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• Extracting N frames per second using ffmpeg

  13 juillet 2022, par Sangeeth Kumar

  ffmpeg -i input.mp4 -vf trim=10.021295:22.621295 -r 1 frames/frame_%d.png

  


  This returns 24 frames instead of 12

  


• NaCl with FFmpeg, avformat_open_input return -5 and -1052488119 [duplicate]

  30 juillet 2013, par Jar

  This question is an exact duplicate of :

  • avformat_open_input return value, error code

  I'm trying to port FFmpeg into my NaCl module.

  So far, my module linked ffmpeg and SDL libraries.

  It already can play YUV format video which is directed load into memory and copy into YUVOverlay buffer (it's very easy).

  Now, I want to use ffmpeg to decode video, but when I call the function avformat_open_input it returns -5 when input is URL string, such as rtmp:// or mmsh:// ; it returns -1052488119 when input is file name, such as /saved/tmp (I mount the file system - html5fs).

  ---

  There are some questions :

  1. What means of -5 and -1052488119 ?
  2. If file can't open by avformat_open_input, is it possible the input type is from buffer not from file name or url string ?

  ---

  If I'm not clearly about my question or description, you can tell me.
  If you are doing the same thing or having the same problem, we can discuss together.

  Thanks,
  Jar

• qt-faststart : Fix the signedness of variables keeping the ftello return values

  29 octobre 2012, par Michael Niedermayer

  qt-faststart : Fix the signedness of variables keeping the ftello return values
  These variables are assigned the return values of ftello, which
  
  returns an off_t, which is a signed type. On errors, ftello returns
  
   1, thus make sure this error return value can be stored properly.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] tools/qt-faststart.c