1 Topic by j86cmentrancemaster (edited by j86cmentrancemaster 27-11-2018 00:34:53)

Topic: When using LAV, can't set fps in SVP4 > 60, or it will be stuttering

I'm using LAV+madvr+svp4 for testing now.
I found that if I set svp4 fps =60 or same as monitor, the video is smooth.
But if I set svp4 fps=120, it is stuttering, but cpu/gpu is not that heavy, I felt like half of frame is cutted. something like huh,,,,,,smooth stuttering?
And I tested to close madvr, nothing changed.
then I tested stop using LAV, everything is ok.
As using LAV can let the video framerate show as 60fps, I think may be there is some problem or conflicts?
But I can't find any option to solve this.

  • MAG79
  • SVP developer
  • Offline

Re: When using LAV, can't set fps in SVP4 > 60, or it will be stuttering

Your monitor refresh rate is 60 Hz. SVP gives 60 fps.
1. Why you need more than 60 fps?
2. How do you think they be shown at 60 Hz display?
3. madVR very hardly uses GPU to process every frame. So when you want more than 60 fps you give additional work to your GPU.

3 Reply by j86cmentrancemaster (edited by j86cmentrancemaster 27-11-2018 04:40:32)

Re: When using LAV, can't set fps in SVP4 > 60, or it will be stuttering

MAG79 wrote:

Your monitor refresh rate is 60 Hz. SVP gives 60 fps.
1. Why you need more than 60 fps?
2. How do you think they be shown at 60 Hz display?
3. madVR very hardly uses GPU to process every frame. So when you want more than 60 fps you give additional work to your GPU.

1.by some config guide, even with a 60fps monitor, setting to 120fps can be more stable and more smooth. Not sure if this is right, maybe it's wrong because high cpu/gpu usage can cause problem I think, but actually I just want to find out why I can set to 120fps and no problem without LAV, but can't be ok with LAV, just for curiosity.
2.Actually it is not 60fps, I mean when press tab, the output information show something like 23.97->6x.xx, and I don't know whether this caused the problem.
3.As I said, I met this problem even when I disable madvr, only with LAV. And I can see the cpu/gpu usage is pretty low. The video is not stuttering like gpu usage problem, it is like "smooth 1s->lag 1s->smooth 1s(but some frame seems lost)".
As my feeling, it is like:
turns the video into 120fps,for example frame is :
1-2-3-4-5-6-7-8-9-10-11-12
and turn back to 60fps for output, the correct frame maybe:
1-3-5-7-9-11
but the result is
1-2-3----7-8-9---

Re: When using LAV, can't set fps in SVP4 > 60, or it will be stuttering

> even with a 60fps monitor, setting to 120fps can be more stable and more smooth

wrong

Re: When using LAV, can't set fps in SVP4 > 60, or it will be stuttering

Chainik wrote:

> even with a 60fps monitor, setting to 120fps can be more stable and more smooth

wrong

alright:)
maybe just use the monitor fps is best

6 Reply by j86cmentrancemaster (edited by j86cmentrancemaster 27-11-2018 08:32:03)

Re: When using LAV, can't set fps in SVP4 > 60, or it will be stuttering

and, for addtional information,
I found it was a wrong that lav caused the problem.
after test in a clean install, i found it is caused by madvr or madashi(in potplayer).
maybe they can only render 60fps i think?
I can see plenty of drop frame when i set svp4 higher than 60fps(120fps, or 75fps, increased every seconds), but it is pretty strange once I installed madvr even if i disable it keeps cause the problem...........
If i set svp4 to 60fps there is no drop frame.