mp4

  But when the xvf-run process ends i have a ffmpeg segmentation fault error. Output file doesn’t save.

  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --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-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, x11grab, from ':44':
  
    Duration: N/A, start: 1584962410.149890, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1024x768, 29.97 fps, 29.97 tbr, 1000k tbn, 29.97 tbc
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x15e1a80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x15e1a80] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-bit
  
  [libx264 @ 0x15e1a80] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=4 threads=9 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=12 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 '/katalon/katalon/report/behat_2.mp4':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 1024x768, q=-1--1, 12 fps, 12288 tbn, 12 tbc
  
      Metadata:
  
        encoder         : Lavc56.60.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  Segmentation fault2 q=26.0 size=     548kB time=00:00:53.08 bitrate=  84.5kbits/s dup=1 drop=1033

  My decision how to save video is send "q" keyword before the xvfb-run ends, but this is very uncomfortable

• How to convert first few seconds of a video to multiple output formats using ffmpeg

  5 juin 2012, par Hadi

  I want to convert first few seconds (say 5 seconds) of a video to multiple output formats using ffmpeg.

  when I Use this syntax to convert whole video, everything goes ok :
  (to be simple, i left all options to be default)

  ffmpeg -i input.flv output1.mp4 output2.avi

  but when trying for just first 5 seconds using this syntax :

  ffmpeg -t 5 -i input.flv output1.mp4 output2.avi

  first output file (i.e ouptput1.mp4) is ok and it is 5 seconds length, but the second (and next outputs, if present) has a size of original file.

  this is what ffmpeg prints out on the screen.

  D:\ffmpeg\bin>ffmpeg -t 5 -i input.flv output1.mp4 output2.avi
  
  ffmpeg version N-40301-gc1fe2db Copyright (c) 2000-2012 the FFmpeg developers
  
    built on May  3 2012 11:40:38 with gcc 4.6.3
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
  
  ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass
  
   --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable
  
  -libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libope
  
  njpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libth
  
  eora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-
  
  libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --e
  
  nable-zlib
  
    libavutil      51. 49.100 / 51. 49.100
  
    libavcodec     54. 17.101 / 54. 17.101
  
    libavformat    54.  3.100 / 54.  3.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 72.104 /  2. 72.104
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 11.100 /  0. 11.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, flv, from 'input.flv':
  
    Duration: 00:00:37.00, start: 0.000000, bitrate: 366 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 320x240, 300 kb/s, 29.97 tbr, 1k tbn, 1k
  
  tbc
  
      Stream #0:1: Audio: mp3, 22050 Hz, mono, s16, 56 kb/s
  
  [buffer @ 01de98c0] w:320 h:240 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:fl
  
  ags=2
  
  [buffer @ 01dea4e0] w:320 h:240 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:fl
  
  ags=2
  
  [libx264 @ 02b067a0] using cpu capabilities: MMX2 Cache64
  
  [libx264 @ 02b067a0] profile High, level 1.3
  
  [libx264 @ 02b067a0] 264 - core 120 r2164 da19765 - H.264/MPEG-4 AVC codec - Cop
  
  yleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
  
  lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
  
  e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro
  
  ma_qp_offset=-2 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_c
  
  ompat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 we
  
  ightb=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 'output1.mp4':
  
    Metadata:
  
      encoder         : Lavf54.3.100
  
      Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 320x240, q=-1--1, 3
  
  0k tbn, 29.97 tbc
  
      Stream #0:1: Audio: aac (@[0][0][0] / 0x0040), 22050 Hz, mono, s16, 128 kb/s
  
  
  
  Output #1, avi, to 'output2.avi':
  
    Metadata:
  
      ISFT            : Lavf54.3.100
  
      Stream #1:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x240, q=2-31, 200
  
   kb/s, 29.97 tbn, 29.97 tbc
  
      Stream #1:1: Audio: mp3 (U[0][0][0] / 0x0055), 22050 Hz, mono, s16
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> libx264)
  
    Stream #0:1 -> #0:1 (mp3 -> libvo_aacenc)
  
    Stream #0:0 -> #1:0 (flv -> mpeg4)
  
