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Interesting Issue with Stream "Throttling" - What would cause one stream of many to error
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Phil Brylow  
#1 Posted : Saturday, May 3, 2025 2:04:35 AM(UTC)
Phil Brylow

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Multiple streams to YouTube and/or Facebook during a multi-court sporting event. Plenty of bandwidth (100 Mbps + for upload).

Every court goes to it's own stream on YT/FB/other host site - zero issues. All on laptops with i7's and Intel 40xx series graphics cards with vMix Basic

"Main Feed" pulls in court feeds for commentary - that feed's streaming to YT/FB is throttled, even at 720p/1.5 Mbps, even though 6 court feeds are all streaming fine at 1080p/3 Mbps at the same time.

Main feed is an i9, with 4060 series Intel GC, vMix Max (Pro subscription). CPU Mem is less than 20% while this is occurring.

If I stream to another host site outside YT/FB on the "main feed"; I can stream 1080p/6 Mbps with zero issues.

Has happened at two of my last three events after 3 years of zero issues; ended up using another "court" laptop with vMix Basic to push the Main Feed stream out to YT/FB with zero issues.

Possible something changed on the Main Feed laptop during a Windows Update, but what?

Thanks for any assistance.
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mavik  
#2 Posted : Monday, May 5, 2025 10:20:54 PM(UTC)
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The fastest approach would be to reinstall windows and vmix. Otherwise is like finding a needle in the hay stack
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Phil Brylow on 5/8/2025(UTC)
ckvideo  
#3 Posted : Tuesday, May 6, 2025 2:44:36 AM(UTC)
ckvideo

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Originally Posted by: Phil Brylow Go to Quoted Post
Multiple streams to YouTube and/or Facebook during a multi-court sporting event. Plenty of bandwidth (100 Mbps + for upload).

Every court goes to it's own stream on YT/FB/other host site - zero issues. All on laptops with i7's and Intel 40xx series graphics cards with vMix Basic

"Main Feed" pulls in court feeds for commentary - that feed's streaming to YT/FB is throttled, even at 720p/1.5 Mbps, even though 6 court feeds are all streaming fine at 1080p/3 Mbps at the same time.

Main feed is an i9, with 4060 series Intel GC, vMix Max (Pro subscription). CPU Mem is less than 20% while this is occurring.

If I stream to another host site outside YT/FB on the "main feed"; I can stream 1080p/6 Mbps with zero issues.

Has happened at two of my last three events after 3 years of zero issues; ended up using another "court" laptop with vMix Basic to push the Main Feed stream out to YT/FB with zero issues.

Possible something changed on the Main Feed laptop during a Windows Update, but what?

Thanks for any assistance.


Phew, difficult one...

First I would try to find out if realy this laptop is the culprit or if some complicated network issue hit you during the show and by accident affected the Main laptop.

What do you mean by ""Main Feed" pulls in court feeds for commentary" - does this laptop read the streams from all other laptops? If yes, what kind of stream are we talking here: RTMP, SRT, NDI, which bitrate, which codecs?

Please give some more details on the network setup and the network load involved.

What kind of connection did you use for upstream to the internet?

Best,

Christian
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thanks 1 user thanked ckvideo for this useful post.
Phil Brylow on 5/8/2025(UTC)
Phil Brylow  
#4 Posted : Thursday, May 8, 2025 12:31:35 AM(UTC)
Phil Brylow

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Originally Posted by: ckvideo Go to Quoted Post
Originally Posted by: Phil Brylow Go to Quoted Post
Multiple streams to YouTube and/or Facebook during a multi-court sporting event. Plenty of bandwidth (100 Mbps + for upload).

Every court goes to it's own stream on YT/FB/other host site - zero issues. All on laptops with i7's and Intel 40xx series graphics cards with vMix Basic

"Main Feed" pulls in court feeds for commentary - that feed's streaming to YT/FB is throttled, even at 720p/1.5 Mbps, even though 6 court feeds are all streaming fine at 1080p/3 Mbps at the same time.

Main feed is an i9, with 4060 series Intel GC, vMix Max (Pro subscription). CPU Mem is less than 20% while this is occurring.

If I stream to another host site outside YT/FB on the "main feed"; I can stream 1080p/6 Mbps with zero issues.

Has happened at two of my last three events after 3 years of zero issues; ended up using another "court" laptop with vMix Basic to push the Main Feed stream out to YT/FB with zero issues.

Possible something changed on the Main Feed laptop during a Windows Update, but what?

Thanks for any assistance.


Phew, difficult one...

First I would try to find out if realy this laptop is the culprit or if some complicated network issue hit you during the show and by accident affected the Main laptop.

What do you mean by ""Main Feed" pulls in court feeds for commentary" - does this laptop read the streams from all other laptops? If yes, what kind of stream are we talking here: RTMP, SRT, NDI, which bitrate, which codecs?

Please give some more details on the network setup and the network load involved.

What kind of connection did you use for upstream to the internet?

Best,

Christian


Appreciate you taking the time to respond!

With it happening on two different occasions, in two different places hundreds of miles apart, with two different ISP's - I'm thinking it might be a laptop issue.

Upload speeds were 50+ Mbps at each location - only used 15-18 Mbps of bandwidth at each location (streamed court feeds @ 1.5Mpbs/720p, Main at 3 Mpbs/1080p)

I use the built-in vMix NDI to "bring in" the court feeds into the Main Feed. I've never made any adjustments to the NDI on any of the laptops.

Wired connection between all laptops, wired to the host centers main switch that had no firewalls/port issues.
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Phil Brylow  
#5 Posted : Thursday, May 8, 2025 12:33:38 AM(UTC)
Phil Brylow

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Originally Posted by: mavik Go to Quoted Post
The fastest approach would be to reinstall windows and vmix. Otherwise is like finding a needle in the hay stack


Appreciate you taking the time to respond!

Going to try this approach shortly. Thanks!
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beachvolleyballmedia  
#6 Posted : Wednesday, May 21, 2025 12:00:21 AM(UTC)
beachvolleyballmedia

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Hey Phil!! I am interested in using this software to also stream sporting events, multiple courts all streaming to their own separate live stream on youtube while still being able to pull each video feed into a main broadcast.

Are you aware of how many simultaneous streams this software allows? I am hoping to achieve up to 8 courts (8 separate livestream) in addition to the 9th stream that combines all video feeds.

Thanks for any insight here!

- Nathan
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Phil Brylow  
#7 Posted : Wednesday, May 21, 2025 2:23:57 AM(UTC)
Phil Brylow

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Location: Wisconsin

Thanks: 5 times
Originally Posted by: beachvolleyballmedia Go to Quoted Post
Hey Phil!! I am interested in using this software to also stream sporting events, multiple courts all streaming to their own separate live stream on youtube while still being able to pull each video feed into a main broadcast.

Are you aware of how many simultaneous streams this software allows? I am hoping to achieve up to 8 courts (8 separate livestream) in addition to the 9th stream that combines all video feeds.

Thanks for any insight here!

- Nathan


Nathan,

I've sent out 12 streams from one event (11 court, 1 main w/commentary) to YouTube, with a sufficient upload speed. I would think that available upload speeds would be the largest issue for the number of streams sent out to your streaming host.

I use the "Pro" (Max subscription) version of vMix.

The laptop I use for the "production booth/main feed" has a i9 processor & NVIDIA RTX 4080 graphics card - handles all the NDI inputs from the "court" laptops without any issues.

USB connected sound board (Mackie) for commentary on the Main Feed; and GT Designer is solid for creating any graphics needed (have 3rd party that handles score graphic overlays for the courts).

Hope that helps a bit.
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