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Old 11-24-09, 04:59 PM   #10
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Join Date: Sep 2009
Posts: 45
Default Re: VDPAU API and implementation issues

I did some more testing about the queuing issue. It still happens with 195.22 drivers. I noticed one extra bit of information: if I use hardware decoding, AND there is no OSD/subtitle content displayed in MPlayer, then things seem to work fine even when queuing multiple surfaces ahead.

However using vdp_video_surface_put_bits_y_cb_cr() with software decoding triggers problems - VDPAU_TRACE shows VDPAU spending a lot of time blocking in that function as mentioned in my earlier post.

OSD/subtitle content also causes problems, but it seems to depend on the number of textures drawn after video mixer rendering. The problems also occur with non-changing libass subtitles that do not cause any reuploads of texture data. Basically it looks like the operations become a lot slower with frames queued ahead, and a much smaller amount of extra rendering starts causing slowdown.
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