Hi, Nico
Nico Sabbi wrote:
Hartmut Hackmann wrote:
So MythTV doesn't allow to choose the video format?
A solution might be to suppress the planar formats on hybrid and duo
cards.
The mechanism normally is that the application asks the driver which
formats
it supports (VIDIOC_G_FMT). We could reduce the list either
- with an insmod option
- or simply by the fact that the card supports MPEG (DVB) streaming.
But this would reduce the capabilities of the card and i don't know
whether
there are cases where only planar formats work, either due to the
application
or due to the overlay mechanism.
Can anybody comment on this?
Best regards
Hartmut
I think that removing some sample formats tout-court is a bad idea, because
resampling from yuy2 to yv12 for compressing to mpeg* is very likely to
reduce
quality and introduce slowdowns; if it were possible to remove planar
formats
only when a dvb capture is running the situation would be more reasonable;
anyway, training the user about what he can and should do is is best
option IMO.
Nico
Yv12 is a planar format. Thats another argument why i originally didn't do
this...
Its not so easy but possible to "block" the planar formats dynamically in
the driver but i am afraid this won't work in practice:
If i had to write a tv application, i would query the device capabilities
in the beginning of the session and assume these to be fixed afterwards.
A compromise might be a combination of the options: block the planar formats
by default but restore the current behaviour with an insmod option.
Anyway, thanks a lot for your comments.
Hartmut
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