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• ffmpeg : Generate video from picture

  16 octobre 2013, par Tchoupi

  I'm currently trying to generate a video from a single picture (1980*1024)
  Here my cmd :

  ffmpeg -threads 8 -r 1 -loop 1 -i "C:\Library\Titling\__Resources\1.jpg" -t 5.00 -pix_fmt yuv420p -vcodec libx264 -b:v 1500k -s 720:576 -aspect 1.0000 -y "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary_WithtoutAudio1.mp4"

  here cmd execution :

  ffmpeg version N-56297-g7ac6c63 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Sep 15 2013 18:02:28 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
  
  bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
  libavutil 52. 43.100 / 52. 43.100
  
  libavcodec 55. 31.101 / 55. 31.101
  
  libavformat 55. 16.102 / 55. 16.102
  
  libavdevice 55. 3.100 / 55. 3.100
  
  libavfilter 3. 84.100 / 3. 84.100
  
  libswscale 2. 5.100 / 2. 5.100
  
  libswresample 0. 17.103 / 0. 17.103
  
  libpostproc 52. 3.100 / 52. 3.100
  
  Input #0, image2, from 'C:\Library\Titling\__Resources\1.jpg':
  
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
  Stream #0:0: Video: mjpeg, yuvj420p(pc), 1920x1080 [SAR 96:96 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [swscaler @ 025bec00] deprecated pixel format used, make sure you did set range correctly
  
  [libx264 @ 025b7ce0] using SAR=4/5
  
  [libx264 @ 025b7ce0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 025b7ce0] profile High, level 2.2
  
  [libx264 @ 025b7ce0] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subm
  
  e=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=-2 threads=12 lookahead_threads=2 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=1 scenecut=40 intra_refresh=0 rc_lookahead=40 rc
  
  =abr mbtree=1 bitrate=1500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'D:\Records\2013-10-11_115453\PublishingDirectory\Temporary_WithtoutAudio1.mp4':
  
  Metadata:
  
  encoder : Lavf55.16.102
  
  Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x576 [SAR 4:5 DAR 1:1], q=-1--1, 1500 kb/s, 16384 tbn, 1 tbc
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (mjpeg -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame= 5 fps=0.0 q=-1.0 Lsize= 64kB time=00:00:03.00 bitrate= 174.0kbits/s
  
  video:63kB audio:0kB subtitle:0 global headers:0kB muxing overhead 1.355758%
  
  [libx264 @ 025b7ce0] frame I:1 Avg QP: 0.00 size: 63203
  
  [libx264 @ 025b7ce0] frame P:1 Avg QP: 0.00 size: 250
  
  [libx264 @ 025b7ce0] frame B:3 Avg QP: 0.00 size: 64
  
  [libx264 @ 025b7ce0] consecutive B-frames: 20.0% 0.0% 0.0% 80.0%
  
  [libx264 @ 025b7ce0] mb I I16..4: 78.8% 4.0% 17.2%
  
  [libx264 @ 025b7ce0] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 1.2% 0.0% 0.1% 0.0% 0.0% skip:98.6%
  
  [libx264 @ 025b7ce0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.9% 0.0% 0.0% direct: 0.0% skip:99.0% L0:12.8% L1:87.2% BI: 0.0%
  
  [libx264 @ 025b7ce0] final ratefactor: -14.43
  
  [libx264 @ 025b7ce0] 8x8 transform intra:4.0% inter:0.0%
  
  [libx264 @ 025b7ce0] coded y,uvDC,uvAC intra: 22.8% 24.1% 24.1% inter: 0.2% 0.0% 0.0%
  
  [libx264 @ 025b7ce0] i16 v,h,dc,p: 93% 1% 4% 2%
  
  [libx264 @ 025b7ce0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 19% 13% 6% 6% 7% 7% 12% 4%
  
  [libx264 @ 025b7ce0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 15% 11% 7% 7% 9% 7% 14% 6%
  
  [libx264 @ 025b7ce0] i8c dc,h,v,p: 85% 4% 6% 5%
  
  [libx264 @ 025b7ce0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 025b7ce0] kb/s:101.83

  At this step I have two problems :
  first is a warning during execution
  deprecated pixel format used, make sure you did set range correctly
  The second is the video do not work correctly in VLC (video is "black") but it work in wmp...
  

