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• C++ Realtime OpenGL videogame streaming library

  23 août 2013, par Mufasa

  I need to select a video encoder and library to take raw RGB frames in realtime from a videogame and send them to a remote client. The remote client is sending back mouse events. Right now I have a setup where the server is using glReadPixels to read frame data, then sending information in the form of 16x16 tiles with runlength encoding that have changed since the last read. (The videogame has a lot of solid color areas). My client works to control the game. But the transmission of frames to the client, and mouse events from the client, is too slow. Both use a TCP socket to communicate.

  I'm looking into using ffmpeg or x264 to encode into H.264 video ; do you think this could reduce latency ? I'm on windows and I can't figure out how to set up x264 libraries in Visual Studio, but I have got ffmpeg libraries installed.

  Another name I have heard is live555 but I don't know much about that.

  Do you have any recommendations ?

• muxing overhead error when converting a video via ffmpeg

  16 décembre 2016, par john smoth

  I’m using ffmpeg to converting videos on my site.
  I’m converting all the videos to flv . if I upload flv , it has not problem but if I upload any other file type except flv , it shows me this error :

  ffmpeg version 0.7.11, Copyright (c) 2000-2011 the FFmpeg developers built on Jul 26 2013 01:58:02 with gcc 4.4.7 20120313 (Red Hat 4.4.7-3) 
  
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-shared --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvorbis 
  
  --enable-libopencore-amrnb --enable-libopencore-amrwb libavutil 50. 43. 0 / 50. 43. 0 libavcodec 52.123. 0 / 52.123. 0 libavformat 52.111. 0 / 52.111. 0 
  
  libavdevice 52. 5. 0 / 52. 5. 0 libavfilter 1. 80. 0 / 1. 80. 0 libswscale 0. 14. 1 / 0. 14. 1 libpostproc 51. 2. 0 / 51. 2. 0 
  
  Seems stream 0 codec frame rate differs from container frame rate: 2997.00 (2997/1) -> 14.99 (15000/1001) 
  
  Input #0, avi, from 'uploads/v_37.avi': 
  
  Metadata: title : AJ McLean - Teenage Wildlife encoder : Lavf52.16.0
  
  Duration: 00:04:17.19, start: 0.000000, bitrate: 470 kb/s 
  
  Stream #0.0: Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 14.98 fps, 14.99 tbr, 14.99 tbn, 2997 tbc 
  
  Stream #0.1: Audio: mp3, 22050 Hz, stereo, s16, 128 kb/s 
  
  WARNING: The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s 
  
  [buffer @ 0x2137ae0] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param: [scale @ 0x2139da0] w:640 h:480 fmt:yuv420p -> w:320 h:240 fmt:yuv420p flags:0x4 
  
  Output #0, flv, to 'uploads/aaa.flv': Metadata: title : AJ McLean - Teenage Wildlife encoder : Lavf52.111.0 
  
  Stream #0.0: Video: flv, yuv420p, 320x240 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 14.99 tbc Stream #0.1: Audio: libmp3lame, 22050 Hz, stereo, s16, 0 kb/s 
  
  Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 
  
  Press [q] to stop, [?] for help 
  
  frame= 26 fps= 0 q=2.0 Lsize= 80kB time=00:00:01.73 bitrate= 375.7kbits/s video:64kB audio:14kB global headers:0kB muxing overhead 2.339835%

  last line is : muxing overhead 2.339835%

  the final file is a 1 second video ( it doesn’t make any different how long is the video , all of them become a 1 second video )

  What is the problem ?
  this is the ffmpeg code that convert the video :

  echo passthru("$ffmpegpath -i uploads/$file -ar 22050 -ab 32 -f flv -s 320×240 uploads/aaa.flv 2>&1");

  Thanks

  thanks

• FFmpeg failed to transcode - Error while opening encoder for output stream

  26 août 2013, par Nikhil M

  Reported errors

  PHPVideoToolkit error : Execute error. It was not possible to encode "/home/onevid/public_html/sites/default/files/videos/original/qw_1.mpg" as FFmpeg returned an error. The error is with the video codec of the input file. FFmpeg reports the error to be "Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height".

  Executed commands and output

  /usr/local/bin/ffmpeg -i '/home/onevid/public_html/sites/default/files/videos/original/qw_1.mpg' -vf 'scale=540:360' -strict experimental -vcodec 'h263' -qscale '12' -acodec 'aac' -ac '2' -pass '1' -passlogfile '/tmp/1377530626-521b73028a987-multipass'  -y /tmp/1377530626-521b73028a7ea.mp4
  
  ffmpeg version 1.2.2 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 26 2013 15:10:42 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  
    configuration: --disable-yasm
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
  [mpeg @ 0x2e89160] max_analyze_duration 5000000 reached at 5015467 microseconds
  
  Input #0, mpeg, from '/home/onevid/public_html/sites/default/files/videos/original/qw_1.mpg':
  
    Duration: 00:00:14.00, start: 0.011978, bitrate: 3235 kb/s
  
      Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 160 kb/s
  
  Please use -q:a or -q:v, -qscale is ambiguous
  
  [h263 @ 0x2e8b180] The specified picture size of 540x360 is not valid for the H.263 codec.
  
  Valid sizes are 128x96, 176x144, 352x288, 704x576, and 1408x1152. Try H.263+.
  
  Output #0, mp4, to '/tmp/1377530626-521b73028a7ea.mp4':
  
      Stream #0:0: Video: h263, yuv420p, 540x360 [SAR 1:1 DAR 3:2], q=2-31, pass 1, 200 kb/s, 90k tbn, 29.97 tbc
  
      Stream #0:1: Audio: none, 44100 Hz, stereo, fltp, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg2video -> h263)
  
    Stream #0:1 -> #0:1 (mp2 -> aac)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height