[mythtv-users] What format to output - 480i/720p/1080i

[jedi at mishnet.org]

> On 5/22/07, Matt <skd5aner at gmail.com> wrote:
>> On 5/21/07, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
>> > On 5/21/07, Matt <skd5aner at gmail.com> wrote:
>> > > Hi!
>> > >
>> > >    I recently got me a nice HD plasma.  In addition, I'm not
>> recording
>> > > some HD content over QAM, both 720p and 1080i.  The plasma's native
>> > > resolution is: 1360x768/60Hz.
>> > >
>> > > 90% of my content is SD - 480i
>> > > 10% is a mix of 720p and 1080i.
>> > >
>> > > My cable box will output whatever the original source content is.
>> > > That allows the TV to scale and deinterlace, which it was built to
>> do.
>> > >  However, I believe I can only output one resolution from my video
>> > > card.  Is there anyway for mythtv and/or xorg to output the native
>> > > resolution of the recording and let the television handle the
>> scaling
>> > > and deinterlacing?
>> > >
>> > > I'm using a component adapter from my video card into the my TV.  I
>> > > can also use HDMI/DVI or VGA, but I prefer not to use VGA because
>> the
>> > > TV doesn't have as many picture controls for that input.  The reason
>> > > I'm not using DVI, is because you can't get the true native
>> resolution
>> > > over it, here's what you can get over the HDMI ports:
>> > >
>> > > 1920x1080i at 59.94/60 Hz
>> > > 720x480p at 59.94/60 Hz
>> > > 1280x720p at 59.94/60 Hz
>> > > 720(1440)x480i at 59.94/60 Hz
>> > > 1920x1080p at 24 Hz
>> > >
>> > > So, how should I output the video?  Obviously it's a progressive
>> > > display, but I've noticed that some of my interlaced material could
>> > > look better than the deinterlacing myth is providing.  Any thoughts?
>> >
>> > with XRandR Myth can output any number of resolutions and change them
>> > based on the content played back. I'd suggest setting up a 720p and
>> > 1080i modeline that work with your TV as well as one at it's native
>> > resolution. Have the menu system setup to use the native res and have
>> > it output TV at the recorded resolution. I'd recommend native for 480i
>> > content.
>> >
>>
>> Thanks Steve.  Is this documented anywhere?  I must admit that I
>> haven't looked hard, but I didn't find anything on the wiki.  I did
>> find various references, but nothing that really lays out the details.
>>  I appreciate the help - this sounds pretty much exactly what I'm
>> looking to do!  Do a lot of people use xrandr?  I'm assuming they're
>> using a dedicated resolution.
>
> i think just in searching this list you'll find i've given that advice
> a few times.
>
> xrandr is a standard part of the newer Xorg versions. Many MythTV
> users use it for both HDTV and SD.

Why would something "new" be required for this? Applications have
been able to switch the current physical resolution of X for years.
You just need to have appropriate modelines in your config file.