Default for avconv setting on 18.04 wrong

[Wolfgang Merkt]

Relates to #92 and #94.

#94 added the ability to configure avconv to be ffmpeg or whatever we want. However, in the robotpkg distributed viewer, it still points to avconv on 18.04 by default - it is now ffmpeg again. Can this be fixed in the distributed version?

[Julian Eßer]

This seems to be somehow related to an error I currently receive. When trying to record a movie of the crocoddyl example bipedal_walking.py in the gepetto viewer, it fails with the following log:

Failed to start avconv. Either it is missing, or you may have insufficient permissions to invoke it. 

You can manually run avconv -r 25 -i /tmp/gepetto-gui/record/img_0_%d.jpeg -vf scale=trunc(iw/2)*2:trunc(ih/2)*2 -r 25 -vcodec libx264 /home/###hidden###/Videos/bipedalRecording.mp4

[Joseph Mirabel]

@nim65s there are several possible workaround:

• use cmake to know what the default should be. Then, the line to change is

  gepetto-viewer/src/gui/settings.cc

  Line 49 in 0169d4b

   , avconv ("avconv") 

• otherwise, we could look for both and see if any is found.

[Guilhem Saurel]

Thanks for the heads-up, I had forgotten this.

[Joseph Mirabel]

Fixed by #119