[mythtv-users] Choppiness w/ transcoded digital broadcast

[Robert Tsai]

On Fri, Feb 17, 2006 at 06:58:45AM -0800, Yan Seiner wrote:
> I recorded a 1 hr long show yesterday.  It was automatically
> transcoded into 720x480 format, and everything looked fine.
> 
> I tried to watch it yesterday, but....
> 
> The show begins fine, but after about 8 minutes it begins to
> stutter.  The sound is choppy and the video is jerky.  The
> choppiness is consistent; it's as if the show was recorded at 2
> frames/sec.
> 
> The frontend is running at 25% CPU load; the backend is running at
> about 5%....
> 
> I tried various ways of fast forwarding, replaying, etc and the
> choppiness always appears at the same place, so I suspect it was
> either present in the original recording or was introduced in the
> transcoding.
> 
> Unfortunately mplayer will not play the transcoded show.
> 
> I will record another show today and keep a copy of the original
> capture to see if it is a capture issue or a transcoding issue, but
> in the meantime I am looking for ideas....
> 
> (All my tests were with short clips - 5 minutes or so - and this
> never showed up.  So I suspect a buffer fill or some sort of
> resource depletion issue...)

I occasionally have problems with my mythtranscoded HD recordings with
this "2fps" symptom you describe.

Something that often (>75%) works for me is to change the
deinterlacing; I usually alternate between Bob and Kernel de-int. I
have no idea why this works, but it does.

--Rob
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