[mythtv] [PATCH] Bob deinterlacing filter

Damon Searle djsearle at netspace.net.au
Sun Aug 8 05:21:29 EDT 2004

Thanks for doing this; I just upgraded to CVS from 0.15.1, and with the bob
deinterlacer turned on my standard definition DVB recordings are finally as
smooth as analog TV. 

Unfortunately the OSD looks pretty bad now (pixilated and flickering), but I
can't see a way of applying the OSD to the two separated frames after they
have been scaled with the way it's currently implemented. However it's a
pretty small price to pay for smooth playback.

- Damon

> -----Original Message-----
> From: mythtv-dev-bounces at mythtv.org [mailto:mythtv-dev-bounces at mythtv.org]
> On Behalf Of Doug Larrick
> Sent: Monday, 2 August 2004 4:43 AM
> To: Development of mythtv
> Subject: [mythtv] [PATCH] Bob deinterlacing filter
> The attached patch & tar file (for mythtv/filters) implements bob
> deinterlacing for Xv output method.  Bob deinterlacing shows each field
> of an interlaced frame sequentially, at twice the original framerate.
> In many ways it is ideal for outputting 1080i HDTV material.
> The approach used by the filter is to move the top field to the top half
> of the frame and the bottom field to the bottom half.  Video output then
> scales & displays the appropriate half of the frame at the appropriate
> time.
> To accomplish this goal, deinterlacing filters are now separate from the
> rest of the filter chain, and are managed by VideoOutput and its
> subclasses.  The normal filter chain continues to be managed in
> tv_play.cpp
> I have also added the ability to choose from among the four current
> deinterlacing filters in the setup GUI.
> Finally, deinterlacing will not be called on program material that is
> detected to be progressive-scan.
> I did not implement this new deinterlacing filter in dx and directfb
> output classes because I lack understanding of how they work and the
> ability to test them.  Someone with the appropriate knowledge and
> hardware could do so easily.  Note that current CVS implements bob deint
> for XvMC already.
> Sorry for the larger-than-needed patch in a few of the videoout files;
> some tabs have crept into CVS in these files.
> -Doug

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