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• FFmpeg VP8 Decoder Implementation

  19 août 2010, par noreply@blogger.com (John Luther)

  When we started the WebM project, one of our goals was to promote rapid innovation in video technology through open development. Just two months after WebM debuted, Jason Garret Glaser, Ronald Bultje and David Conrad created a VP8 video decoder implementation for FFmpeg called ffvp8.

  The ffvp8 implementation decodes even faster than the WebM Project reference implementation (libvpx), and we congratulate the FFmpeg team on their achievement. It illustrates why we open-sourced VP8, and why we believe the pace of innovation in open web video technology will accelerate.

  

• Revision 7254 : Un début de drag’n drop à la Gmail Lors du drag d’un fichier sur le body, ...

  13 décembre 2012, par kent1 — Log

  Un début de drag’n drop à la Gmail
  Lors du drag d’un fichier sur le body, on affiche un message de dépot des fichiers sur le formulaire
  On utilise un code inspiré de ​http://antimatter15.com/wp/2010/10/gmail-style-html5-dragdrop/

• audio extracted from flv file via ffmpeg is of shorter duration than the actual flv video [closed]

  11 janvier 2013, par user1961143

  I have extracted audio from flv file via ffmpeg using this command :-

  ffmpeg -i 164_29.flv v19.mp3

  The flv videos duration is 3 minutes but the audio is of 2 mins 20 seconds only. On searching i found that the silent pieces of audio are removed when generating audio from ffmpeg. But i need the audio file to be of exactly same duration as flv video as later i need to put this audio in the flv video itself. Please help as this is urgent for our project. I am running the FFMpeg via .net windows service, so in case you know any other tool which can extract the audio of same duration as video and can be run via .net, it would be useful too.

  Console output :

  C :\Users\ritika.thakur>ffmpeg -i 164_29.flv v19.mp3
  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version —disable-pthreads —enable-runtime-cpudetect —enable-avisynth —enable-bzlib —enable-frei0r —enable-libass —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-libnut -enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger -enable-libspeex —enable-libtheora —enable-libutvideo —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libx264 —enale-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 9.100 / 52. 9.100
  libavcodec 54. 77.100 / 54. 77.100
  libavformat 54. 37.100 / 54. 37.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 23.102 / 3. 23.102
  libswscale 2. 1.102 / 2. 1.102
  libswresample 0. 17.101 / 0. 17.101
  libpostproc 52. 2.100 / 52. 2.100
  Input #0, flv, from '164_29.flv' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  Duration : 00:03:04.08, start : 0.000000, bitrate : 283
  kb/s
  Stream #0:0 : Video : flv1, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  Stream #0:1 : Audio : nellymoser, 22050 Hz, mono, flt
  Output #0, mp3, to 'v19.mp3' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  TSSE : Lavf54.37.100
  Stream #0:0 : Audio : mp3, 22050 Hz, mono, fltp
  Stream mapping :
  Stream #0:1 -> #0:0 (nellymoser -> libmp3lame)
  Press [q] to stop, [?] for help
  size= 567kB time=00:03:04.13 bitrate= 25.2kbits/s video:0kB audio:567kB subtitle:0 global headers:0kB muxing overhead 0.051503%

  This is the output of console for both video and audio file separately :-

  Microsoft Windows [Version 6.1.7601]
  Copyright (c) 2009 Microsoft Corporation. All rights reserved.

  C :\Users\ritika.thakur>ffmpeg -i v19.mp3

  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version3
  —disable-pthreads —enable-runtime-cpudetect —enable-avisynth —enable-bzlib
  — enable-frei0r —enable-libass —enable-libopencore-amrnb —enable-libopencore-
  amrwb —enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-libnut -
   enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger -
   enable-libspeex —enable-libtheora —enable-libutvideo —enable-libvo-aacenc —
  enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libx264 —enab
  le-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 9.100 / 52. 9.100
  libavcodec 54. 77.100 / 54. 77.100
  libavformat 54. 37.100 / 54. 37.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 23.102 / 3. 23.102
  libswscale 2. 1.102 / 2. 1.102
  libswresample 0. 17.101 / 0. 17.101
  libpostproc 52. 2.100 / 52. 2.100
  [mp3 @ 0056e780] max_analyze_duration 5000000 reached at 5015510
  Input #0, mp3, from 'v19.mp3' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  encoder : Lavf54.37.100
  Duration : 00:02:25.14, start : 0.000000, bitrate : 32 kb/s
  Stream #0:0 : Audio : mp3, 22050 Hz, mono, s16, 32 kb/s
  At least one output file must be specified

