If deinterlacing were to be turned off by default a lot of users would
experience poor video playback "out of the box" and it is unlikely that
they would know what to do to fix it.

This high CPU use will be solved in time as support for GPU accelerated
video decoding such as XvMC (X-Video Motion Compensation), VDPAU (Video
Decode and Presentation API for Unix) and VA-API becomes more
widespread.  For those not familiar with the Linux video APIs and
extensions, XvMC is capable of offloading the video decoding of motion
compensation and iDCT (inverse discrete cosine transform) work to the
GPU for MPEG-2 video files. VDPAU supports motion compensation, iDCT,
VLD, and deblocking, but for many more formats. The supported VDPAU
formats include up through MPEG-1, MPEG-2, MPEG-4 ASP, H.264 / AVC,
VC-1, and WMV9, but some video hardware is not capable of supporting all
formats.

For example software implementations see
http://www.phoronix.com/scan.php?page=news_item&px=Njg4Ng and
http://www.phoronix.com/scan.php?page=news_item&px=ODUzOQ

For info on the underlying benefits which can be supported/used by any
software see http://www.phoronix.com/scan.php?page=news_item&px=ODEwNg
(this was indeed merged in to the 2.6.35 kernel) and
http://www.phoronix.com/scan.php?page=news_item&px=ODcxOA

-- 
deinterlacing is default
https://bugs.launchpad.net/bugs/667514
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