make the delta magnitude a user specifyable parameter:

-dts_delta_threshold.
patch by Harikrishnan Varma < hvarma AH divxcorp POIS com >
Original thread:
Date: Mar 14, 2006 1:13 AM
Subject: [Ffmpeg-devel] Audio-video sync problem when transcoding to
xvid in AVI

Originally committed as revision 5166 to svn://svn.ffmpeg.org/ffmpeg/trunk