    Stream #0:1 -> #1:1 (mp3 -> libmp3lame)
  
  Press [q] to stop, [?] for help
  
  frame=   48 fps=0.0 q=29.0 q=2.4 size=       8kB time=00:00:00.16 bitrate= 399.6
  
  frame=   62 fps= 59 q=29.0 q=2.4 size=      32kB time=00:00:00.63 bitrate= 408.8
  
  frame=   73 fps= 46 q=29.0 q=3.5 size=      57kB time=00:00:01.00 bitrate= 466.1
  
  frame=  104 fps= 50 q=29.0 q=3.5 size=      87kB time=00:00:02.03 bitrate= 349.7
  
  frame=  134 fps= 52 q=29.0 q=3.6 size=     113kB time=00:00:03.03 bitrate= 303.9
  
  ***frame=  150 fps= 49 q=29.0 q=2.4 size=     126kB time=00:00:03.57 bitrate= 289.3
  
  frame=  150 fps= 42 q=29.0 q=8.8 size=     126kB time=00:00:03.57 bitrate= 289.3
  
  frame=  150 fps= 37 q=29.0 q=6.9 size=     126kB time=00:00:03.57 bitrate= 289.3
  
  frame=  150 fps= 33 q=29.0 q=9.7 size=     126kB time=00:00:03.57 bitrate= 289.3
  
  frame=  150 fps= 29 q=29.0 q=6.0 size=     126kB time=00:00:03.57 bitrate= 289.3
  
  frame=  150 fps= 27 q=29.0 q=11.2 size=     126kB time=00:00:03.57 bitrate= 289.***
  
  frame=  150 fps= 24 q=29.0 Lq=11.0 size=     171kB time=00:00:04.93 bitrate= 283
  
  .7kbits/s
  
  video:1282kB audio:225kB global headers:0kB muxing overhead -88.650217%
  
  [libx264 @ 02b067a0] frame I:1     Avg QP:10.27  size:    74
  
  [libx264 @ 02b067a0] frame P:114   Avg QP:23.49  size:   727
  
  [libx264 @ 02b067a0] frame B:35    Avg QP:29.30  size:   124
  
  [libx264 @ 02b067a0] consecutive B-frames: 68.0%  2.7%  0.0% 29.3%
  
  [libx264 @ 02b067a0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 02b067a0] mb P  I16..4:  2.1%  3.2%  0.1%  P16..4: 19.2%  5.1%  3.6%
  
   0.0%  0.0%    skip:66.6%
  
  [libx264 @ 02b067a0] mb B  I16..4:  0.2%  0.5%  0.0%  B16..8:  9.6%  1.2%  0.4%
  
   direct: 0.6%  skip:87.4%  L0:46.1% L1:42.5% BI:11.4%
  
  [libx264 @ 02b067a0] 8x8 transform intra:51.7% inter:78.4%
  
  [libx264 @ 02b067a0] coded y,uvDC,uvAC intra: 29.8% 44.5% 10.3% inter: 8.9% 10.3
  
  % 2.2%
  
  [libx264 @ 02b067a0] i16 v,h,dc,p: 52% 31% 16%  1%
  
  [libx264 @ 02b067a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 25% 45%  1%  0%  1%  0%
  
   1%  3%
  
  [libx264 @ 02b067a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 48% 23%  2%  1%  2%  3%
  
   2%  1%
  
  [libx264 @ 02b067a0] i8c dc,h,v,p: 54% 26% 16%  3%
  
  [libx264 @ 02b067a0] Weighted P-Frames: Y:2.6% UV:0.9%
  
  [libx264 @ 02b067a0] ref P L0: 79.8%  7.0%  9.6%  3.6%  0.0%
  
  [libx264 @ 02b067a0] ref B L0: 92.5%  6.7%  0.8%
  
  [libx264 @ 02b067a0] ref B L1: 96.8%  3.2%
  
  [libx264 @ 02b067a0] kb/s:139.51
  
  
  
  D:\ffmpeg\bin>

  How is the correct syntax to get all output files same size ?

  isn't this a bug with ffmpeg ? (note last lines of conversion progress, which all timestamps look same)

  thanks in advance.