I've been playing around with these values and have discovered the following
(I only have SD channels - none HD) when replaying recordings.

Setting engine.buffers.audio_num_buffers to 2300 (10x default) does help
with the skips in audio - where under the default value (230) I
intermittantly get 2-3 second jumps in audio.

#engine.buffers.video_num_buffers is left at the default of 500. If I set
this any higher, fast forwarding or rewinding causes the video to jump about
90 seconds.

engine.buffers.video_num_frames (default 15) I've had to set to 60. Anything
less than this seems to make the video jump 2-3 seconds, in line with the
audio_num_buffers described above. With this set to 60, there's no lost
audio but video/audio still gets out of sync, and it gets worse and worse
for 20 seconds then the audio stops and the video catches up. Also with
anything <60, I get PPPPPPPP on the vdr console when replaying recordings.

What video card/driver do you use?  I know of another guy with similar
problems but with my Nvidia 8400GS using vdpau it works fine with just
default settings.  I've never had to adjust anything.

Card is a NVIDIA GPU GeForce 8400 GS too, but I'm not using the vpdau - as I currently have no HD or H.264 content.

Do you think I should change to vpdau anyway??

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