  C :\Users\ritika.thakur>ffmpeg -i 164_29.flv

  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version3
  —disable-pthreads —enable-runtime-cpudetect —enable-avisynth —enable-bzlib
  — enable-frei0r —enable-libass —enable-libopencore-amrnb —enable-libopencore-
  amrwb —enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-libnut -
   enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger -
   enable-libspeex —enable-libtheora —enable-libutvideo —enable-libvo-aacenc —
  enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libx264 —enab
  le-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 9.100 / 52. 9.100
  libavcodec 54. 77.100 / 54. 77.100
  libavformat 54. 37.100 / 54. 37.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 23.102 / 3. 23.102
  libswscale 2. 1.102 / 2. 1.102
  libswresample 0. 17.101 / 0. 17.101
  libpostproc 52. 2.100 / 52. 2.100
  Input #0, flv, from '164_29.flv' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  Duration : 00:03:04.08, start : 0.000000, bitrate : 283 kb/s
  Stream #0:0 : Video : flv1, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  Stream #0:1 : Audio : nellymoser, 22050 Hz, mono, flt
  At least one output file must be specified

  If you see the duration of video is of 3:04 but audio extracted from it is of 2:25 only.
  Actually i am using ffmpeg overlay to show two videos side by side in our debate project for the client. Now ffmpeg takes audio from first video by default. But we want the audio from both videos together as a debate going on. Hence I thought of a solution to extract audio from both videos and merge them and than apply them to the overlayed video. This will all work perfectly only if I get the complete audio from the video file i.e. of equal duration.
  For more information i am writing here the overlay command we are using :-

   **ffmpeg -i 164_29.flv  -vf "[in] scale=359:320, pad=2*iw+6:ih
  
    [left];    movie=164_30.flv, scale=359:320 [right]; [left][right] 
  
    overlay=365:0  [out]" -b:v 3600k -y a1.flv**
  
  
  
