30p should be just as smooth in vMix and 50p more so.
If you are seeing stuttering there could be a number of causes, such as using cameras with different frame rates, not setting
the frame rates in vMix to all match, or the graphics card might not be keeping up (seen by a render time higher than 20ms in vMix)

@ FAndreas

What exactly is your definition of "smooth"?

Undoubtedly, professional broadcast cameras, lenses, and lighting are going to provide a much "richer" and more "refined" picture quality.
Hardware switchers are notoriously "smooth" and "precise" for transitioning between images.
Standalone hardware streaming encoders are designed to do one thing, and do it very well.
So pardon the pun, but it's hard to compare apples to oranges here without knowing what you mean by 'Smooth'...

The implication is that by comparison, your 'broadcasts' with vMix are "choppy" (i.e. looks like 15 fps as opposed to 30 fps).
As vMix Admin has alluded to this has more to do with the encoding and processing within your system and it's ability to multi-task as well the connection to your CDN.

I don't know because I can't see what you are seeing, but I suspect the differences you are noticing have more to do with the equipment being used (professional broadcast vs consumer/prosumer) than anything else.
There is a reason why high end productions cost so much, a tripod can cost as much as your entire vMix set-up, so side-by-side comparisons can be unfair unless you do a cost analysis comparison as well.

Just my thoughts.


Ice

Actually 30k usd camera will look the same as 1k usd camera in terms of motion. The price has nothing to do with it, assuming camera outputs according to SMPTE standards. And vMix will process the both cameras the same way.

I suggest you play around with the frame rate, interlacing options and shutter speed to achieve the best result for your specific situation. For example, if you want to improve the quality of motion at 30fps, you can always try outputting 60i, use deinterlace blend. Or you could experiment with setting the fps in camera to 30fps, shutter to 1/60 or go wild and set the shutter to 1/30, and see what happens then.

To match the smooth 30p, the cameras should be set to 30p or 29.97p in camera as well.
I think the problem with streaming 50p is most browsers dont play that back very well at the moment.

Stick with either 25p or 30p when streaming and match those frame rates in camera and it should be fine.

We typically produce in 50p (main setting), and stream at 25p (external set to that). Effective both for CPU and bandwith.
Still not all CDN's support 50p all the way.
Even at low bit rates (1.5 mbps) a 25p stream is pretty smooth. For some productions (like sport) 50p is of course smoother.
As said earlier, if you have problems with stuttering that is more likely an underpowered PC or problems with camera settings, which you would se in Preview/Output anyway.

Maybe you could upload a video recording so we can take a look?

Maybe the stuttering you are referring to is just a side effect of the 25p frame rate in which case compare
it with other 25p videos elsewhere and am sure it will look the same.

30p can be smoother to a lot of viewers, but you are not going to be able to convert 50p to 30p
smoothly as they do not divide evenly.

So, today I have recorded a test video in 25p on my nginx rtmp server while I was streaming.
In StrobeMediaPlayback I saw the choppy playback. But after downloading the video from server and played back in VLC I didn't had such a choppy playback. It looked much better.
So I started a Test with JWPlayer and had the same choppy playback. Ok, makes sense because both player utilizing flash.
Same behaivour on another PC and Mac.
It's definitly flash related. Anyone knows if there a troubleshooting tools for flash?
Nobody has the same behavior?

Regards,
Andreas