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• avdevice/xcbgrab : don't assume xserver endianness

  31 janvier 2021, par Andriy Gelman

  avdevice/xcbgrab : don't assume xserver endianness
  xserver defines the endianness of the grabbed images. Use this information
  
  to set the correct pixel format.
  This also fixes format selection in configuration depth=32/bpp=32 with
  
  xserver on a little endian machine. Before the patch, the big endian
  
  layout 0RGB was always selected which is incorrect because BGR0 should
  
  be used. RGB24 was also incorrectly assumed (but this format was removed
  
  in xserver 1.20).
  The big-endian settings can be tested using docker+qemu from a little-endian
  
  machine :
  $ docker run —rm —privileged multiarch/qemu-user-static —reset -p yes
  
  $ docker run —rm -it -v /tmp :/tmp powerpc64/debian /bin/bash
  In docker container
  
  $ apt-get update
  
  $ apt-get install xvfb
  
  $ apt-get install x11-apps
  To test AV_PIX_FMT_0RGB32
  
  $ Xvfb :2 -screen 0 720x480x24 &
  
  $ export DISPLAY=:2
  
  $ xclock -geometry 720x480 -bg green #test different colors
  On your host machine grab the frames using the following
  
  command. View output to check that colors are rendered correctly
  
  $ ./ffmpeg -y -f x11grab -i :2.0 -codec:v mpeg2video out.mp4
  Other pixel formats can be tested by modifying how Xvfb is started in the docker
  
  container :
  AV_PIX_FMT_RGB565
  
  $ Xvfb :2 -screen 0 720x480x16
  AV_PIX_FMT_RGB555
  
  $ Xvfb :2 -screen 0 720x480x15
  AV_PIX_FMT_BGR24 / AV_PIX_FMT_RGB24
  
  This is difficult to test because bpp=24 support was removed in xserver 1.20
  
  https://lists.x.org/archives/xorg-devel/2018-February/056175.html?hmsr=joyk.com&utm_source=joyk.com&utm_medium=referral
  
  However, I was able to run previous version of Xvfb (with some
  
  modifications to force 24bpp) to check that images are rendered correctly.
  Reviewed-by : Carl Eugen Hoyos <ceffmpeg@gmail.com>
  
  Signed-off-by : Andriy Gelman <andriy.gelman@gmail.com>
  

  • [DH] libavdevice/xcbgrab.c

• Run makesprites.py on debian 9

  2 novembre 2017, par Nakemos

  I try to run makesprites.py (https://github.com/vlanard/videoscripts/blob/master/sprites/makesprites.py) on a .mp4 file with the command :

  for f in 480/*.mp4 ; do python makesprites.py $f ; done

  My ffmpeg version :
  ffmpeg version 3.2.8-1 deb9u1 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18) 20170516

  But I have this error :

  root@vps47509:~/test# for f in 480/*.mp4; do python makesprites.py $f; done
  
  Making dir: /root/test/thumbs/1838448.mp_vtt
  
  START [2017-11-02 12:32:17.246337] : ffmpeg -i 480/1838448.mp4 -f image2 -bt 20M -vf fps=1/10 -aspect 16:9 /root/test/thumbs/1838448.mp_vtt/tv%03d.jpg 
  
  END   [2017-11-02 12:33:11.368050]
  
  ffmpeg version 3.2.8-1~deb9u1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  
    configuration: --prefix=/usr --extra-version='1~deb9u1' --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-libebur128 --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. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '480/1838448.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:10:00.02, start: 0.000000, bitrate: 2122 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2010 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 103 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [swscaler @ 0x559cbf99d940] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to '/root/test/thumbs/1838448.mp_vtt/tv%03d.jpg':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.101
  
      Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 0.10 fps, 0.10 tbn, 0.10 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.64.101 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=   61 fps=1.1 q=1.6 Lsize=N/A time=00:10:10.00 bitrate=N/A speed=11.3x    
  
