[mythtv] Ticket #15/#904 - Fallback to onefield deint for non-1x speeds

Robert Johnston anaerin at gmail.com
Sat Feb 25 23:41:15 UTC 2006

On 2/25/06, Louie Ilievski <loudawg at comcast.net> wrote:
> I was playing around with some de-interlacing settings recently and went back
> to using Bob for a while when I noticed that when adjusting my timestretch,
> bob turned into onefield.  I thought this was a bug and confirmed this was
> the behavior by examining my logs, but before I posted to trac I found
> tickets 15 and 904 regarding this issue.  It seems this is intentional
> behavior.  Is this desireable?  It seemed a while ago even when adjusting
> timestretch the picture looked consistent.  Now, especially noticable in
> cartoons, when I bump up my timestretch, I get jaggies.  Going back to 1x
> gives me a nice picture again.
> So, is Bob just not capable of running at higher than 1x?  I can see good
> reason for switching to onefield when fast forwarding, but it seems for
> actually watching your show at say 1.2x, your de-interlace setting is not
> being honored.

IIRC, Bob requires the video to run at 2x, so it can display each
field in it's entirety. That's fine when running at 1x, 60Hz (Which
gives you both full frames deinted), but if you change that (1.1x
60Hz) it means the bob can't keep up.

TBH, though, I was under the impression you were better off using KernelDeint.
Robert "Anaerin" Johnston

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