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• Revision ccdb518ff8 : Skip certain ALTREF inter modes in ARF coding This commit enables the encoder t

  26 septembre 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Skip certain ALTREF inter modes in ARF coding

  This commit enables the encoder to skip checking ALTREF inter modes
  in ARF coding, if the predicted motion vectors suggest that the
  GOLDEN_FRAME provides higher prediction accuracy than ALTREF_FRAME.

  It improves the speed 3 encoding speed by about 5%, at the expense
  of compression performance loss -0.041% and -0.225% for derf and
  stdhd, respectively.

  pedestrian_area 1080p 2000 kbps
  66705 b/f, 40.909 dB, 118738 ms ->
  66732 b/f, 40.908 dB, 113688 ms

  old_town_cross 720p 1500 kbps
  14427 b/f, 36.256 dB, 62746 ms ->
  14412 b/f, 36.252 dB, 60690 ms

  blue_sky 1080p 1500 kbps
  51026 b/f, 35.897 dB, 73310 ms ->
  50921 b/f, 35.893 dB, 70406 ms

  bus CIF 1000 kbps
  21301 b/f, 34.841 dB, 7326 ms ->
  21248 b/f, 34.837 dB, 7196 ms

  Change-Id : I76cf88b4d655e1ee3c0cb03c8a5745493040e8d2

• Revision 891793a540 : Conditionally skip reference frame check For regular inter frames, if the dista

  29 septembre 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Conditionally skip reference frame check

  For regular inter frames, if the distance from GOLDEN_FRAME is larger
  than 2 and if the predicted motion vector of LAST_FRAME gives lower
  sse than that of GOLDEN_FRAME, skip the GOLDE_FRAME mode checking in
  the rate-distortion optimization. It provides about 5% speed-up at
  expense of -0.137% and -0.230% performance down for speed 3. Local
  experiment results :

  pedestrian 1080p 2000 kbps
  66712 b/f, 40.908 dB, 113688 ms ->
  66768 b/f, 40.911 dB, 108752 ms

  blue_sky 1080p 2000 kbps
  51054 b/f, 35.894 dB, 70406 ms ->
  51051 b/f, 35.891 dB, 67236 ms

  old_town_cross 720p 1500 kbps
  14412 b/f, 36.252 dB, 60690 ms ->
  14431 b/f, 36.249 dB, 57346 ms

  Change-Id : Idfcafe7f63da7a4896602fc60bd7093f0f0d82ca

• ffmpeg ffserver - create a mosaic from two 720p webcam feeds

  28 juillet 2015, par der_felix

  for a project i would like to take the video feeds (NO audio) of two logitech c920 webcams, put them side-by-side and stream them.
  the c920 is able to compress the video feed with h264 itself(if enabled) and delivers 1080p with upto 30fps.
  the stream is then loaded in an android app by a ffmpeg library and rendered to the screen.

  what i already know :
  i know that i can take multiple streams or input files and create a mosaic stream via the filter_complex module.
  http and h264 seem to be good for streaming, but other configurations are also welcom if they are faster/better.

  the question :
  but how can i start the cameras with v4l2, set the camera resoltution and camera internal encoding and use these streams to create the mosaic ?
  the mosaic should be unscaled (=2560x720px).

  and i very often get the error code 256 but didnt find a solution what it means.

  the system : laptop with usb3, ubuntu 15.04x64 ffmpeg 2.7.1 and ffserver 2.5.7

  thanks for your help

  ffserver config :

  HTTPPort 8080                
  
  HTTPBindAddress 0.0.0.0      
  
  MaxHTTPConnections 2000   
  
  MaxClients 1000         
  
  MaxBandwidth 50000
  
  CustomLog -      
  
  #NoDaemon       
  
  
  
  <feed>         
  
  
  
  File /tmp/feed1.ffm
  
  Launch ffmpeg -f v4l2 - input_format h264 -i /dev/video0 -i /dev/video1 -size 1280x720 -r 30 -filter_complex "nullsrc=size=2560x720 [base]; [0:v] setpts=PTS-STARTPTS [left]; [1:v] setpts=PTS-STARTPTS [right]; [base][left] overlay=shortest=1 [tmp1]; [tmp1][right] overlay=shortest=1:x=1280"  -c:v libx264 -f mpegts
  
  
  
  </feed>
  
  
  
  <stream>
  
  
  
  Feed feed1.ffm
  
  Format mpegts      
  
  VideoBitRate 1024   
  
  #VideoBufferSize 1024
  
  VideoFrameRate 30      
  
  #VideoSize hd720      
  
  VideoSize 2560x720
  
  #VideoIntraOnly         
  
  #VideoGopSize 12      
  
  VideoCodec libx264      
  
  NoAudio            
  
  VideoQMin 3         
  
  VideoQMax 31
  
  NoDefaults
  
  
  
  </stream>
  
  
  
  <stream>        
  
     Format status
  
     #Only allow local people to get the status
  
     ACL allow localhost
  
     ACL allow 192.168.0.0 192.168.255.255
  
  </stream>

  output :

  ubuntu@ubuntu:~$ ffserver
  
  ffserver version 2.5.7-0ubuntu0.15.04.1 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --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-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
  
    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
  
  Tue Jul 28 10:13:44 2015 FFserver started.
  
  Tue Jul 28 10:13:44 2015 Launch command line: ffmpeg -f v4l2 - input_format h264 -i /dev/video0 -i /dev/video1 -size 1280x720 -r 30 -filter_complex nullsrc=size=2560x720 [base]; [0:v] setpts=PTS-STARTPTS [left]; [1:v] setpts=PTS-STARTPTS [right]; [base][left] overlay=shortest=1 [tmp1]; [tmp1][right] overlay=shortest=1:x=1280 -c:v libx264 -f mpegts http://127.0.0.1:8080/feed1.ffm
  
  feed1.ffm: Pid 17388 exited with status 256 after 0 seconds

  Hey guys !

