[mythtv-users] new nvidia 352.30 drivers : frame-rate issues

[mo.ucina]

IMO you don't need any interlaced video modes, your video card can
output (& out perform the TVs) de-interlaced video.

Those modelines look suspicious in that the pixel clock frequency is
constant across different vertical frequencies. Look to have been
calculated to minimize the pixel clock rate changes.

Digital flat panel using DVI/HDMI/DP should work better with reduced
vertical blanking timings. Some TVs only work with these modes.

# 1920x1080 59.93 Hz (CVT 2.07M9-R) hsync: 66.59 kHz; pclk: 138.50 MHz
Modeline "1920x1080R"  138.50  1920 1968 2000 2080  1080 1083 1088 1111
+hsync -vsync

# 1920x1080 49.93 Hz (CVT 2.07M9) hsync: 55.62 kHz; pclk: 141.50 MHz
Modeline "1920x1080_50.00"  141.50  1920 2032 2232 2544  1080 1083 1088
1114 -hsync +vsync

# 1920x1080 23.91 Hz (CVT) hsync: 26.25 kHz; pclk: 63.00 MHz
Modeline "1920x1080_24.00"   63.00  1920 1976 2160 2400  1080 1083 1088
1098 -hsync +vsync

# 1920x1080 47.89 Hz (CVT) hsync: 53.30 kHz; pclk: 134.75 MHz
Modeline "1920x1080_48.00"  134.75  1920 2024 2224 2528  1080 1083 1088
1113 -hsync +vsync


_______________________________________________
mythtv-users mailing list
mythtv-users at mythtv.org
http://lists.mythtv.org/mailman/listinfo/mythtv-users
http://wiki.mythtv.org/Mailing_List_etiquette
MythTV Forums:https://forum.mythtv.org

Thanks for the info . That is very interesting . My issue has been 
resolved by falling back to 352.21 nvidia drivers . All the frame-rates 
now are working well with mythfrontend . And as I change from one file 
to another and from one program to another the correct frame rate is 
chosen in every case  . Also I can confirm no visible judder any more .

But this modeline stuff opens another interesting topic of conversation 
. I am using JY Avenard's modeline settings , as he has the exact same 
tv as me . But out there I have seen a couple different sets of 
modelines for the same model . As well as the one suggested here . What 
effect would be observed if I were to change the modeline timing from my 
current one which is :

     ModeLine       "1920x1080 at 60" 148.500 1920 2008 2052 2200 1080 1084 
1089 1125 +hsync +vsync
     ModeLine       "1920x1080 at 50" 148.500 1920 2448 2492 2640 1080 1084 
1089 1125 +hsync +vsync
     ModeLine       "1920x1080 at 24" 74.250 1920 2558 2602 2750 1080 1084 
1089 1125 +hsync +vsync
     ModeLine       "1920x1080 at 23.976" 74.175 1920 2558 2602 2750 1080 
1084 1089 1125 +hsync +vsync

to the one above .

Best Regards
Milorad