[mythtv-users] Bob deinterlacing drops frames, but not high CPU

Lan Barnes lan at falleagle.net
Sat May 26 16:02:48 UTC 2007

On Sat, May 26, 2007 1:06 am, Matt Doran wrote:
> Lan Barnes wrote:
>> On Thu, May 24, 2007 8:08 pm, Matt Doran wrote:
>> -snippage-
>>> Once I got that working I enabled bob and opengl vsync, and the result
>>> is much smoother playback.
>>> -- Matt
>> I have to ask how this smoothness expresses itself. I'm considering
>> trying
>> bob deinterlacing because I get pixilation of large color blocks on
>> panning motion (when a runner takes off for second base, he leaves a
>> Wiley
>> Coyote blur behind himself). Is that the sort of thing your change
>> fixed?
>> Feeling much more like a mere mortal all the time ...
> :)
> This won't fix pixellation.  I think that's more likely to be problem
> with the encoding of the video stream.  It takes more bandwidth to
> transmit a video stream with more changes (like panning)..... so
> depending on the quality of the encoding and the bandwidth, it might
> cause a loss of quality and pixelation.
> The smoothness I'm talking about with getting your refresh rate to match
> the frame rate of the broadcast.  If it doesn't match, say if you're
> using 60Hz with a 25 Hz video, some frame will be duplicated... which
> results in a slightly jerky panning.  I also noticed the problem when
> credits were scrolling up the screen.

Thanks for the clear explanation. I'll save the time I would have devoted
to bob and concentrate on other of my newbie Myth issues.

Lan Barnes

SCM Analyst              Linux Guy
Tcl/Tk Enthusiast        Biodiesel Brewer

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