[Bug 260898] audible skips and video jitter during video playback

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260898

--- Comment #15 from Bob Frazier <bobf@mrp3.com> ---
Using the 'workaround' settings I have occasionally seen problems in video
playback.  The problems are MUCH less frequent but have not completely been
resolved.

In one case a video suddenly went 'out of sync' between sound and video, and
shortly afterwards a different video suddenly stopped playback several secones
before the end.  I have not seen this happen before nor since.

I have also seen one case of bad audio playback distortion, coupled with a
stall in video playback, specifically the kind of audio distortion that sounds
as if 0.1 seconds of audio is being repeated for over 1 second... like a
"raspberry" sound.  (this was common without the workaround).

So if the problem is related to timing events in video playback, then a problem
that occasionally causes severe timing errors is still there.

Using sysutils/nbosd I occasionally check CPU frequency and most of the time
the freq seems to be staying at 1550Mhz since the system is mostly idle.

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