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vMixCall 60fps cause drop frame & audio sample
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Hello here ! I just come here to report a issue (maybe ?), tested on two different computer Here my specs: - X99 - GTX980 - i76850k - 32GB RAM - M2 SSD - DeckLink Duo 2 To reproduce the issue you need two computers one for vMix one for the calls: Main computer : - Start a new project 720p 60fps - Add Audio Input - Add one video - Add two vMixCall - Start External - Playback & loop the video 2nd computer : - Open Chrome & load the two vMixCall Now check the statistics panel or the "I" of your external Here is an screenshot example of what I get after 20 minutes https://imgur.com/9fjX9bPHere the same project, same computer, but without vMixcall or guests is disconnected https://imgur.com/0733JazTested on Two Computer one with x99 Chipset and one with a x79 Chipset After some research I try with a 720p30 fps and guess what, no Drop with the vMixCall enable. So I pretend its a frame rate issue... If someone has the time could confirm the issue and report it to this topic I will be grateful. Best Regards
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Joined: 7/1/2015(UTC) Posts: 1,151   Location: Houston TX Thanks: 319 times
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Most WebRTC-based services simply don't support p60.
WebRTC is designed to allow browser-to-browser based video communications. That implies that most WebRTC-based applications are designed around webcams as the most common video source.
Webcams as a rule don't deliver p60. The only one that delivers 720p60 is the Logitech C922X, which is only a year old and not in widespread use.
I wonder if Martin can confirm that p60 is possible/intend via vMix Call? Specifically when one end-point is a browser.
In theory, you're making the system do a lot of work interpolating the frames. It's not surprising that some get dropped.
a vMix call between two instances of vMix is a different matter. In that case both end-points ARE p60 capable, so it should be both possible and reliable.
IMHO, for talking heads, there's very little value to p60.
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Rank: Member
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Joined: 2/24/2016(UTC)
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In the Call manager stats in & out are in 30Fps but my external / stream are in 60Fps and this is NOT a problem for me.
I just want to use 60fps for my External/Stream and not for the vMixCall, without drop samples & video frame.
So I guess it's a bug because it's work with a 30p project.
But I found a solution if you are interested :
Use multiple instances of vMix. (I recommend to duplicate the vMix folder to keep your settings between the two instances)
- vMixA : 720p60 with main video output enable with NDI
- vMixB : 720p30 with NDI enable for Calls/Camera etc..
- vMixB : Add 2 vMix Call (wait for the caller, call through NDI will be unavailable until someone is connected)
- vMixA : Load NDI input, Call1/Call2 from vMixB
- vMixB : Load NDI input, the main output from vMixA (video return for the guest)
Works pretty well, 0 drops audio & video.
I hope this will help someone who has this issue.
Keep the good work vMix Team ;)
Best Regards.
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Rank: Advanced Member
Groups: Registered
Joined: 7/1/2015(UTC) Posts: 1,151 Location: Houston TX Thanks: 319 times
Was thanked: 263 time(s) in 233 post(s)
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Interesting workaround. That suggests that there's room to optimize how the vMix call sources are handled at the receiving end.
That is, it's not a problem of being resource constrained. If the system can do it using two instances of vMix it ought to be possible in one as well.
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