Comment 2 for bug 686248

Update/further info
If package x264 is removed leaving only libx264-98, the audio-desync=xx necessary for initial sync reduces to zero or one frame or so. The audio-sync drift also is much less, but still quite apparent. Noticable in an hour or two and significant beyond 3 hrs plus, getting worse over time.
The Lucid test case had both x264 and libx264-95 installed. The Lucid test case was over a 6.5hr period with some minor flucuations in sync (est a frame or two at random test times) but was still well syncronised at the end of the test period.