2012-07-10, 07:13
Alright, as an update: The waveform is moving slightly faster now, but it's not much of an improvement. I can't really say what changes I've made on my system because it's been so long, but I can say that it's acting exactly the same after moving to the May milestone release.
I think I may have found the problem! Switching back and forth from DirectSound and WASAPI on the same playback device changes how fast the waveform updates dramatically. WASAPI seems to update MUCH slower than DirectSound, and according to the diagnostic info it looks like WASAPI is hovering at 30fps (though it doesn't look that way to my eye) while DirectSound is at a solid 60fps.
I'm currently rendering a comparison video between the two different modes, and looking at the preview frames DirectSound is updating at least twice as fast the whole time.
EDIT: Just opened a bug ticket: http://trac.xbmc.org/ticket/13169
EDIT 2:
Youtube video demonstration: http://www.youtube.com/watch?v=z-LT0zuAYmg
Youtube caps the video framerate at 30fps, but you can still see the difference between the DirectSound waveform and the WASAPI one. WASAPI reports 30fps, but appears to be getting something closer to 10fps.
I think I may have found the problem! Switching back and forth from DirectSound and WASAPI on the same playback device changes how fast the waveform updates dramatically. WASAPI seems to update MUCH slower than DirectSound, and according to the diagnostic info it looks like WASAPI is hovering at 30fps (though it doesn't look that way to my eye) while DirectSound is at a solid 60fps.
I'm currently rendering a comparison video between the two different modes, and looking at the preview frames DirectSound is updating at least twice as fast the whole time.
EDIT: Just opened a bug ticket: http://trac.xbmc.org/ticket/13169
EDIT 2:
Youtube video demonstration: http://www.youtube.com/watch?v=z-LT0zuAYmg
Youtube caps the video framerate at 30fps, but you can still see the difference between the DirectSound waveform and the WASAPI one. WASAPI reports 30fps, but appears to be getting something closer to 10fps.
