Hi Everyone,
I wanted to piggyback off of this forum posting, because I am basically seeing the same problem on a new rig I started building this week. My first Instant Replay rig actually... I started using vMix in 2013 and love it to death, but never seemed to have a wish to use the Instant Replay functions until now...
Similarly to chrisis, I really only start to notice a problem when recording and playing back simultaneously in a 2-camera instant replay scenario. My best guess right now is that my storage is somehow being a bottleneck, although I have a very fast SSD dedicated to Instant Replay storage. I also managed to find a reproducable Replay UI interface bug that I will share later in this post.
My hardware is as follows:
Asus Z10PA-D8 server motherboard
2x Xeon E5-2620v4 quad core @ 2.10GHz
Intel SSD 750 Series SSDPEDMW400G4R5 400GB PCI-Express 3.0 NVM disk (for replay only)
NVIDIA GTX 750 Ti
Cameras being recorded are 2 NDI network sources inside my LAN
Project & Replay settings are 1920x1080p 59.94
vMix 21.0.0.56 x64
My total CPU usage is ~30% when running vMix with the replay recording & playing. Render times hover between 4-12ms. In the statistics window, the "Source Dropped" climbs about 5 frames per second. I have relay channel A & B set to camera 1, and if I switch channel B to camera 2, the stuttering/dropped frames gets worse. I've already run the vMix Diagnostics tool and it found no issues with running programs.
![UserPostedImage](https://i.imgur.com/KHLChYm.jpg)
I was considering buying a GTX 1080 card, but given the results by chrisis, I feel like I want to hold off for now since my render times aren't high and thus don't feel that would help this problem.
I'm definitely hoping to find a solution to the dropped frames when playing out, I feel like this disk is plenty fast.
![UserPostedImage](https://i.imgur.com/VoJe2LL.jpg)
Additionally, a separate issue mentioned above, I found some funky behavior when adding the 2 NDI cameras to the replay settings screen. If I add them and specify 25Mbps recording, the 2 replay inputs are created successfully, but when I hit record I get this error...
![UserPostedImage](https://i.imgur.com/HwCqppG.jpg)
And the instant replay controller shows no input information...
![UserPostedImage](https://i.imgur.com/GeefXf3.jpg)
If I go back to the Replay Settings and change it to 100Mbps (for example), then the input information appears and the recording begins properly. I can even change it back to 25Mbps at this point and no recording error is seen.
![UserPostedImage](https://i.imgur.com/vZv9245.jpg)
Thanks to those who have replied to my earlier threads, and thanks Martin for continuing to update and support a great product.