  Then I add an empty audio track :

  ffmpeg -threads 8 -f lavfi -i aevalsrc=0 -i "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary_WithtoutAudio1.mp4" -vcodec copy -b:v 1500k -acodec aac -map 1:0 -map 0:0 -shortest -strict experimental -y "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary1.mp4"

  After that I concat this video to others using complex filter .
  When I concat my videos I have this message :
  

  [output stream 0:1 @ 0451d3a0] 100 buffers queued in output stream 0:1, something may be wrong.

  And when i Watch the result my video freeze after the image insertion for a approximatly a seconde .
  perhaps it is not related
  I don't know ...

  Here my concat command and execution log
  

  D:\test>ffmpeg.exe -threads 8 -i "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary0.mp4" -i "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary1.mp4" -i "D:\Records\2013-10-11_115
  
  453\PublishingDirectory\Temporary2.mp4" -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] concat=n=3:v=1:a=1 [v] [a] " -map "[v]" -map "[a]" -vcodec libx264 -b 1500000 -s 720:576 -y "D:\Records\
  
  2013-10-11_115453\PublishingDirectory\EditedVideo.mp4"

  ..

  ffmpeg version N-56297-g7ac6c63 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Sep 15 2013 18:02:28 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
  
  bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
  libavutil 52. 43.100 / 52. 43.100
  
  libavcodec 55. 31.101 / 55. 31.101
  
  libavformat 55. 16.102 / 55. 16.102
  
  libavdevice 55. 3.100 / 55. 3.100
  
  libavfilter 3. 84.100 / 3. 84.100
  
  libswscale 2. 5.100 / 2. 5.100
  
  libswresample 0. 17.103 / 0. 17.103
  
  libpostproc 52. 3.100 / 52. 3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Records\2013-10-11_115453\PublishingDirectory\Temporary0.mp4':
  
  Metadata:
  
  major_brand : isom
  
  minor_version : 512
  
  compatible_brands: isomiso2avc1mp41
  
  title : Wildlife in HD
  
  encoder : Lavf54.22.100
  
  comment : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
  copyright : ┬® 2008 Microsoft Corporation
  
  Duration: 00:00:13.70, start: 0.000000, bitrate: 1914 kb/s
  
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [SAR 4:5 DAR 1:1], 1778 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  Metadata:
  
  handler_name : VideoHandler
  
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
  Metadata:
  
  handler_name : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Records\2013-10-11_115453\PublishingDirectory\Temporary1.mp4':
  
  Metadata:
  
  major_brand : isom
  
  minor_version : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder : Lavf55.16.102
  
  Duration: 00:00:05.00, start: 0.023220, bitrate: 106 kb/s
  
  Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [SAR 4:5 DAR 1:1], 102 kb/s, 1 fps, 1 tbr, 16384 tbn, 2 tbc (default)
  
  Metadata:
  
  handler_name : VideoHandler
  
  Stream #1:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 1 kb/s (default)
  
  Metadata:
  
  handler_name : SoundHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Records\2013-10-11_115453\PublishingDirectory\Temporary2.mp4':
  
  Metadata:
  
  major_brand : isom
  
  minor_version : 512
  
  compatible_brands: isomiso2avc1mp41
  
  title : Wildlife in HD
  
  encoder : Lavf54.22.100
  
  comment : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
  copyright : ┬® 2008 Microsoft Corporation
  
  Duration: 00:00:16.47, start: 0.000000, bitrate: 2761 kb/s
  
  Stream #2:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [SAR 4:5 DAR 1:1], 2625 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  Metadata:
  
  handler_name : VideoHandler
  
  Stream #2:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
  Metadata:
  
  handler_name : SoundHandler
  
  Please use -b:a or -b:v, -b is ambiguous
  
  [libx264 @ 04c748e0] using SAR=4/5
  
  [libx264 @ 04c748e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 04c748e0] profile High, level 3.1
  
  [libx264 @ 04c748e0] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subm
  
  e=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=-2 threads=12 lookahead_threads=2 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=25 scenecut=40 intra_refresh=0 rc_lookahead=40 r
  
  c=abr mbtree=1 bitrate=1500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'D:\Records\2013-10-11_115453\PublishingDirectory\EditedVideo.mp4':
  
  Metadata:
  
  major_brand : isom
  
  minor_version : 512
  
  compatible_brands: isomiso2avc1mp41
  
  title : Wildlife in HD
  
  copyright : ┬® 2008 Microsoft Corporation
  
  comment : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
  encoder : Lavf55.16.102
  
  Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x576 [SAR 4:5 DAR 1:1], q=-1--1, 1500 kb/s, 30k tbn, 29.97 tbc
  
  Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
  Stream #0:0 (h264) -> concat:in0:v0
  
  Stream #0:1 (aac) -> concat:in0:a0
  
  Stream #1:0 (h264) -> concat:in1:v0
  
  Stream #1:1 (aac) -> concat:in1:a0
  
  Stream #2:0 (h264) -> concat:in2:v0
  
  Stream #2:1 (aac) -> concat:in2:a0
  
  concat:out:v0 -> Stream #0:0 (libx264)
  
  concat:out:a0 -> Stream #0:1 (libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  [output stream 0:1 @ 0451d3a0] 100 buffers queued in output stream 0:1, something may be wrong.
  
  frame= 1054 fps=101 q=-1.0 Lsize= 7676kB time=00:00:35.23 bitrate=1784.7kbits/s dup=146 drop=0
  
  video:7083kB audio:552kB subtitle:0 global headers:0kB muxing overhead 0.543084%
  
  [libx264 @ 04c748e0] frame I:10 Avg QP:18.41 size: 52713
  
  [libx264 @ 04c748e0] frame P:456 Avg QP:24.04 size: 11772
  
  [libx264 @ 04c748e0] frame B:588 Avg QP:26.20 size: 2308
  
  [libx264 @ 04c748e0] consecutive B-frames: 2.8% 67.9% 1.1% 28.1%
  
  [libx264 @ 04c748e0] mb I I16..4: 23.1% 52.7% 24.2%
  
  [libx264 @ 04c748e0] mb P I16..4: 0.6% 4.3% 1.0% P16..4: 35.8% 18.5% 11.9% 0.0% 0.0% skip:27.8%
  
  [libx264 @ 04c748e0] mb B I16..4: 0.1% 0.8% 0.2% B16..8: 34.2% 5.0% 1.3% direct: 1.3% skip:57.0% L0:37.3% L1:53.3% BI: 9.3%
  
  [libx264 @ 04c748e0] final ratefactor: 23.46
  
  [libx264 @ 04c748e0] 8x8 transform intra:67.7% inter:60.0%
  
  [libx264 @ 04c748e0] coded y,uvDC,uvAC intra: 67.1% 69.5% 30.5% inter: 17.0% 11.0% 0.4%
  
  [libx264 @ 04c748e0] i16 v,h,dc,p: 50% 20% 6% 24%
  
  [libx264 @ 04c748e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 16% 18% 6% 8% 10% 7% 9% 8%
  
  [libx264 @ 04c748e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 16% 14% 7% 10% 12% 8% 8% 7%
  
  [libx264 @ 04c748e0] i8c dc,h,v,p: 53% 20% 19% 8%
  
  [libx264 @ 04c748e0] Weighted P-Frames: Y:0.4% UV:0.0%
  
  [libx264 @ 04c748e0] ref P L0: 63.9% 19.2% 11.1% 5.7% 0.0%
  
  [libx264 @ 04c748e0] ref B L0: 90.4% 9.0% 0.6%
  
  [libx264 @ 04c748e0] ref B L1: 97.8% 2.2%
  
  [libx264 @ 04c748e0] kb/s:1649.69

  So How can I Fix my "picture" video ?
  Will it fix the freeze problem after concatenation of videos ?
  If not How can I fix it ?
  

  Thanks in advance !
  

• How to get stream info from opened file in ffmpeg ?

  31 mai 2013, par Srv19

  I am trying to read video file using ffmpeg. I had working code that corresponded to somewhat old version of it, and started to try and upgrade to latest build version, exchanging all those deprecated functions for their actual analogues.

  However i have run into a problem. No streams seem to be retrieved and the load of video stops dead in tracks.

  here is the code i am using :

     // Open video file
  
     if(avformat_open_input(&pFormatCtx, filename.toStdString().c_str(), NULL, NULL)!=0)
  
         return FILE_NOT_OPENED; // Couldn't open file
  
  
  
     // Retrieve stream information
  
     if(avformat_find_stream_info(pFormatCtx,NULL)<0)
  
         return NO_STREAM_INFO; // Couldn't find stream information
  
  
  
     // Dump information about file onto standard error
  
     av_dump_format(pFormatCtx, 0, filename.toStdString().c_str(), false);
  
  
  
