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tcorey  
#1 Posted : Friday, June 5, 2020 2:35:52 AM(UTC)
tcorey

Rank: Newbie

Groups: Registered
Joined: 6/5/2020(UTC)
Posts: 1
United States
Location: Texas

Hey all, I am not very skilled at video recording and mixing, so this might be a rookie question. If so, I apologize.

I am currently using vMix for recording both my camera and desktop. I am going to get to streaming once I get recording figured out. So far, the biggest issue is what appears to be dropped frames. The video is a bit choppy. When I look at the statistics, here is what I get:

vMix Statistics Page

In case you can't see it, my Cam Link 4k source has 1628 Renderer Dropped and 1038 in the Resync column.

I am not sure what this all means, and the documentation didn't help me much (not the documentation's fault - I'm not up on video rendering terms).

I am using the FFMPEG capture with the following settings:
Size: 1920x1080
Frame Rate: NTSC 29.97p
Codec: MPEG-2
Format: Transport Stream (ts)
Video Quality: 50M
Audio Quality: 384k

My camera is a Sony Alpha a5100. I am using a HDMI cable into a Cam Link 4K device, which is plugged in USB3 directly to the motherboard. The rest of my PC specs are:
Video Card: NVideo GeForce RTX 2070
RAM: 32GB
Processor: Intel i7-7700K 4.2GHz
OS: Windows 10 Pro 64bit
Hard Drive: 1TB NVMe M.2 SSD plugged directly into the motherboard

Can you help point me in the right direction of what I am doing wrong? One quick note: I am using Handbrake to convert the ts file to MP4 at the end but that does not seem to be the issue.

Thanks for looking.
ask  
#2 Posted : Friday, June 5, 2020 9:56:54 AM(UTC)
ask

Rank: Advanced Member

Groups: Registered
Joined: 10/13/2012(UTC)
Posts: 1,161
Australia
Location: Melbourne

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Was thanked: 199 time(s) in 181 post(s)
Try lowering the bitrate from 50M to 25M.... or recording directly to mp4....or use the vMix Avi codec. It sounds as if something on your PC is throttling the i/o of your hard drive.
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