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rjmurdock  
#1 Posted : Wednesday, December 1, 2021 10:13:31 PM(UTC)
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I'm starting to notice issues when I want to re-edit my live vMix recording with my camera footage where the camera is recording at a locked broadcast frame rate of 59.94 BUT my vMix recordings are not recording at a consistent 59.94 frame rate. It's interesting yet disturbing to watch the vMix status bar at the bottom left display a frame rate which bounces around the selected output frame rate. For example, for a long form recording of an event, one of my 20-min parsed video recorded segments show a frame rate of 59.73 while the next 20-min file shows a frame rate of 59.90 My production PC is an Intel I9 with a GTX 2070 card and 48GB RAM, so it has the power to handle a few 1080p59.94 camera inputs without dropping frames.

So is there any way to ensure vMix stays locked at recording 1080p59.94 without varying the frame rate?

vMix Frame Rate Inconsistencies.png (184kb) downloaded 1 time(s).
admin  
#2 Posted : Sunday, December 5, 2021 7:43:08 PM(UTC)
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vMix does lock to the frame rate.
However, if the system is not fast enough and you are dropping frames in the recording
the properties of the video file will show a different frame rate.

This is because some apps calculate it by dividing the number of frames by time, ignoring any skipped or duplicate frames.

So you will need to check your production and reduce inputs/settings etc to fit into the performance of the system so there are no dropped frames.
mjgraves  
#3 Posted : Tuesday, December 7, 2021 1:48:31 PM(UTC)
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Also, 1080p59.94 is not exactly valid "broadcast" frame rate in the US.

ATSC 2 allows only 1080i59.94. ATSC 3 is just on the cusp of deployment.

https://www.atsc.org/nextgen-tv/deployments/
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