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• Merge two or more video files of any format using FFmpeg in iPhone

  20 juillet 2012, par Subhash

  Is there any direct command in FFmpeg to merge videos in iPhone. I need to do this programmatically by setting the command line argument to the FFmpeg containing the input movie files to merge and the output file name.

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  I just wanted to merge two .mov movie files using FFmpeg. I was trying to do this in iPhone where I was creating a command line argument containing two video fies to merge as an input parameter and the destination video file as output parameter and then calling main method of FFmpeg. But for merging videos using FFmpeg first we need to convert it to mpg format and then pass the movie files in mpg format in the command line format. This is the only way found to merge the video using FFmpeg as far as I know. Is there anybody out there done this in a different way ?

• ffmpeg slideshow piping input and output for image stream [migrated]

  21 avril 2013, par charly

  I am trying to make from a list of images a video and then I will directly upload it.
  I have managed so far to create a video for the images with :

  cat *.jpg | ffmpeg -r 1 -f image2pipe -vcodec mjpeg -i - foo.mp4

  It works well and I'm happy with it. However, now I would like to pipe the output and I can't really manage to do this. I've tried a couple of like :

  cat *.jpg | ffmpeg -f image2pipe -r 1/5 -vcodec mjpeg -i - pipe:1 | cat > p.mpeg

  (for the moment I would just like to pipe back in a file just to test and then I'll had the direct upload).

  I've read in another thread that I should specify the output format which makes sense as the error returned by ffmpeg is "Unable to find a suitable output format for 'pipe:1'". However, all I can find in the doc is :

  -f fmt (input/output)
  
  Force input or output file format. The format is normally auto detected 
  
  for input files and guessed from the file extension for output files, 
  
  so this option is not needed in most cases.

  How can I specify the output format and the input format ?

• checkasm : h264dsp : Initialize the padding area

  27 juin 2016, par Martin Storsjö

  checkasm : h264dsp : Initialize the padding area
  This fixes valgrind warnings about conditional jumps based on
  
  uninitialized data (even though the uninitialized data only ever
  
  was compared with a direct copy of the same uninitialized data).
  Signed-off-by : Martin Storsjö <martin@martin.st>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] tests/checkasm/h264dsp.c