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• new ffmpeg_movie() not working anymore after changing host

  30 juillet 2014, par user2526873

  We have developed some short movies processing website. The previous host removed the ffmpeg support, so we changed the hosting provider. They support ffmpeg, the extension is loaded, my script hasn’t change. Though, this part is not working anymore :

  $movie = new ffmpeg_movie($uploadFile); 
  
  $length = $movie->getFrameCount();

  The length is 0, but there and I get no errors in the log and this happens with every file I use ffmpeg_movie on.

  What can I do ?

  Thank you in advance for the help !
  Angela

• How can I use the blackframe filter in ffmpeg to only encode images above a certain threshold ?

  8 août 2012, par andyroo

  I am using ffmpeg to make timelapse movies from still images.

  I see that I can use the blackframe filter to get a list of dark frames in a video, but I would like to skip encoding those frames all together.

  Is there a way that I can use the blackframe filter to avoid encoding frames below the blackframe threshold ? Ideally I would be able to do this on a Win7 machine using batch/powershell/python.

  Using another open source program to remove/delete black frames first would be acceptable too.

• Is there a set of working P/Invoke declarations for FFMpeg, libavutil, libavformat and libavcodec in .NET ?

  11 février 2014, par casperOne

  I'm currently looking to access libavutil, libavformat and libavcodec (all part of FFMpeg) from .NET.

  Currently, I'm getting the libraries from the automated builds of the shared FFMpeg package performed every night for Windows 32-bit.

  I am also using the code from the ffmpeg-sharp project. In that project, I have removed a number of classes that were not compiling (they are wrapper classes not the P/Invoke declarations).

  The code compiles fine, but I am running into a few issues.

  First, it appears that the build of av*.dll uses the cdecl calling convention, as I was receiving a number of PInvokeStackImbalanceException when trying to call av_open_input_file. This was easy enough to change to get it to work right. The AVFormatContext structure is populated.

  After that, I want to call av_find_stream_info to get information about the streams in the file. However, when calling that with the AVFormatContext retrieved from the call to av_open_input_file, an AccessViolationException is thrown indicating that I am trying to read or write from protected memory.

  Has anyone used P/Invoke to access the libavutil, libavformat and libavcodec dll libraries through P/Invoke and have gotten it to work ?

  I should mention that working with the command-line version of FFMpeg, while a solution, is not a viable solution in this case, access needs to occur through the libraries. The reason for this is that I'd have to thrash the disk way too much to do what I need to do (I have to do a frame-by-frame analysis of some very high definition video) and I want to avoid the disk as much as possible.