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• Air and ffmpeg with NativeProcess

  16 mai 2013, par Pierre

  I´trying to create an Air application that can generate a movie file via ffmpeg. I´m using NativeProcess and it all works fine if (and only if) I add an ffmpeg that is compiled on my computer to the native installer. Whenever I try to use a precompiled build the process fails like this :

  NSTask : Task create for path 'mypathto/ffmpeg' failed : 22, "Invalid argument". Terminating temporary process.

  If I was the only user I wouldn´t have a problem. But I want other people to use my application so I really need to bundle the ffmpeg with my native installer.

  I have tried several different builds with the same result. Here is the argument string before I put in the process arguments Vector : "-y -f image2 -i seq%04d.png movie.mpg".

  Please help !

• EmguCV and MP4 files

  24 février 2014, par ZarakiKenpachi

  I have a very simple program for Emgu CV calling :

          Capture mMovie = new Capture("movie.mp4");
  
          Image img = mMovie.QueryFrame();

  The problem is, that I get an exception for MP4 loading.

  'System.NullPointerReference' occurs in Emgu.CV.dll, and the application is unable to create capture from movie.mp4 file.

  I've read that adding file - opencv_ffmpeg242.dll - into x86 (or x64) folder helps, I've done so and I still get an error. Anyone has experience with this ? Why is this happening, when I have the opencv_ffmpeg library there ?

  Note that video was created using ffmpeg library and I'm able to play it in different players that use ffmpeg.

• Converting DAV to MP4 and OGG

  25 décembre 2024, par mackowiakp

  I want to prepare WEB page containing films from security camera recorders. Each recorder transmit video files in DAV format so each film is converted to MP4 format by script, using such syntax :

  



  ffmpeg -y -i movie.dav -vcodec libx264 -crf 24 movie.mp4


  



  So I included in HTMLv5 code such entry :

  



   <video width="320" height="240">&#xA;  <source src="movie.mp4" type="video/mp4">&#xA;</source></video> &#xA;

  



  It works correctly with Chrome but not with Firefox. For proper work in FF it is necessary add link to OGG file. So correct HTMLv5 syntax for both browsers should look like this :

  



   <video width="320" height="240">&#xA;  <source src="movie.mp4" type="video/mp4">&#xA;  <source src="movie.ogg" type="video/ogg">&#xA;</source></source></video>&#xA;

  



  Can anybody help me to pass correct ffmpeg syntax to create OGG file ?

  



  Output from console after using -movflags +faststart options

  



  [maciek@piotr MMM]$ ../ffmpeg-2.4.2-64bit-static/ffmpeg -movflags +faststart -y -i   04.24.23-04.24.38\[M\]\[@0\]\[0\].dav -vcodec libx264 -crf 24 10.mp4
ffmpeg version 2.4.2-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2014 the FFmpeg developers
  built on Oct  9 2014 07:24:56 with gcc 4.8 (Debian 4.8.3-11)
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable- libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Option movflags not found.