[mythtv-users] Correctly behaving 576i (or 480i) from vdpau-capable chip?

Paul Gardiner lists at glidos.net
Thu May 27 10:05:24 UTC 2010

Jean-Yves Avenard wrote:
> Hi
> On 24 May 2010 17:51, Paul Gardiner <lists at glidos.net> wrote:
>> That's the thing, the TV is pretty high end. It has something called
>> 600Hz intelligent frame creation, which makes motion smoother than
>> I've ever seen before from a TV. (It also causes the odd artifact
>> when it gets confused, but over all it's a definite win). That
> is that the LG one? they are the only ones who dare to use the word
> 600Hz TV AFAIK...
> I would still use the Advanced 2X vdpau deinterlacers and see how it
> looks for you.. I'm sure you will be surprised.

Tried it now, and it's not as good. But I don't think this is because
of vdpau doing any worse a job of deinterlacing than the TV. I think
it's a UK specific problem. As I've mentioned before, our SD TV here,
although it is supposed to be 50i, is effectively 25p because each
frame's pair of fields aren't time separated. That's not universally
true, but the majority of transmissions are like that. So playing
that through a unit that does the deinterlacing is, I imagine,
producing pairs of identical frames, and then the TV's IFG cannot
do anything useful with it. Whereas if the original 576i is sent
to the TV, although it's still got the non-time-separated fields,
the TV can still work out what to do with it.

Also I imagine my whole liking of IFG is down to having crappy
UK 25p as the alternative. If our transmissions were true 50i
I'd probably prefer IFG turned off.

Anyway, I haven't managed to try 576i via HDMI yet. I haven't
found a way via minimyth's config to get the correct X set up.

I did manage 1920x1080p60, which strangely didn't look that bad,
although it really should have done given that all my content is
50Hz or 25Hz. I don't understand that.


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