[mythtv-users] How to get mythfrontend to report the xorg framerate info?

William Munson william_munson at bellsouth.net
Sun Sep 16 15:26:02 UTC 2007

Tom Dexter wrote:
> On 9/16/07, William Munson <william_munson at bellsouth.net> wrote:
>> Of course. What I want to know is what myth thinks my settings are. I
>> know it calculates the frame rate and then uses that info to determine
>> how to display the tv picture. My video source is 29.97 but I doubt my
>> monitor is correctly set to that value as I had to create the modeline
>> on my own and even by my math its off a bit. It would be real helpful to
>> be able to make a change to the dot clock frequency and see that change
>> in the frame rate myth calculates. This will let me precisely set the
>> video out to be exactly on for NTSC video display.
> If you start the frontend with "-v playback" the logs will show that
> stuff.  It shows frame interval and refresh rate.  It shows it in the
> form of microseconds per interval...for example 33366, where you can
> calculate the rate with 33366/1000000.
> Tom
Maybe I misunderstood but I thought that number was for the source 
material and not for the display. Maybe this will help. Here is my 
modeline which drives a Philips HD tv/monitor (A very picky device, only 
accepting valid ntsc modes.)

    ModeLine     "my540p" 37.3 824 944 1048 1104 468 514 528 563 +hsync 
    ModeLine     "my1080i" 74.5 1640 1888 2096 2208 920 1012 1028 1126 
-hsync -vsync interlace

These modelines have been manipulated to correctly size and position the 
visible portion of the screen to fit my tv perfectly. Because of this, 
most modeline programs simply barf or report timings that are completely 
wrong. What I want to know is how far off from the idea 29.97 refresh 
rate are these modes so that I can manupulate the clock rate and sync 
pulses to hit the standard exactly.

Thoughts? Ideas?

More information about the mythtv-users mailing list