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• How to queue ffmpeg FIFO

  29 avril 2013, par Francois

  we build a service similar to youtube. Also converting runs fine with ffmpeg using this script from another post here :

  How do I set up an ffmpeg queue ?

  #!/bin/bash
  
  
  
  pipe=/tmp/ffmpeg
  
  
  
  trap "rm -f $pipe" EXIT
  
  
  
  # creating the FIFO    
  
  [[ -p $pipe ]] || mkfifo $pipe
  
  
  
  while true; do
  
  # can't just use "while read line" if we 
  
  # want this script to continue running.
  
  read line < $pipe
  
  
  
  # now implementing a bit of security,
  
  # feel free to improve it.
  
  # we ensure that the command is a ffmpeg one.
  
  [[ $line =~ ^ffmpeg ]] && bash <<< "$line"
  
  done

  This works pretty good when i send one by one to the named pipe. When i send more than one at same time the second one queues the terminal to the point the first one finished. if a try more than 2 the third one will not be transcoded.

  So i tried to workaround with background sending to get the terminal free (just drop the echo command and close the ssh connection) but this doesn't work, then i played around with screen -X but also no luck. Maybe someone has a good idea to deal this.

  What i wanna do is : Every uploaded video which is needed to transcode will send a echo to the named pipe. FIFO should match but not blocking the terminal. So i think i need something to really queue ffmpeg input.

  kindest regards
  Francois

• Revision ac980b71cf : Improve sign consistency. Fix warning on windows : signed/unsigned mismatch on l

  23 avril 2013, par Johann

  Changed Paths :
   Modify /vp9/vp9_dx_iface.c

  
  
  Improve sign consistency.

  Fix warning on windows : signed/unsigned mismatch on lines 415, 454

  Comparison was between size_t data_sz >= int index_sz on 415 and
  unsigned int data_sz >= int index_sz on 454. Both might be changed to
  size_t but that would be tracing and replacing all comparisons is
  outside the scope of this change.

  In the rest of these two functions ensure unsigned values are used
  consistently.

  Change-Id : I922b399ceca612a92f44b9d1d331c1c6bae9d768

• Using FFMPEG to losslessly convert YUV to another format for editing in Adobe Premier

  17 octobre 2013, par Wolfman's Brother

  I have a raw YUV video file that I want to do some basic editing to in Adobe CS6 Premiere, but it won't recognize the file. I thought to use ffmpeg to convert it to something Premiere would take in, but I want this to be lossless because afterwards I will need it in YUV format again. I thought of avi, mov, and prores but I can't seem to figure out the proper command line to ffmpeg and how to ensure it is lossless.

  Thanks for your help.