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Kaf  
#1 Posted : Wednesday, September 13, 2017 1:40:02 PM(UTC)
Kaf

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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/9fjX9bP

Here the same project, same computer, but without vMixcall or guests is disconnected
https://imgur.com/0733Jaz

Tested 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
mjgraves  
#2 Posted : Wednesday, September 13, 2017 3:54:17 PM(UTC)
mjgraves

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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.
Kaf  
#3 Posted : Thursday, September 14, 2017 10:50:59 AM(UTC)
Kaf

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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.
mjgraves  
#4 Posted : Thursday, September 14, 2017 11:42:44 AM(UTC)
mjgraves

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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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