MacGui: harmonize audio configuration code in prepareJob and prepareAudioForJob.



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5422 b64f7644-9d1e-0410-96f1-a4d463321fa5
sync: fix a hang when the avcodec encoder for silence insertion fails to open.

This affects e.g. AAC Passthru with more than 6 channels.



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5423 b64f7644-9d1e-0410-96f1-a4d463321fa5