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• Redirecting ffmpeg result into another file

  22 juin 2015, par Enkri_

  I’m trying to get the size of an input video using ffmpeg, below is the code that I use, what I’m trying to do is to first store the result into a txt file and then do some parsing to get the size of the video :

  $ ffmpeg -i TheNorth.mp4 

  The terminal says "At least one output file must be specified"
  Then I tried this :

  $ ffmpeg -i TheNorth.mp4 result.txt

  The terminal says "Unable to find a suitable output format for ’size.txt’"

  So how could I get the result and save it to the specified file ?

• Video call between eyebeam and baresip SIP clients

  7 décembre 2012, par user1490337

  I am trying to achieve video call on 2 SIP clients

  1. Baresip
  2. Eyebeam

  Till now I have succeeded in getting audio stream both ways but the video stream is one way i.e iam getting the stream at the baresip terminal but I cannot see video at the EYEBEAM terminal. I can't understand where I am going wrong.

  The eyebeam is sending STAP-a and Fu-a packets to eyebeam as I checked it through wireshark. But baresip is not sending any STAP-a and Fu-a packets to eyebeam hence no video.. Both the clients support H.264.

  Pointers in the right direction are welcome.

• 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