Pierre: >From your last 2 emails and tests as compared to what I see, I am thinking that the graphics board is the bottleneck. Doing similar tests with the Clowns, as compared with your observations below, I am always getting close to 29.97 fps in either X11 or X11-OpenGL. The reason I think it is probably your graphics board is because my laptop is not really a "work" computer but rather a "gaming" computer (it was an inexpensive AMD computer that has never, ever played a single game!) so I would imagine the graphics board is meant to be pretty good.
The results of these tests of the mpeg proxies tell me that with both > the X11-OpenGL driver and the X11 driver, using vdpau results in a very > slight reduction in the use of my CPU, but that this does not improve > the frame rate possible that these video drivers allow to display... > The above seems to indicate that the graphics board does not improve anything and you have plenty of CPU anyway, so you might as well use that. > > X11 allows in all cases to display at least 29.97 frame/sec sources that > have been shot at this speed. > > X11-OpenGL is always limited to a maximum of about 12 frames/sec. > > These results are approximately true for all the types of media I > tested, whether DNxHD.mov, HDV (MPEG-2.m2t), AVC H264.mp4 or even > proxies in mpeg.mpeg. > > Given these results, I don't really see the advantage of using > proxies... In any case, the video driver used will determine the > possible frame rate regardless of the type of media used. > > I'm actually wondering if the constant frame rate limit of 12 frames/sec > provided by X11-OpenGL in my tests with 4 mixers, regardless of the > media type, doesn't actually indicate a bug somewhere or a limit > inherent in my equipment. But then how do you explain the best > throughput with X-11? > Instead of working with 29.97 fps media, I loaded Big Buck Bunny which is 60 frames per second. And there may be something strange going on as Pierre indicated that I will have to test on a faster computer. Because when I played this, like Pierre, it seems to limit it at always 30 fps whether I user X11 or OpenGL. Then when I proxy it to 1/2, I thought I should have improved the frame rate but it too was at only 30 fps. I will have to do the tests on GG's computer to eliminate the possibility of a limitation / bug. Phyllis
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