   **This is the console output of this overlay command:-**

  C :\Users\ritika.thakur>ffmpeg -i 164_29.flv -vf "[in] scale=359:320, pad=2*iw+6
  :ih [left] ; movie=164_30.flv, scale=359:320 [right] ; [left][right] overlay=365:0
  [out]" -b:v 3600k -y a1.flv
  ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version3
  —disable- pthreads —enable-runtime-cpudetect —enable- avisynth
  —enable-bzlib —enable
  -frei0r
  —enable-libass —enable-libopencore-amrnb —enable-libopencore-amrwb
  —enable- libfreetype —enable-libgsm —enable-libmp3lame —enable-libnut
  —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger
  — enable-
  libspeex —enable-libtheora —enable- libutvideo
  —enable-libvo-aacenc —
  enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx
  —enable-libx264 —enab
  le-libxavs —enable-libxvid —enable-zlib
  libavutil 52. 9.100 / 52. 9.100
  libavcodec 54. 77.100 / 54. 77.100
  libavformat 54. 37.100 / 54. 37.100
  libavdevice 54. 3.100 / 54. 3.100
  libavfilter 3. 23.102 / 3. 23.102
  libswscale 2. 1.102 / 2. 1.102
  libswresample 0. 17.101 / 0. 17.101
  libpostproc 52. 2.100 / 52. 2.100
  Input #0, flv, from '164_29.flv' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  Duration : 00:03:04.08, start : 0.000000, bitrate : 283 kb/s
  Stream #0:0 : Video : flv1, yuv420p, 320x240, 1k tbr, 1k tbn, 1k tbc
  Stream #0:1 : Audio : nellymoser, 22050 Hz, mono, flt
  Output #0, flv, to 'a1.flv' :
  Metadata :
  canSeekToEnd : false
  createdby : FMS 4.0
  creationdate : Tue Jan 08 00:26:19 2013
  encoder : Lavf54.37.100
  Stream #0:0 : Video : flv1 ([2][0][0][0] / 0x0002), yuv420p, 724x320, q=2-31,
  3600 kb/s, 1k tbn, 1k tbc
  Stream #0:1 : Audio : mp3 ([2][0][0][0] / 0x0002), 22050 Hz, mono, fltp
  Stream mapping :
  Stream #0:0 -> #0:0 (flv -> flv)
  Stream #0:1 -> #0:1 (nellymoser -> libmp3lame)
  Press [q] to stop, [?] for help
  frame= 83 fps=0.0 q=4.1 size= 343kB time=00:00:07.01 bitrate= 401.2kbits/s
  frame= 149 fps=149 q=2.3 size= 861kB time=00:00:14.87 bitrate= 473.9kbits/s
  frame= 223 fps=148 q=2.0 size= 1492kB time=00:00:22.00 bitrate= 555.4kbits/s
  frame= 308 fps=153 q=2.0 size= 2195kB time=00:00:28.64 bitrate= 627.8kbits/s
  frame= 391 fps=156 q=2.0 size= 2858kB time=00:00:34.06 bitrate= 687.4kbits/s
  frame= 478 fps=159 q=2.0 size= 3541kB time=00:00:39.55 bitrate= 733.4kbits/s
  frame= 547 fps=156 q=2.0 size= 4293kB time=00:00:46.80 bitrate= 751.5kbits/s
  frame= 645 fps=161 q=2.0 size= 4896kB time=00:00:51.63 bitrate= 776.8kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 16 times
  frame= 731 fps=162 q=2.0 size= 5418kB time=00:00:56.61 bitrate= 784.0kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 49 times
  frame= 794 fps=158 q=2.0 size= 5802kB time=00:01:02.37 bitrate= 762.1kbits/s
  frame= 886 fps=160 q=2.0 size= 6363kB time=00:01:07.00 bitrate= 778.0kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 29 times
  frame= 954 fps=158 q=2.0 size= 6785kB time=00:01:13.31 bitrate= 758.2kbits/s
  frame= 1056 fps=162 q=2.0 size= 7377kB time=00:01:16.94 bitrate= 785.4kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 30 times
  frame= 1130 fps=161 q=2.0 size= 7789kB time=00:01:22.19 bitrate= 776.3kbits/s
  frame= 1217 fps=162 q=2.0 size= 8372kB time=00:01:27.68 bitrate= 782.1kbits/s
  frame= 1306 fps=163 q=2.0 size= 9074kB time=00:01:32.86 bitrate= 800.5kbits/s
  frame= 1393 fps=163 q=1.6 size= 9700kB time=00:01:38.41 bitrate= 807.3kbits/s
  frame= 1475 fps=163 q=2.0 size= 10278kB time=00:01:44.03 bitrate= 809.4kbits/s
  frame= 1568 fps=164 q=2.0 size= 10825kB time=00:01:48.52 bitrate= 817.1kbits/s
  frame= 1658 fps=165 q=2.0 size= 11439kB time=00:01:53.44 bitrate= 826.0kbits/s
  frame= 1734 fps=165 q=2.0 size= 12027kB time=00:01:58.31 bitrate= 832.7kbits/s
  frame= 1792 fps=162 q=2.0 size= 12579kB time=00:02:03.41 bitrate= 835.0kbits/s
  frame= 1851 fps=160 q=2.0 size= 13284kB time=00:02:10.74 bitrate= 832.3kbits/s
  frame= 1929 fps=160 q=2.0 size= 13922kB time=00:02:16.85 bitrate= 833.3kbits/s
  frame= 2010 fps=160 q=2.0 size= 14652kB time=00:02:23.39 bitrate= 837.1kbits/s
  frame= 2102 fps=161 q=2.0 size= 15329kB time=00:02:28.86 bitrate= 843.6kbits/s
  frame= 2200 fps=162 q=2.0 size= 15963kB time=00:02:34.08 bitrate= 848.7kbits/s
  frame= 2292 fps=163 q=2.0 size= 16554kB time=00:02:38.96 bitrate= 853.1kbits/s
  frame= 2378 fps=163 q=2.0 size= 17157kB time=00:02:44.50 bitrate= 854.4kbits/s
  frame= 2468 fps=164 q=2.0 size= 17826kB time=00:02:49.50 bitrate= 861.5kbits/s
  frame= 2564 fps=165 q=2.0 size= 18489kB time=00:02:54.43 bitrate= 868.3kbits/s
  Buffer queue overflow, dropping.
  [Parsed_overlay_4 @ 0152ca80] Buffer queue overflow, dropping.
  Last message repeated 15 times
  frame= 2647 fps=165 q=2.0 size= 19079kB time=00:02:59.53 bitrate= 870.6kbits/s
  frame= 2728 fps=165 q=2.0 Lsize= 19703kB time=00:03:04.13 bitrate= 876.6kbits/
  s video:19006kB audio:567kB subtitle:0 global headers:0kB muxing overhead 0.663315%

  Everything is working fine except that we want audio from both videos playing together in final overlayed file. I would be highly grateful if you can help in this and let me know if its possible to do via ffmpeg or not.