Fix a deadlock that can happen with p-to-p encoding

With p-to-p, the audio sync thread waits for the video sync thread to
reach the designated start point.  There is a possibility that the video
decoder will drop so many frames that the audio sync fifo fills before
any frames reach the video sync thread.  When this happens, drop some
audio to unplug the pipeline.

Also, to make this less likely to happen, start sending data to the video
decoder 2 seconds before the actual desired start point.  This will allow
the decoder to find an initial i-frame before the audio stalls since the
audio sync thread drops any audio that is before the designated start point.
A side effect of this is our start time now more accurate since the decoder
is only dropping frames before the start point instead of after.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@3917 b64f7644-9d1e-0410-96f1-a4d463321fa5

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