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• How to extract images from webm video using ffmpeg

  23 octobre 2013, par Angelo N.

  I need to extract a set of images from a webm video using ffmpeg (version 0.9.2).
  I currently use this script :

  ./ffmpeg -i video.webm -r 1 -f image2 image-%04d.jpg

  but I have this error

  ffmpeg version 0.9.2, Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Oct 23 2013 12:18:47 with gcc 4.6.3
  
    configuration: --extra-libs=-ldl --disable-shared --enable-static --disable-everything --disable-ffplay --disable-ffprobe --disable-ffserver --disable-avfilter --disable-avdevice --enable-libvpx --enable-protocol=file --enable-encoder=mjpeg --enable-encoder=libvpx --enable-decoder=libvpx --enable-decoder=mjpeg --enable-parser=mjpeg --enable-muxer=webm --enable-muxer=image2 --enable-muxer=mjpeg --enable-muxer=avi --enable-demuxer=image2 --enable-demuxer=mjpeg --enable-demuxer=avi
  
    libavutil    51. 32. 0 / 51. 32. 0
  
    libavcodec   53. 42. 4 / 53. 42. 4
  
    libavformat  53. 24. 2 / 53. 24. 2
  
    libswscale    2.  1. 0 /  2.  1. 0
  
  /home/username/Desktop/out.webm: Invalid data found when processing input

  I found that in ffmpeg there isn't a webm demuxer and you can check it typing

  ./configuration --list-demuxers

  So I'm asking why ffmpeg do not support a webm demuxer which is used by libvpx (used for example in youtube by Google) .

  It sounds strange... doesn't it ?

• Live Video Streaming from android device to server [on hold]

  23 octobre 2013, par Android_sp

  hey friends i want your help

  i search a lot and study lots of code available for streaming for android but yet i can't get clear idea for me. i want simple one thing to pass stream from android device to wowza server in H.264 encoding for video and AAC for Audio.

  here some links which i already serf :

  Which not anwser :Link 1

  i also refer this most popular question from our site : Link 2

  but this useful but at some level ..

  1) Native side by using FFmpeg library i can able to send video stream but can't find a way how to encode video in H.264 format : Downloaded from here

  2) SPYdroid demo i found but from this i can send video stream to particular server :
  Downloaded from Here

  so guys if you know some thing please help me so i can find a way.

• Ruby on Rails : FFMPEG fails after upgrade Mountain Lion to Mavericks

  25 octobre 2013, par CristianOrellanaBak

  yesterday I upgrade my OS fom Mountain Lion to Mavericks and all goes well until recently.

  We are developing a Ruby on Rails v3.2.13 application for manage videos (only MP4), which worked fine until yesterday with Mountain Lion. Today (with Mavericks) I try to upload a video but get the following error in the console :

  Running transcoding...
  
  ffmpeg -y -i /Users/ME/Documents/workspace/rails/rails3-devise/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4 -ss 0 -s 180x110 -vframes 1 -f image2 -aspect 1.6363636363636365 /Users/Me/Documents/workspace/rails/rails3-devise/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.png
  
  
  
  Transcoding of /Users/Me/Documents/workspace/rails/rails3-devise/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4 to /Users/Me/Documents/workspace/railspublic/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.png succeeded
  
  
  
  Running transcoding...
  
  ffmpeg -y -i /Users/Me/Documents/workspace/rails/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4 -ss 0 -s 180x110 -vframes 1 -f image2 -aspect 1.6363636363636365 /Users/Me/Documents/workspace/rails/rails3-devise/public/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.png
  
  
  
  Failed encoding...
  
  ffmpeg -y -i /Users/Me/Documents/workspace/rails/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4 -ss 0 -s 180x110 -vframes 1 -f image2 -aspect 1.6363636363636365 /Users/Me/Documents/workspace/rails/uploads/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.png
  
  
  
  ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep 28 2013 20:09:07 with Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1/include/openjpeg-1.5 '
  
    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
  
    libpostproc    52.  2.100 / 52.  2.100
  
  [mp3 @ 0x7fd493820c00] Format mp3 detected only with low score of 1, misdetection possible!
  
  [mp3 @ 0x7fd49380a000] Header missing
  
      Last message repeated 1 times
  
  [mp3 @ 0x7fd493820c00] decoding for stream 0 failed
  
  [mp3 @ 0x7fd493820c00] Could not find codec parameters for stream 0 (Audio: mp2, 0 channels, s16p): unspecified frame size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mp3 @ 0x7fd493820c00] Estimating duration from bitrate, this may be inaccurate
  
  /Users/Me/Documents/workspace/rails/tmp/1382653048-574-3293/thumb_con02_apv_revisado_1280x720.mp4: could not find codec parameters
  
  
  
  Errors: no output file created.

  I reinstall the dependencies of ffmpeg, but the problem persists.

  Any ideas or suggestions to solve the problem ?
  Thank you very much !

  EDIT NOTE : I notice this when run brew upgrade :

  ==> Upgrading ffmpeg
  
  ==> Installing ffmpeg dependency: libass
  
  Error: libass dependency fontconfig was built with the following
  
  C++ standard library: libstdc++ (from clang)
  
  
  
  This is incompatible with the standard library being used
  
  to build libass: libc++ (from clang)
  
  
  
  Please reinstall fontconfig using a compatible compiler.
  
  hint: Check https://github.com/mxcl/homebrew/wiki/C++-Standard-Libraries