On some distros, avconv isn't available yet.
This fix adds a fallback to ffmpeg.
When none is found, no error message is displayed in the console any
more.
Fixes#5745
Also, this now uses exec() instead of shell_exec() to be able to get the
return code.
The binary path found with "which" is now used to prevent further FS
binary lookup when running the commands.
Moved the "-ss" parameter before "-i" for ffmpeg.
Vincent Petry
Georg Ehrke
Thomas Müller