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• FFmpeg How to write video to a file

  9 décembre 2014, par NoviceAndNovice

  What i want is

   1. Get video packet from stream source
  
   2. Decode it
  
   3. And write  that decoded data as video file(avi, mpeg etc)

  I can able to get video Packets from a file (as AVPacket) and also can decode and save as an image.(raw)( FFmpeg tutorials show how to do it).
  But i can not ( do not know ) write that video data to a file(other) which can be played by media players(such as VLC).

  Best Wishes

  Ps : Real code samples will be great if possible...

  Now i make test with av_interleaved_write but i got strange error "non monotone timestamps" ( i have no control over pts values of media source )

  Some Extra Info

  In FFmpeg I have to

  1. Read media packets from media source ( it may be real file(.avi,mov) or even rtsp server).
  2. Then write those media packets to a real file (physical .avi, .mov etc file)

  I need reader and writer. I can read the media source file ( even encode packets according to given format). But i can not write to file...(which any player can play)

  And some pseudoCode

  File myFile("MyTestFile.avi");
  
  
  
  while ( source ->hasVideoPackets)
  
  {
  
       packet = source->GetNextVideoPacket();
  
       Frame decodedFrame = Decode(packet);
  
       VideoPacket encodedPacket = Encode( decodedFrame);
  
       myFile.WriteFile(encodedPacket);
  
   }

  Or Just write the original file without encode decode

       File myFile("MyTestFile.avi");
  
  
  
       while ( source ->hasVideoPackets)
  
       {
  
           packet = source->GetNextVideoPacket();
  
           myFile.WriteFile(packet);
  
       }

  Then

  I can able to open MyTest.avi file with a player.

• How to combine multiple ffmpeg streams into a single 4x4 collage ?

  16 mars 2013, par CoryG

  I have a server with 16 video capture card channels coming into it and want to stream them with ffmpeg, is it possible to have another stream going out that is a 4x4 collage of the 16 unique channels ?

  Edit : Adding a bounty since no working answer has been submitted yet - will reward it to the first one that can show the code to produce a 4x4 grid of 16 live channels (input device being http:// localhost:8090/x.mpg where x= a number 0-15, 352x288 video in MPEG1VIDEO format, YUV420P color at 24-30FPS) - or code that leads me to that solution - the output will be located at http:// localhost:8090/all.mpg and will be a 1408x1152 mpg live stream.

• Using FFPlay in a mac Application

  16 mars 2013, par Anand

  -I am working on a mac application that needs a video area in a part of the App.

  I see that we have a ffplay static library here - which is a UNIX executable - http://www.evermeet.cx/ffplay/

  I included that in my project - But now do i specify a NSView or something to show the Video using ffplay