- Always use HandBrake's DTS decoder rather than ffmpeg's even for inputs we read...

 - Always use HandBrake's DTS decoder rather than ffmpeg's even for inputs we read via ffmpeg so that we get the user-specified mixdown. Otherwise we eventually abort in the sample rate converter or audio encoder.
 - Teach HB's DTS coder to handle implicit timestamps so that it doesn't screw up on mkv's & some m2ts inputs.
 - mkv's produced from Bluray HD content seem to have large timestamp errors - filter them out in the decoder so that sync doesn't drop big chunks of our audio.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@1904 b64f7644-9d1e-0410-96f1-a4d463321fa5