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• FFMPEG avcodec_find_decoder(2) (CODEC_ID_MPEG2VIDEO) always returns incomplete AVCodec ?

  22 octobre 2012, par Passer

  I got a problem with FFMPEG (avcodec-54.dll)
  1) I wrote a .NET wrapper. As far as I can see it works well.
  2) I try to decode something... and thats were the problem is :

  ...
  
    FFmpeg.avcodec_register_all();
  
  
  
    pAVCodec = FFmpeg.avcodec_find_decoder(CodecID.CODEC_ID_MPEG2VIDEO); //which is in int 2
  
    Console.WriteLine("CodecID " + (*pAVCodec).id);
  
    Console.WriteLine("CodecType " + (*pAVCodec).type);
  
    Console.WriteLine("CodecName " + (*pAVCodec).name);
  
  ....

  ---

  No EXC was thrown and the following output came :
  

  CodecID CODEC_ID_NONE
  
  CodecType 1790854254
  
  CodecName mpeg2video

  ---

  What confuses me the most is that the name is correct, but the id and type are wrong.
  In the previous Version if the DLL everything works fine. This behaviour came up with the new version.
  Any guesses or debugging tips ?

• FFmpeg, overlay, black detect, intermission — too much to ask ?

  11 avril 2016, par Timo Mika Gläßer

  I have two streams (see the schematic in the picture below). One is the main video-stream which is constantly on and one is a picture-in-picture stream which have intermissions. Both are fed to ffmpeg as live streams and I want to redistribute them as a merged live stream again.

  Is there a way to either have a static image for the picture-in-picture stream when it has no data (i.e. using blackdetect) or completely hiding it temporarily ?

  

• How can I add "retro-looking" black round cornert to my videos ?

  4 mars 2020, par user3018558

  I’m looking to add (e.g. overlay) some retro/cinematic effect to my video and specifically the black rounded corners.
  Can this be achieved via ffmpeg ? I’m actually using Handbrake mainly but since it relies on ffmpeg I guess I could pass something as a parameter in Handbrake’s Video/Advanced/options to affect the output file ?

  I mean one option would be to add an overlay I guess like :
  

  But considering the input files have different resolution/aspect-ration I would ideally be looking to have this dynamically added to the output file.

  Any idea/tip ?

  Thanks