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

Karl Newman newmank1 at asme.org
Mon Jun 15 05:30:33 UTC 2015


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
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