[mythtv] Feasability of using software scalers in mythtv videoout
bmayland at leoninedev.com
Wed May 10 22:45:26 UTC 2006
I'm considering the feasibility is of replacing XV's hardware scaling to
zoom video playback with what could be higher quality software scalers.
My mythtv is hooked to a display with a native resolution of 720p. I've
spent some time experimenting with various methods of getting my
recorded SD video (from a Hauppauge PVR card) onto this screen with the
best quality possible. I've tried running a 720p modeline and letting
XV scale up as well as running a 480p modeline and letting the
television scale up. Both these aren't all that fantastic. Tonight I
sat down and juked with using a software scaler to resize the video.
Here are some results, taken with a digital camera of the television (I
found this easier than doing a framegrab, I hope that's ok).
Software Resize (Lanczos)
Ignore the jpeg artifacts, the pngs were a meg each, but note how much
better picture quality you can get with the software scaler.
So if this were implemented as an option, would it be something that
would be accepted into svn? Also, other than increased CPU usage, what
other advantages and disadvantages are there? I know there is already
zoom and filter support in videoout, but this would take that one step
further I think.
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