If you are trying to display at 30 fps and your refresh rate is
not a multiple of 30 Hz, it's going to beat. The XvShmPutImage
requests are synced to the vblank, hence they aren't displayed when
you make the call but the next retrace after that.
Also, there are alot of busy stuff going on with modern desktop
managers. I wouldn't trust the result unless you got the same behavior
without a window manager. That little throbbing "!" on the toolbar
of one of the desktops is the worst.
Mark.
On Fri, 23 Jan 2004, Howard Page wrote:
> Folks,
>
> I need some help. I'm using the Xvideo option to play video with vlc
> (www.videolan.org). The playback is shows some jerkiness.
>
> I've taken xvinfo.c and hacked it up to display several images at 30
> frames/second such that one sees a blue bar moving horizontally across
> the screen. One can chose a mode to display the images at normal 30
> frames/second or one where 3:2 pull down is simulated (i.e one image is
> displayed for 33ms, the next for 42ms).
>
> You'll notice that the playback is jerky in both modes, but in 3:2 pull
> down mode it is especially jerky. Would anyone know how to address this?
>
> The goal is to somehow get mpeg2 video to playback in a non-jerky mode.
>
> I'm using RH9, nvidia geforce2 with the nvidia drivers. Thanks!
>
> Test code is attached.
>
> Regards,
>
> Howard G Page
>
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