Devices > Video Cards, Monitors, Televisions, and Projectors

Madvr stutters on 720P with DSP convolution

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Franky:
I must correct my post: The AUDIO is stuttering, NOT the video.
A as you can see in the jpg the MADVR is fine, but the audio is stuttering. My DAC gets interruptus in data stream.
With large lip sync and 1080p and higher all is fine.

mattkhan:
what does cpu load look like during this?

eve:
I'm pretty sure this trips up most people with MadVR.
If you're trying to upscale content that's LOWER resolution, it's actually *more* of a load on the system.

Say we're targeting a 4K display, and we have 4K retail video sources, well if you aren't using doubling or quadrupling, MadVR is mostly being loaded with the Chroma scaling step.
Whereas, if we're bringing up say 576p (aka SD video like you're using here, not 720p which is more in the ballpark of 1280x720) to a 4K display, MadVR is now handling some pretty intensive Luma scaling in addition to the Chroma.

Convolution filters by their nature, also have quite a significant processing demand.

A piece of advice here that might address your issues, create another MadVR scaling profile. Be a little more conservative with your settings and any doubling / quadrupling, you can apply this profile to sub 1080p content or just switch to it on the fly. See if that helps at all, yes the scaling quality might not be as good but at least it's a starting point.

Hardware specs just out of curiosity? Been toying with the idea of Convolution filters for a test bed system that doesn't handle video but I know if I like what happens I'll want it in my actual system which does demand video.

mattkhan:
madvr will stress the GPU
convolution will put load on the CPU though any decent spec PC can handle significant convolution load without that much difficulty

one possibility is that something about the 720p processing is being done on the CPU (but is done by the GPU for higher res) and the combination is too much

anyway I'd look at cpu load next to see what it reports

eve:

--- Quote from: mattkhan on November 16, 2022, 01:13:06 pm ---madvr will stress the GPU
convolution will put load on the CPU though any decent spec PC can handle significant convolution load without that much difficulty

one possibility is that something about the 720p processing is being done on the CPU (but is done by the GPU for higher res) and the combination is too much

anyway I'd look at cpu load next to see what it reports

--- End quote ---

There's absolutely stuff done on CPU in MadVR, it's limited but it's there. If you're loading the CPU with time sensitive convolution filters and simultaneously, madVR needs it (even if it's 'small') , you can have a latency issue.

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