[solved] Dropping frames when watching live TV (1 Viewer)

[Stéphane Lenclud]

It looks like I'm dropping frames while watching live TV not matter the video codec.
I tried LAV, Microsoft and CyberLink codecs.
Same effect when playing TS files.
Playing MKV works just fine.
Logs attached.

 

[mm1352000]

I can see the dropped frames in the EVR log, but there's no obvious cause.

Does the same happen for recordings?
What happens if you [temporarily] disable your DD Live encoding?
Please attach a screenshot of the MP render stats (shift + 1) and task manager CPU usage.

 

[Stéphane Lenclud]

Does the same happen for recordings?

Indeed.

What happens if you [temporarily] disable your DD Live encoding?

Not helping. Sound it totally ok too.

Please attach a screenshot of the MP render stats (shift + 1) and task manager CPU usage.

It's the exclamation mark '!' which is some place else on AZERTY keyboards

 

[mm1352000]

The screenshot makes it clear. TV content is 50 fps where you are. Your display is running at 23.97 fps, so [50 - 23.97 = 26.03] fps will have to be dropped. To solve, I guess you just need to enable automatic refresh rate changing so that the display runs at 50 fps.

[edit:
proper content frame rate = 50 fps
actual frame rate = 23.97 fps
difference between actual and proper frame rates = 26.03 fps
expected frame drop percentage = [difference between actual and proper frame rates] / [proper content frame rate] = 26.03 / 50 = 52.06%
actual frames dropped = 1402 frames
actual frames drawn = 1319 frames
total frames = [actual frames dropped] + [actual frames drawn] = 2721 frames
actual frame drop percentage = [actual frames dropped] / [total frames] = 1402 / 2721 = ~51.5%

51.5 is pretty close to the expected/predicted 52.06. ]

 

[Stéphane Lenclud]

Awesome that fixed it. Not sure when my display was set to 23Hz. Then again I've been quite busy playing with those drivers settings lately.

 

[mm1352000]

To be clear: I wasn't suggesting to modify anything in the nVidia GPU settings. I was talking about this here:
http://wiki.team-mediaportal.com/1_...figuration/11_General/21_Dynamic_Refresh_Rate

 

[Stéphane Lenclud]

Never used that Dynamic Refresh Rate feature before. I suppose as long as the driver frequency is higher than the video I'm ok.
Mine was set to 23Hz in the driver for some reason.

 

[mm1352000]

I suppose as long as the driver frequency is higher than the video I'm ok.

Incorrect. To get smooth video, the display/monitor frame rate should exactly match (or be a multiple of) the content frame rate.

If the display/monitor frame rate is lower than the content frame rate then frames are dropped as you saw.
If the display/monitor frame rate is higher than (and/or not a multiple of) the content frame rate then frames are repeated. People describe the effects in various ways including micro stutters, jerky panning etc.

 

[Stéphane Lenclud]

Ok then I should try it out I guess. Does it put is back to 60Hz when exiting MP?

 

[mm1352000]

I assume so. I can't use it because my monitor only supports 60 Hz.

[edit: Actually, if I recall correctly, the frame rate goes back to 60 Hz when the video is stopped and the MP GUI becomes visible again.]