logo

Live Production Software Forums

www.vmix.com

Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error
Consistent Broadcast Frame Rate - vMix Frame Rate Inconsistencies
Options
Go to last post Go to first unread
Previous Topic Next Topic
rjmurdock  
#1 Posted : Wednesday, December 1, 2021 10:13:31 PM(UTC)
rjmurdock

Rank: Advanced Member

Groups: Registered
Joined: 11/12/2012(UTC)
Posts: 51
Man
Location: Fort Walton Beach, FL USA

Thanks: 6 times
Was thanked: 2 time(s) in 2 post(s)
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).
Back to top
WWW

Wanna join the discussion?! Login to your vMix Forums forum account, or Register a new forum account.
Back to top  
admin  
#2 Posted : Sunday, December 5, 2021 7:43:08 PM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,211
Man
Location: Gold Coast, Australia

Was thanked: 4301 time(s) in 1523 post(s)
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.
Back to top
WWW BLOG
mjgraves  
#3 Posted : Tuesday, December 7, 2021 1:48:31 PM(UTC)
mjgraves

Rank: Advanced Member

Groups: Registered
Joined: 7/1/2015(UTC)
Posts: 1,151
Man
United States
Location: Houston TX

Thanks: 319 times
Was thanked: 263 time(s) in 233 post(s)
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/
Back to top
WWW BLOG
Users browsing this topic
Guest (2)
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Privacy Policy | Powered by YAF.NET | YAF.NET © 2003-2024, Yet Another Forum.NET
This page was generated in 0.101 seconds.