[mythtv] severe stuttering and x2 speed playback in 0.16

[martin north]

i have upgraded to 0.16 and am seeing a problem with both liveTV and 
playback. Every so often, the playback suddenly speeds up to x2 playback 
speed..with no sound. The same happens on liveTV - it suddenly jumps to a x2 
speed playback (no sound)...pauses for half a second while things catch up - 
followed by another burst of x2 speed. In both cases, the only way to stop 
it happening is to pause the playback for a second or two, and then continue 
watching. 

It seems to happen when there is a spike of corruption on the mpeg stream - 
i'm using DVB so a corruption spike is fairly common. When it happens, it 
causes the thing to appear to loose sync with the datastream.
Interestingly, the same is true when i change channel, although after about 
2-3 seconds following a channel change it normally re-sync's itself and 
stops trying to run a x2 speed. 

apologies for the slightly handwaving description of what is going on, but i 
dont have any other info. Anyone got any thoughts?? 

setup
gentoo, epia-kernel 2.4.24
xfree-epia 4.3.99.902-r4
hauupauge DVB card
using CLE266 MPEG decoder with libddmpeg-1.6