Rank: Advanced Member
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Joined: 10/14/2016(UTC)
Posts: 64
Location: Sheffield
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We are having issues with smooth replay playback. It's driving me nuts. The only way we can fix it consistently is by having a trigger which stops recording during playback. Surely it should be able to record and playback at the same time? The PC specs are:
- Ryzen 3700X
- 16GB RAM
- GTX 1660 6GB
- Corsair Force MP600 500GB M.2 hard drive with 4950MB/s read and 2500MB/s write speeds.
The inputs are a mixture of SDI and NDI, all framerates and resolutions are 1080p50 on all inputs and outputs.
The only thing I'm wondering is whether having a single drive in the PC is the issue and if we need to have a separate drive for replays and system.
Any ideas?
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Rank: Advanced Member
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Joined: 10/31/2020(UTC) Posts: 158  Thanks: 3 times
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How many cameras are you recording in your instant replay settings? Are your streaming and/or recording settings using hardware encoding? What's your CPU utilization %? GPU utilization %? What speed is your RAM? Are you running it at that speed (default BIOS settings will run RAM at the slowest speed)?
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Joined: 10/6/2020(UTC) Posts: 98  Was thanked: 21 time(s) in 21 post(s)
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Originally Posted by: nomski  The only thing I'm wondering is whether having a single drive in the PC is the issue and if we need to have a separate drive for replays and system. I haven't actually used the Instant Replay feature yet, but the system requirements on the help page mentions a dedicated drive for video capture. Even if it wasn't a strict requirement, I pretty much always use a dedicated drive for recordings (even single channel) to avoid problems.
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 1 user thanked matkeane for this useful post.
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Rank: Newbie
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Joined: 12/8/2020(UTC) Posts: 9  Location: Larbert Thanks: 2 times
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We found that having different cameras using different inputs on vmix being an issue. we used to have one coming in via SDI into a blackmagic another via HDMI using an elagato and another converted from HDMI to SDI and into a balckmagic.
We've decided to just use 1 camera for replays and it sorted this issue out, this was prior to having vmix 24 and will test during the summer multiple replays again
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Rank: Newbie
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Joined: 2/19/2017(UTC)
Posts: 7
Location: greece
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I had also this problem since vmix 18. I solved this by using a cpu with 40 lanes. intel i7 6900k did the job for me. My system was using 16x lanes for gpu (980ti) 8x lanes for my video card (blackmagic quad 2 duo) 4x lanes for my nvme ssd1 and 4x lanes for my nvme ssd2.
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Joined: 3/4/2019(UTC) Posts: 9 Location: Iowa Thanks: 5 times
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I ran into this same issue and couldn't find the thing that fixed it for me anywhere in these forums, so here's a suggestion for anyone else who stumbles across this post as I did: Machine Specs:Intel Core i9-13900K CPU Gigabyte Z790 Aorus Master Motherboard 64 GB RAM RTX 4090 24GB Video Card Samsung 980 Pro 2 TB M.2 NVME Solid State Drive (x3) Windows 10 x64 Pro vMix Pro - v26.0.0.45 Problem:vMix Instant Replay playback would stutter while ingesting NDI feeds. If recording was paused, playback would perform better. I have Replay configured to use a dedicated Samsung 980 Pro 2 TB drive. I noticed within Task Manager that under disk usage for this particular drive, the average response time would also rise above 200 ms when the stuttering occurred. Fix:Because I have a dedicated drive for replays, I was able to perform a diskpart/ clean procedure. Subsequent testing has shown that this has fixed my particular issue. X-posted on other similar vMix forum posts for visibility via Google searches. I hope this helps someone else in the future!
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Rank: Newbie
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Joined: 3/4/2019(UTC) Posts: 9 Location: Iowa Thanks: 5 times
Was thanked: 3 time(s) in 2 post(s)
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