[mythtv-users] Playback looks at screensize not at monitor or windowsize

[Hika van den Hoven]

Hoi Karl,

Monday, June 15, 2015, 7:30:33 AM, you wrote:

> On Sun, Jun 14, 2015 at 3:12 PM, Michael T. Dean <mtdean at thirdcontact.com>
> wrote:

>> On 06/14/2015 01:59 AM, Karl Newman wrote:
>>
>>> On Sat, Jun 13, 2015 at 9:33 PM, Hika van den Hoven <hikavdh at gmail.com
>>> <mailto:hikavdh at gmail.com>> wrote:
>>>
>>>     Hoi Karl,
>>>
>>>     Sunday, June 14, 2015, 5:59:13 AM, you wrote:
>>>
>>>     > On Fri, Jun 12, 2015 at 12:12 PM, Michael T. Dean
>>>     <mtdean at thirdcontact.com <mailto:mtdean at thirdcontact.com>>
>>>     > wrote:
>>>
>>>     >> On 06/12/2015 09:42 AM, Karl Newman wrote:
>>>     >>
>>>     >>> On Thu, Jun 11, 2015 at 11:58 PM, Michael T. Dean wrote:
>>>     >>>
>>>     >>>  and should not (ever--for anyone, even without Xinerama) set
>>>     the Playback
>>>     >>>> setting:
>>>     >>>>
>>>     >>>> Video aspect override
>>>     >>>> When enabled, these will override the aspect ratio specified
>>>     by any
>>>     >>>> broadcaster for all video streams.
>>>     >>>>
>>>     >>>> where, if (for anyone at all) it seems like "Video aspect
>>>     override" needs
>>>     >>>> to be set to get a proper display, you have misconfigured
>>>     something else
>>>     >>>> (like, for example, your X configuration for DPI/DisplaySize).
>>>     >>>>
>>>     >>>>  I dunno, I use this setting and it seemed to be the only way
>>>     I could get
>>>     >>> recordings to display correctly. My recordings are all 4:3 (from a
>>>     >>> PVR-500)
>>>     >>> and my TV is also 4:3, but I have to drive it with an HMDI to
>>>     Composite
>>>     >>> converter which looks like a 16:9 target to the computer. So
>>>     setting the
>>>     >>> aspect override to 16:9 is the only way video displays
>>>     correctly on the TV
>>>     >>> (otherwise it would squeeze and letterbox horizontally).
>>>     >>>
>>>     >>>
>>>     >> That just means you have X misconfigured.  If you're displaying
>>>     the image
>>>     >> on a physical display with a 4:3 aspect, you need to tell X to
>>>     use a 4:3
>>>     >> aspect.  I realize you're saying that the "autodetection" picks
>>>     up 16:9,
>>>     >> but you need to override that with an explicit setting because
>>>     it's wrong.
>>>     >>
>>>
>>>     > Any hints about how I'd do that? I searched around for setting
>>>     the aspect
>>>     > ratio on X but didn't turn up anything obvious. Maybe it just
>>>     assumes
>>>     > square pixels? If that's the case then I really do need that
>>>     setting in
>>>     > myth. Eventually it will be a moot point when I get around to
>>>     buying a new
>>>     > TV, but this is what I'm stuck with for now.
>>>
>>>     > Karl
>>>
>>>     I don't know if it will have effect, but you say your pixels are not
>>>     square. You can specify this in the Screen section with option "DPI".
>>>     I have: Option "DPI" "100x100". If you have displaysize specified in
>>>     your Monitor section, eg. DisplaySize 400 300, it should calculate the
>>>     DPI from that.
>>>
>>> Yes, I do have DisplaySize set in a 4:3 ratio, but I think the HDMI to
>>> composite adapter mangles the picture unless it comes in a 16:9 ratio. I
>>> guess I could put in a fake DisplaySize but that seems wrong.
>>>
>>
>> More wrong than putting in a fake aspect ratio for MythTV?  Either way
>> you're lying--one way to just MythTV (meaning other programs will display
>> wrong) and the other way to X.
>>
>>  Maybe the same amount of wrong as setting it in Myth?
>>>
>>
>> Exactly.
>>
>> Note, too, that DPI, DisplaySize, and many others are often ignored
>> (and/or invalid--DPI is nvidia-specific) depending on what drivers you're
>> using.  You may have to include things like IgnoreEDIDDPI or such to get
>> the X drivers to listen to what you're saying.
>>
>> What does:
>>
>> xdpyinfo
>>
>> give?
>>
>> http://pastebin.com/fqKk3ZJ0

> Weirdly enough, after this discussion I increased the DisplaySize by 1 mm
> in each direction to make it a true 4:3 (560x420) and restarted the X
> server, but it doesn't seem to be picking it up. It's still showing
> 559x419. Not sure why.

> Karl

My first thought was that your edid supplies it, but that's
impossible. You say you use a hdmi to composite converter, so no
datalines coming from the monitor/tv. Does the converter have some
programmable edid? What do you see in Xorg.0.log about the detection?
And how do you acquire the modelines? With my vga to scart interlaced
connection it took me a lot of trial and error, starting with default
PAL modelines, to get that optimized. My TV is even more complex. It's
a partially auto switching physical 16:9 display. But PAL is by
default 4:3. So all kinds of overscan and I had to fixate the
autoswitching with a signal on one of the scart pins.

Tot mails,
  Hika                            mailto:hikavdh at gmail.com

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Zonder leven is er geen hoop
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