Deinterlacing is the process of converting traditional Interlaced Video into a Progressive Picture that can be displayed on modern non interlaced display devices such as LCD or Plasma screens.
There is a lot of general information on deinterlacing at Wikipedia in these two articles:
MythTV has several options for Deinterlacing. The configuration options for deinterlacing can be found under Mythfrontend->Utilities Setup->Setup->TV Settings->Playback. On Playback Profiles (3/9) edit each entry, The Primary and Fallback deinterlacer may be set on the 2nd sub-page.
- Linear Blend
- Kernel (Less Motion Blur)
- This requires SSE support compiled into your Kernel
- One Field
- yadif, something apparently Michael Niedermayer wrote for mplayer/ffmpeg that's fast but more CPU intensive than above
MythTV has a number of 2x deinterlacers which attempt to turn 30 Hz (or 25 Hz) interlaced video into 60 Hz (or 50 Hz) progressive video. The aim is to improve on non-2x deinterlacers which look fine for static scenes but create jumpiness when the scene contains motion.
- Bob 2X Framerate
- Shows first one field then the other scaled to the entire height of the picture. For low- or no-motion scenes Bob 2X discards half the vertical resolution of the picture.
- This requires Xv or XvMC video acceleration
- This is also called Line Doubling and more information can be seen here (under line doubling): http://en.wikipedia.org/wiki/Deinterlacing#Deinterlacing_methods
- Yadif 2X and GreedyH 2X
- Attempt to recover additional spatial information by looking forward and/or back in the video stream. GreedyH looks only at the prior field, while Yadif looks both forwards and backwards.