[mythtv-users] [SiS video: ASUS Pundit] My ongoing quest for jitter-free deinterlacing

[Jeroen Brosens]

- I want full field rate in video playback; to my knowledge, using bobdeint is the only way to achieve this; - bobdeint requires a form of vertical sync, which as far as I know the SiS driver cannot support. In my ongoing quest to find an X setup that gives me jitter-free video using bobdeint I stumbled upon a new option, found on the SiS X driver website (http://www.winischhofer.at/linuxsispart1.shtml): 2. Video blitter method This second method is only supported on the SiS M650, 651, (M)661, (M)741, 330 and (M)760, not any older chipsets. It works entirely different to the overlay method: The video blitter simply copies video data from the video application into the framebuffer (eg. a window), thereby converting the data from the video color space (some YUV format) to RGB. All this is done by the 2D acceleration engine. The following color space formats are supported: YV12, I420, UYVY, YUY2, YVYU, NV12, NV21. The maximum video source size is 2046x2046. The video blitter is only very little slower than the Xv method. However, it's worst disadvantage is that it cannot scale the video. The video will always be shown in its original size; if the video is larger than the visible screen, it will be cropped. If it smaller, a black border will be drawn. Furthermore, there are no video properties such as contrast, brightness, etc. So, when I enable this as the video output, bobdeint starts acting like it does when you give "bobdeint" as an argument to the "Custom Filters" option in the Setup > Tv Settings > Playback menu; which is splitting the screen horizontally in two halves, each displaying one field. Of course, this is due to the fact that bobdeint only works on Xv or XvMC output. Using this Video blitter method, the output comes from the framebuffer, as stated above. My experience up till now has been that the combination of SiS + Xv + bobdeint gives vertical jitter (now and then) because there is no (driver or OpenGL) Vsync support. My question: can the source code of either bobdeint or the the non-Xv video output (which one handles this?) be modified to have the screen built up correctly, that is with the fields interweaved and not split screen? Thanks, -- Jeroen

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