     // Find the first video stream
  
     videoStream=-1;
  
     for(unsigned i=0; inb_streams; i++)
  
         if(pFormatCtx->streams[i]->codec->codec_type==ffmpeg::AVMEDIA_TYPE_VIDEO)
  
         {
  
             videoStream=i;
  
             break;
  
         }
  
     if(videoStream==-1)
  
         return OTHER; // Didn't find a video stream
  
  
  
     // Get a pointer to the codec context for the video stream
  
     pCodecCtx=pFormatCtx->streams[videoStream]->codec;
  
  
  
     // Find the decoder for the video stream
  
     pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  
     if(pCodec==NULL)
  
         return CODEC_NOT_FOUND; // Codec not found
  
  
  
     // Open codec
  
     if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)
  
         return CODEC_NOT_OPENED; // Could not open codec

  The problem arises in the cycle through video streams in ffmpeg::AVFormatContext *pFormatCtx. nb_streams field is 0, and i never actually enter the cycle, and codec is not loaded etc. Strange thing is, av_dump_format gives following output :

  License: GPL version 3 or later
  
  AVCodec version 3606372
  
  AVFormat configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
  [asf @ 004e9540] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, asf, from 'C:/Users/Public/Videos/Sample Videos/Wildlife.wmv':
  
    Metadata:
  
      SfOriginalFPS   : 299700
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
      title           : Wildlife in HD
  
      copyright       : В© 2008 Microsoft Corporation
  
      IsVBR           : 0
  
      DeviceConformanceTemplate: AP@L3
  
    Duration: 00:00:30.09, start: 0.000000, bitrate: 6977 kb/s
  
      Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, 2 channels, fltp, 192 kb/s
  
      Stream #0:1(eng): Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1280x720, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc

  and there are 2 streams, clear as day.

  I am utterly baffled. Please help.

• Video Conferencing in HTML5 : WebRTC via Web Sockets

  14 juin 2012, par silvia

  A bit over a week ago I gave a presentation at Web Directions Code 2012 in Melbourne. Maxine and John asked me to speak about something related to HTML5 video, so I went for the new shiny : WebRTC – real-time communication in the browser.

  Presentation slides

  I only had 20 min, so I had to make it tight. I wanted to show off video conferencing without special plugins in Google Chrome in just a few lines of code, as is the promise of WebRTC. To a large extent, I achieved this. But I made some interesting discoveries along the way. Demos are in the slide deck.

  UPDATE : Opera 12 has been released with WebRTC support.

  Housekeeping : if you want to replicate what I have done, you need to install a Google Chrome Web Browser 19+. Then make sure you go to chrome ://flags and activate the MediaStream and PeerConnection experiment(s). Restart your browser and now you can experiment with this feature. Big warning up-front : it’s not production-ready, since there are still changes happening to the spec and there is no compatible implementation by another browser yet.

  Here is a brief summary of the steps involved to set up video conferencing in your browser :

  1. Set up a video element each for the local and the remote video stream.
  2. Grab the local camera and stream it to the first video element.
  3. (*) Establish a connection to another person running the same Web page.
  4. Send the local camera stream on that peer connection.
  5. Accept the remote camera stream into the second video element.

  Now, the most difficult part of all of this – believe it or not – is the signalling part that is required to build the peer connection (marked with (*)). Initially I wanted to run completely without a server and just enter the remote’s IP address to establish the connection. This is, however, not a functionality that the PeerConnection object provides [might this be something to add to the spec ?].

  So, you need a server known to both parties that can provide for the handshake to set up the connection. All the examples that I have seen, such as https://apprtc.appspot.com/, use a channel management server on Google’s appengine. I wanted it all working with HTML5 technology, so I decided to use a Web Socket server instead.

  I implemented my Web Socket server using node.js (code of websocket server). The video conferencing demo is in the slide deck in an iframe – you can also use the stand-alone html page. Works like a treat.

  While it is still using Google’s STUN server to get through NAT, the messaging for setting up the connection is running completely through the Web Socket server. The messages that get exchanged are plain SDP message packets with a session ID. There are OFFER, ANSWER, and OK packets exchanged for each streaming direction. You can see some of it in the below image :

  

  I’m not running a public WebSocket server, so you won’t be able to see this part of the presentation working. But the local loopback video should work.

  At the conference, it all went without a hitch (while the wireless played along). I believe you have to host the WebSocket server on the same machine as the Web page, otherwise it won’t work for security reasons.

  A whole new world of opportunities lies out there when we get the ability to set up video conferencing on every Web page – scary and exciting at the same time !