  video:4753kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  
  
  Removing first image, unneeded
  
  60 thumbs written in /root/test/thumbs/1838448.mp_vtt
  
  START [2017-11-02 12:33:11.370139] : mogrify -geometry 100x /root/test/thumbs/1838448.mp_vtt/tv041.jpg /root/test/thumbs/1838448.mp_vtt/tv008.jpg /root/test/thumbs/1838448.mp_vtt/tv023.jpg /root/test/thumbs/1838448.mp_vtt/tv040.jpg /root/test/thumbs/1838448.mp_vtt/tv025.jpg /root/test/thumbs/1838448.mp_vtt/tv059.jpg /root/test/thumbs/1838448.mp_vtt/tv060.jpg /root/test/thumbs/1838448.mp_vtt/tv019.jpg /root/test/thumbs/1838448.mp_vtt/tv039.jpg /root/test/thumbs/1838448.mp_vtt/tv030.jpg /root/test/thumbs/1838448.mp_vtt/tv052.jpg /root/test/thumbs/1838448.mp_vtt/tv061.jpg /root/test/thumbs/1838448.mp_vtt/tv038.jpg /root/test/thumbs/1838448.mp_vtt/tv014.jpg /root/test/thumbs/1838448.mp_vtt/tv048.jpg /root/test/thumbs/1838448.mp_vtt/tv044.jpg /root/test/thumbs/1838448.mp_vtt/tv047.jpg /root/test/thumbs/1838448.mp_vtt/tv053.jpg /root/test/thumbs/1838448.mp_vtt/tv055.jpg /root/test/thumbs/1838448.mp_vtt/tv026.jpg /root/test/thumbs/1838448.mp_vtt/tv024.jpg /root/test/thumbs/1838448.mp_vtt/tv010.jpg /root/test/thumbs/1838448.mp_vtt/tv007.jpg /root/test/thumbs/1838448.mp_vtt/tv056.jpg /root/test/thumbs/1838448.mp_vtt/tv002.jpg /root/test/thumbs/1838448.mp_vtt/tv017.jpg /root/test/thumbs/1838448.mp_vtt/tv036.jpg /root/test/thumbs/1838448.mp_vtt/tv045.jpg /root/test/thumbs/1838448.mp_vtt/tv035.jpg /root/test/thumbs/1838448.mp_vtt/tv050.jpg /root/test/thumbs/1838448.mp_vtt/tv033.jpg /root/test/thumbs/1838448.mp_vtt/tv051.jpg /root/test/thumbs/1838448.mp_vtt/tv043.jpg /root/test/thumbs/1838448.mp_vtt/tv028.jpg /root/test/thumbs/1838448.mp_vtt/tv009.jpg /root/test/thumbs/1838448.mp_vtt/tv003.jpg /root/test/thumbs/1838448.mp_vtt/tv020.jpg /root/test/thumbs/1838448.mp_vtt/tv004.jpg /root/test/thumbs/1838448.mp_vtt/tv027.jpg /root/test/thumbs/1838448.mp_vtt/tv021.jpg /root/test/thumbs/1838448.mp_vtt/tv006.jpg /root/test/thumbs/1838448.mp_vtt/tv022.jpg /root/test/thumbs/1838448.mp_vtt/tv015.jpg /root/test/thumbs/1838448.mp_vtt/tv049.jpg /root/test/thumbs/1838448.mp_vtt/tv032.jpg /root/test/thumbs/1838448.mp_vtt/tv016.jpg /root/test/thumbs/1838448.mp_vtt/tv011.jpg /root/test/thumbs/1838448.mp_vtt/tv031.jpg /root/test/thumbs/1838448.mp_vtt/tv058.jpg /root/test/thumbs/1838448.mp_vtt/tv029.jpg /root/test/thumbs/1838448.mp_vtt/tv057.jpg /root/test/thumbs/1838448.mp_vtt/tv042.jpg /root/test/thumbs/1838448.mp_vtt/tv005.jpg /root/test/thumbs/1838448.mp_vtt/tv018.jpg /root/test/thumbs/1838448.mp_vtt/tv034.jpg /root/test/thumbs/1838448.mp_vtt/tv046.jpg /root/test/thumbs/1838448.mp_vtt/tv012.jpg /root/test/thumbs/1838448.mp_vtt/tv054.jpg /root/test/thumbs/1838448.mp_vtt/tv013.jpg /root/test/thumbs/1838448.mp_vtt/tv037.jpg 
  
  ERROR   [2017-11-02 12:33:11.377429] An exception occurred
  
  None
  
  [Errno 2] No such file or directory
  
  Traceback (most recent call last):
  
    File "makesprites.py", line 281, in <module>
  
      run(task)
  
    File "makesprites.py", line 248, in run
  
      resize(thumbfiles)
  
    File "makesprites.py", line 128, in resize
  
      doCmd("mogrify -geometry %dx %s" % (THUMB_WIDTH," ".join(map(pipes.quote, files))))
  
    File "makesprites.py", line 91, in doCmd
  
      raise e #todo ?
  
  OSError: [Errno 2] No such file or directory
  
  </module>

  In the folder, I have the .jpg files, but not the XXX.mp_thumbs.vtt. Any idea ?

• Orientation issue with mobile recordings

  18 mai 2012, par Kim Egede Jakobsen

  When I convert .mov files from iPhone 4 and .3gp from Android with FFMPEG.
  I need to rotate the video 90 degress, but iPhone 4s needs 180 degress...

  Is there any way to fix this ?