Difference between revisions of "Deinterlacing"
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*Kernel (Less Motion Blur) | *Kernel (Less Motion Blur) | ||
:This requires SSE support compiled into your Kernel | :This requires SSE support compiled into your Kernel | ||
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*One Field | *One Field | ||
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* Greedyh | * Greedyh | ||
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| + | 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 appear jumpy when the scene contains motion. | ||
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| + | *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 [http://en.wikipedia.org/wiki/Line_doubler Line Doubling] and more information can be seen here (under line doubling): [http://en.wikipedia.org/wiki/Deinterlacing#Deinterlacing_methods http://en.wikipedia.org/wiki/Deinterlacing#Deinterlacing_methods] | ||
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| + | *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. | ||
{{Note box|If using a Nvidia TV output (composite/svideo) & watching PAL/NTSC signals there should be no need to deinterlace video because the TV output's flicker filter's default setting (of 127) makes interlaced material look perfectly natural - exhibited on FX5200 svideo output - YMMV.}} | {{Note box|If using a Nvidia TV output (composite/svideo) & watching PAL/NTSC signals there should be no need to deinterlace video because the TV output's flicker filter's default setting (of 127) makes interlaced material look perfectly natural - exhibited on FX5200 svideo output - YMMV.}} | ||
[[Category:Glossary]] | [[Category:Glossary]] | ||
Revision as of 21:35, 31 December 2008
Outdated: The information on this page may no longer be relevant to the current release of MythTV, 34.0. Please consider helping to update it. This page was last modified on 2008-12-31.
MythTV Deinterlacing
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
- Greedyh
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 appear jumpy 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.
Note: If using a Nvidia TV output (composite/svideo) & watching PAL/NTSC signals there should be no need to deinterlace video because the TV output's flicker filter's default setting (of 127) makes interlaced material look perfectly natural - exhibited on FX5200 svideo output - YMMV.
