Re: mga_vid and interlaced output via DVI (NOT tv-out)

> On Tuesday, September 11, 2007 1:44 AM
> "Attila Kinali" <[email protected]> wrote:
>
> Morgen!
>
>> On Sun, 9 Sep 2007 23:32:47 +0200
>> "Michael Langguth" <[email protected]> wrote:
>>
>> so i tried to use 576i. after i realized that the horizontal
>> resolution has to be doubled from 720 to 1440...
>
> I don't really understand what you are doing. Please
> provide at least your xorg.conf, eventually used
> mga_vid parameters and the parameters you pass to MPlayer.
> See bugreports.html for a complete list of information needed.
>

hallo attila,

i try to play a video in standard pal resolution via dvi connected to hdmi. =

as stated in my original posting, progressive modes work well in top qualit=
y. =

only interlaced modes are missing for a perfect "tv-out 2.0".

the doubled horizontal resolution is part of the hdmi spcification (see =

http://www.hdmi.org/pdf/HDMISpecInformationalVersion.pdf, capt. 6.4):

  "Video formats with native pixel rates below 25 Mpixels/sec
  require pixel-repetition in order to be carried across a TMDS
  link. 720x480i and 720x576i video format timings shall always
  be pixel-repeated."

this is the normal procedure used in any consumer device outputting 576i vi=
a =

hdmi: the device doubles each pixel and sends the signal in 1440x576i to th=
e =

display. the display ignores every second pixel to get back the original =

720x576i. if you look in the manual of flat tv's you often will read about =

pal over hdmi as "720(1440)x576i@50hz". higher resolutions like 1080i have =

high enough pixel rates and do not need this special treatment.


but thats not my problem. my problem is the doubling of vertical lines. i c=
an =

reproduce this in 576i and 1080i (which has no hor. doubling), independant =
of =

mplayer just by using mga_vid_test. i do not use an x-server, i have a simp=
le =

text based "gui" running in a framebuffer console.

here my fb.modes entry for the interlaced modes:

  mode "576i-50"
      # hdmi cannot handle 13.5 mhz, so every pixel has to be doubled.
      # D: 27.000 MHz, H: 31.250 kHz, V: 50.000 Hz
      geometry 1440 576 1440 576 32
      timings 37037 120 40 42 4 128 3
      laced true
  endmode

  mode "1080i-50"
      # D: 61.874 MHz, H: 28.124 kHz, V: 49.999 Hz
      geometry 1920 1080 1920 1080 32
      timings 16162 148 88 31 4 44 10
      laced true
  endmode

mplayer.conf is realative simple:

  vo=3Dmga
  ao=3Dalsa
  fs=3Dyes
  framedrop=3Dyes
  cache=3D8192
  monitoraspect=3D16:9
  aspect=3D16:9
  vop=3Dhue
  contrast=3D-15
  brightness=3D10
  saturation=3D-15
  hue=3D0
  rtc=3D1
  mc=3D0.002
  autosync=3D100
  lirc=3Dyes
  lircconf=3D/usr/local/etc/lirc/mplayer.rc
  joystick=3Dno


insmod mga_vid is done without any parameters.


i am not sure if i was able to describe what i see on the screen: if i have=
 a =

1080i video, only the upper half of it will be displayed, zoomed to =

fullscreen. egghead alert!

when i start mga_vid_test from the console, i see a rectangle instead of a =

square. you remember, if you run mga_vid_test, the square is displayed over =

the console. in my case this is also the case and the console remains visib=
le =

completely in correct aspect. only the test pattern is not square but a =

rectangle with width:height =3D 1:2.

if it helps i can provide a photo.


by the way: is there any kind of description of the bes registers available=
? =

may be i could try out something by my self...


viele gr=FC=DFe,

michael