[mythtv] OSD Rendering Resolution

David Asher asherml at gmail.com
Wed Apr 11 19:41:06 UTC 2007

If you use the ChromaKey OSD as a side-effect the OSD is rendered @ screen
resolution.  Look in the wiki for how to use it.

Unfortunately, this has its own issues (beynond whether your hardware is
compatible), like DVD menu overlays are off by a bit because of the scaling
operations required to "find" the upscaled DVD images.


On 4/11/07, Will <potsofdirt at yahoo.com> wrote:
> Please forgive me if this has been discussed before, however I was not
> able to find mention of it in the dev list.
> One feature I would love is to have the OSD rendered at my screen
> resolution rather than the recording source resolution. I run a monitor
> (1600x1200 dfp) for my display and find the OSD to be quite fuzzy (source is
> 640x480). From what I have read the OSD is rendered at the same resolution
> as the source, so if I had HD content the OSD would look nicer.
> I would like to try and play around with adding this feature, however I
> expect there is some technical detail holding it back. Does anyone have any
> insight into if this is possible, and if so, where would be a good place to
> start looking in the code.
> From what I can tell lib/libmythtv/ seems to contain a good amount of OSD
> code which include details about the QRect that the OSD is drawn on. Is
> there a technical restriction that doesn't allow the OSD to use alpha
> transparency with the video signal if it is rendered at a different res?
> Thanks for any comments or help!
> --Will
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