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• Revision bccc785f63 : Merge "Reuse inter prediction result in real-time speed 6"

  25 juin 2014, par Yunqing Wang

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_pickmode.c

  
   Modify /vp9/encoder/vp9_speed_features.c

  
   Modify /vp9/encoder/vp9_speed_features.h

  
  
  Merge "Reuse inter prediction result in real-time speed 6"

• Video Conversion to have Play Speed

  24 juin 2014, par Taufiq

  There is a open source Media Player Component called Media Kit (https://wpfmediakit.codeplex.com/). It supports Play Speed. But its dependent on video format.

  I have generated a video using SharpAvi (http://sharpavi.codeplex.com/) sample project, using Motion Jepg Encoder.

  This video does not have Play Speed support for some reason. Details Below from ffmpeg

  Video: mjpeg (MJPG / 0x47504A4D), yuvj420p(pc), 1920x1080 [SAR 96:96 DAR 16:9], 9818 kb/s, 10 fps, 10 tbr, 10 tbn, 10 tbc

  Next I download an flv video from Youtube and Media Kit’s play speed works fine with this video.

  Video: flv1, yuv420p, 426x240, 259 kb/s, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc

  Now I converted them into common MP4 format using ffmepg

  ffmpeg -i "1.avi" -ar 22050 -b 2048k "1.mp4"
  
  ffmpeg -i "2.flv" -ar 22050 -b 2048k "2.mp4"

  Results

  1.mp4

   Video: h264 (High) (avc1 / 0x31637661), yuv420p, 426x240, 1235 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)

  2.mp4

  Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920 x1080 [SAR 1:1 DAR 16:9], 158 kb/s, 10 fps, 10 tbr, 10240 tbn, 20 tbc (default)

  The thing is the converted video from flv file still supports play speed where else the converted mp4 from the Avi does not. What is that I am missing

  More Details Below.

  AVI File

  ffmpeg -i "1.avi" ffmpeg version N-64167-gca35037 Copyright (c) 2000-2014 the FFmpeg developers   built on Jun 22 2014 22:02:17 with gcc 4.8.3 (GCC)   configuration:
  
  --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable- libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
  
  -enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
  
  --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable- libxavs --enable-libxvid --enable-decklink --enable-zlib   libavutil      52. 90.100 / 52. 90.100   libavcodec     55. 68.100 /
  
  55. 68.100   libavformat    55. 44.100 / 55. 44.100   libavdevice    55. 13.101 / 55. 13.101   libavfilter     4.  9.100 /  4.  9.100   libswscale      2.  6.100 /  2.  6.100   libswresample   0. 19.100 / 
  
  0. 19.100   libpostproc    52.  3.100 / 52.  3.100 [avi @ 028fe560] non-interleaved AVI Input #0, avi, from '1.avi':   Duration: 00:00:37.50, start: 0.000000, bitrate: 9794 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj420p(pc), 1920x1080 [SAR 96:96 DAR 16:9], 9818 kb/s, 10 fps, 10 tbr, 10 tbn, 10 tbc
  
      Metadata:
  
        title           : Screencast At least one output file must be specified

  fLV File

  ffmpeg -i "2.flv" ffmpeg version N-64167-gca35037 Copyright (c) 2000-2014 the FFmpeg developers   built on Jun 22 2014 22:02:17 with gcc 4.8.3 (GCC)   configuration:
  
  --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable- libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
  
  -enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
  
  --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable- libxavs --enable-libxvid --enable-decklink --enable-zlib   libavutil      52. 90.100 / 52. 90.100   libavcodec     55. 68.100 /
  
  55. 68.100   libavformat    55. 44.100 / 55. 44.100   libavdevice    55. 13.101 / 55. 13.101   libavfilter     4.  9.100 /  4.  9.100   libswscale      2.  6.100 /  2.  6.100   libswresample   0. 19.100 / 
  
  0. 19.100   libpostproc    52.  3.100 / 52.  3.100 [flv @ 02b8e560] Stream discovered after head already parsed Input #0, flv, from '2.flv':   Metadata:
  
      starttime       : 0
  
      totalduration   : 85
  
      totaldatarate   : 325
  
      bytelength      : 3438869
  
      canseekontime   : true
  
      sourcedata      : B4A7DA902MM1403531086617082
  
      purl            :
  
      pmsg            :   Duration: 00:01:24.63, start: 0.000000, bitrate: 325 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 426x240, 259 kb/s, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: mp3, 22050 Hz, stereo, s16p, 65 kb/s
  
      Stream #0:2: Data: none At least one output file must be specified

  AVI to MP4

  ffmpeg -i "1.mp4" ffmpeg version N-64167-gca35037 Copyright (c) 2000-2014 the FFmpeg developers   built on Jun 22 2014 22:02:17 with gcc 4.8.3 (GCC)   configuration:
  
  --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable- libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
  
  -enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
  
  --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable- libxavs --enable-libxvid --enable-decklink --enable-zlib   libavutil      52. 90.100 / 52. 90.100   libavcodec     55. 68.100 /
  
  55. 68.100   libavformat    55. 44.100 / 55. 44.100   libavdevice    55. 13.101 / 55. 13.101   libavfilter     4.  9.100 /  4.  9.100   libswscale      2.  6.100 /  2.  6.100   libswresample   0. 19.100 / 
  
  0. 19.100   libpostproc    52.  3.100 / 52.  3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':   Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.44.100   Duration: 00:00:37.50, start: 0.000000, bitrate: 159 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920 x1080 [SAR 1:1 DAR 16:9], 158 kb/s, 10 fps, 10 tbr, 10240 tbn, 20 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler At least one output file must be specified

  FLV to MP4

  ffmpeg -i "2.mp4" ffmpeg version N-64167-gca35037 Copyright (c) 2000-2014 the FFmpeg developers   built on Jun 22 2014 22:02:17 with gcc 4.8.3 (GCC)   configuration:
  
  --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable- libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
  
  -enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
  
  --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable- libxavs --enable-libxvid --enable-decklink --enable-zlib   libavutil      52. 90.100 / 52. 90.100   libavcodec     55. 68.100 /
  
  55. 68.100   libavformat    55. 44.100 / 55. 44.100   libavdevice    55. 13.101 / 55. 13.101   libavfilter     4.  9.100 /  4.  9.100   libswscale      2.  6.100 /  2.  6.100   libswresample   0. 19.100 / 
  
  0. 19.100   libpostproc    52.  3.100 / 52.  3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':   Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.44.100   Duration: 00:01:24.81, start: 0.072562, bitrate: 1365 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 426x240, 1235 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 12 8 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler At least one output file must be specified

• FFMPEG - Reduce speed / framerate of resulting video ?

  29 avril 2014, par shikata

  I’m using this commnand in order to convert a set of JPGs into a video. The code works but the resulting video is too fast

  exec('ffmpeg -y -f image2 -i img%d.jpg video.mpg 2>&1 >/dev/null', $output, $exit_status);

  I’ve tried to add -r 15 before the output file name but it didn’t work.

  Here what I’ve tried but didn’t work :

   exec('ffmpeg -y -f image2 -i img%d.jpg -r 15 video.mpg 2>&1 >/dev/null', $output, $exit_status);

  Any hints would be highly appreciated