video playback problem

[Mr_P]

yes - i would expect those results:
8 layers of 1920x1080 at 25fps AIC aprox 70Mb/s PLOnceFW without (no) audio

When playing video ONLY - everything gets rendered on the graphics card as catalyst prioritises video - so it should be smooth.

When playing AUDIO - that layer doesn't get rendered on the graphics card - because catalyst has to prioritises the audio - which is much more processor intensive.

To make it easier for the processors to cope with audio - it is best to render the audio+video as a small 16x16 movie file (AIC / ProRes) and make it all black

then you can sync the video only playback (on one layer) to the audio+video file playback (on another layer) using SyncID playmode on the video only layer
note: - you don't even have to assign the audio layer to an output/mix in this scenario

S

[samsc]

everything always gets rendered to the graphics card-

its the playback frame rate that changes-
with audio you have to playback at the movie frame rate-
which does not match the screen refresh rate -

yes - i would expect those results:
8 layers of 1920x1080 at 25fps AIC aprox 70Mb/s PLOnceFW without (no) audio

When playing video ONLY - everything gets rendered on the graphics card as catalyst prioritises video - so it should be smooth.

When playing AUDIO - that layer doesn't get rendered on the graphics card - because catalyst has to prioritises the audio - which is much more processor intensive.

To make it easier for the processors to cope with audio - it is best to render the audio+video as a small 16x16 movie file (AIC / ProRes) and make it all black

then you can sync the video only playback (on one layer) to the audio+video file playback (on another layer) using SyncID playmode on the video only layer
note: - you don't even have to assign the audio layer to an output/mix in this scenario

S