  Here is our plan b for the mosaic stream.

  Alternative config :

  HTTPPort 8080         
  
  HTTPBindAddress 0.0.0.0   
  
  MaxHTTPConnections 2000   
  
  MaxClients 1000         
  
  MaxBandwidth 50000      
  
  CustomLog -         
  
  
  
  <feed>
  
  File /tmp/feedlinks.ffm
  
  Launch ffmpeg -f v4l2 -input_format h264 -vcodec h264 -i /dev/video0 -video_size 1280x720 -r 30
  
  </feed>
  
  
  
  <feed>
  
  File /tmp/feedrechts.ffm
  
  Launch ffmpeg -f v4l2 -input_format h264 -vcodec h264 -i /dev/video1 -video_size 1280x720 -r 30 
  
  </feed>
  
  
  
  <stream>
  
  Feed feedlinks.ffm
  
  Format mpegts
  
  VideoBitRate 512
  
  VideoFrameRate 30
  
  VideoSize hd720
  
  VideoCodec libx264
  
  NoAudio
  
  VideoQMin 3
  
  VideoQMax 31
  
  </stream>
  
  
  
  <stream>
  
  Feed feedrechts.ffm
  
  Format mpegts
  
  VideoBitRate 512
  
  VideoFrameRate 30
  
  VideoSize hd720
  
  VideoCodec libx264
  
  NoAudio
  
  VideoQMin 3
  
  VideoQMax 31
  
  </stream>
  
  
  
  <feed>
  
  File /tmp/feedmosaic.ffm
  
  Launch ffmpeg -i http://localhost:8080/testlinks.mpg -i http://localhost:8080/testrechts.mpg -filter_complex "nullsrc=size=2560x720 [base]; [0:v] setpts=PTS-STARTPTS [left]; [1:v] setpts=PTS-STARTPTS [right]; [base][left] overlay=shortest=1 [tmp1]; [tmp1][right] overlay=shortest=1:x=1280" -c:v libx264 -preset ultrafast -f mpegts
  
  </feed>
  
  
  
  <stream>
  
  Feed feedmosaic.ffm
  
  Format mpegts         # Format of the stream
  
  VideoFrameRate 30      # Number of frames per second
  
  VideoSize 2560x720
  
  VideoCodec libx264      # Choose your codecs.
  
  NoAudio            # Suppress audio
  
  VideoQMin 3         # Videoquality ranges from 1 - 31 (worst to best)
  
  VideoQMax 31
  
  NoDefaults
  
  </stream>
  
  
  
  <stream>           # Server status URL
  
     Format status
  
     # Only allow local people to get the status
  
     ACL allow localhost
  
     ACL allow 192.168.0.0 192.168.255.255
  
     ACL allow 192.168.178.0 192.168.255.255
  
  </stream>

  And this is the new output :

  ubuntu@ubuntu:~$ ffserver
  
  ffserver version 2.5.7-0ubuntu0.15.04.1 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --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-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
  
    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
  
  /etc/ffserver.conf:44: Setting default value for video bit rate tolerance = 128000. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:44: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:44: Setting default value for video max rate = 1024000. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:44: Setting default value for video buffer size = 1024000. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:61: Setting default value for video bit rate tolerance = 128000. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:61: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:61: Setting default value for video max rate = 1024000. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:61: Setting default value for video buffer size = 1024000. Use NoDefaults to disable it.
  
  Tue Jul 28 11:13:01 2015 Codec bitrates do not match for stream 0
  
  Tue Jul 28 11:13:01 2015 FFserver started.
  
  Tue Jul 28 11:13:01 2015 Launch command line: ffmpeg -f v4l2 -input_format h264 -vcodec h264 -i /dev/video0 -video_size 1280x720 -r 30 http://127.0.0.1:8080/feedlinks.ffm
  
  Tue Jul 28 11:13:01 2015 Launch command line: ffmpeg -f v4l2 -input_format h264 -vcodec h264 -i /dev/video1 -video_size 1280x720 -r 30 http://127.0.0.1:8080/feedrechts.ffm
  
  Tue Jul 28 11:13:01 2015 Launch command line: ffmpeg -i http://localhost:8080/testlinks.mpg -i http://localhost:8080/testrechts.mpg -filter_complex nullsrc=size=2560x720 [base]; [0:v] setpts=PTS-STARTPTS [left]; [1:v] setpts=PTS-STARTPTS [right]; [base][left] overlay=shortest=1 [tmp1]; [tmp1][right] overlay=shortest=1:x=1280 -c:v libx264 -preset ultrafast -f mpegts http://127.0.0.1:8080/feedmosaic.ffm
  
  Tue Jul 28 11:13:02 2015 127.0.0.1 - - [GET] "/feedlinks.ffm HTTP/1.1" 200 4175
  
  Tue Jul 28 11:13:02 2015 127.0.0.1 - - [GET] "/feedrechts.ffm HTTP/1.1" 200 4175
  
  Tue Jul 28 11:13:18 2015 127.0.0.1 - - [POST] "/feedmosaic.ffm HTTP/1.1" 200 4096
  
  Tue Jul 28 11:13:18 2015 127.0.0.1 - - [GET] "/testlinks.mpg HTTP/1.1" 200 2130291
  
  Tue Jul 28 11:13:18 2015 127.0.0.1 - - [GET] "/testrechts.mpg HTTP/1.1" 200 1244999
  
  feedmosaic.ffm: Pid 18775 exited with status 256 after 17 seconds

  Thanks for your help !