Hi everyone,

I'm facing an issue in vMix last days. Once streaming starts, a Virtual Input appears and begins to accumulate dropped frames. Shortly after, my main camera inputs also show Source Dropped, Renderer and Resync Dropped. If stream is not started - no drops.

This used to work perfectly — with 2 cameras running at 1080p25, or 1 camera at 1080p50. The issue appeared recently, without any major system changes (well, I changed project to 50p for an event, then back to 25p - like many times before, not sure could be the reason but this is the last I've done).

I'm using an Acer Nitro 5 AN515-57 (i7-11800H, 16 GB RAM, RTX 3050 Ti, 2 SSD), and the capture device is Rullz. Ironically, the exact same setup (same cameras, same vMix preset) runs without issues on a weaker laptops, even 2 Rullz. I repeat: I use the same configuratuon on 3 laptops for 2-3 years, and it worked well.

Yes, I use GPU. Yes, I use hardware encoder option. CPU, GPU etc are under 25-35%. Temperature - 55.

I've tried reinstalling USB and chipset drivers, disabling USB suspend, adjusting power settings, new blank project, even testing LAV filters and alternative stream encoders — nothing seems to help. OBS works fine on the same machine — no dropped frames at all (0.00% frames lost.

Any idea what could be causing this shift in behavior or how to make vMix handle MJPG inputs more reliably again?

Thanks in advance!

Screeshot with statistics and drops accamulated for 10 mins

P.S. 40 40 40 40 is not always. Usually it is smth like 40 38 40 41 if it is important.

Well. Found smth very WEIRD.

Reinstalled Vmix - didn't help.

Now weird things.

1. When I press Record button - no drops!!!!! When I stop recording - drops slowly accumulated. Multiply tests. WTF?????
2. When I take off "Use hardware encoder" in Stream cug - no drops. CPU is around 80% (with 2 cameras connected), sometimes CPU overloaded alert, but no drops. With both Record button ON or OFF. I have RTX 3050 Ti - 35% usage when I stream with it.

Any ideas?