Newest 'ffmpeg' Questions - Stack Overflow

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• i have made a c pogram that uses FFMPEG and i corectly reached DCT coefficients of I frames BUTi donot know how o handle them

  12 septembre 2012, par Saddam

  i have made a c++ pogram that uses FFMPEG and i corectly reached DCT coefficients of all I frames. BUTi donot know how o handle them after dct_coeff as a pointer to short , what is the size of this array so that i can iterate it

  regards

• Setting bitrate of ffmpeg of output video

  12 septembre 2012, par Kami Shangool

  I'm trying to re-encode a MP4 in a different bit rate, using ffmpeg 0.8.* with the command:

  ffmpeg -i orig.mp4 -vcodec libx264 -coder 0 -bf 0 -qmin 10 -qmax 29 -acodec libfaac -async 20 -b 256k -ab 64k -vf -y t.mp4
  

  But the output video has the original bit rate of: 2908 kb/s Any idea how I can get ffmpeg to honor the video bit rate flag?

• encryting video essence using ffmpeg files

  11 septembre 2012, par Vikas Gupta

  I want to create a encrypted mxf file using ffmpeg. can any one tell me how to encrypt an avi/mpeg file using ffmpeg and save it to mxf format.

  Thanks Vikas

• Compiling ffmpeg for iOS 5.1

  11 septembre 2012, par Vlad Bogdan

  I followed jold's steps from here:

  problem compiling ffmpeg for iFrameExtractor

  When i try jold's solution i get the following error for armv6 and armv7. i386 works perfect.

  lipo: can't open input file: armv6/libavcodec.a (No such file or directory)

  lipo: can't open input file: armv6/libavutil.a (No such file or directory

  lipo: can't open input file: armv6/libswscale.a (No such file or directory)

  When the script ends i have only libadevice.a and libavformat.a in /armv7 and /armv6.

  Why?

• How to extract frame from video and save it into memory ?

  11 septembre 2012, par Alrick

  I tried extract frame and save it as output.jpg On server side:

  f = "ffmpeg -vframes 1 -y -ss "+time+" -i ./media/somemov.mp4 ./media/output.jpg"
  subprocess.call(f, shell=True)
  

  And on client side used:

  getImage(noOfFrame);  //send the request for call the ffmpeg function from views.py
  
  document.getElementById("main").style.backgroundImage="url(http://localhost:8000/media/output.jpg#"+ new Date().getTime();+")";
  

  But its too slow. DIV displays always the old image becose creates image takes a long time. for example i want image no 3 and DIV has no 2, i want image no 4, and div has no 3.

  Is there any way how to extract frame from video (by ffmpeg) and send it into Python without creation the output.jpg file?

  I want get the image data and send it from server (django) to webpage and set it as background-image of any DIV.

  Is the "pure data sending" solution better then mine?

  Thanks for help.