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pesi  
#1 Posted : Saturday, December 1, 2018 5:15:10 AM(UTC)
pesi

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I am streaming ABR at 3 bitrates - 1.5 Mbps, 750 kbps and 400 kbps which totals 2650 kbps.
The upload speed of the Internet connection is 12 Mbps and the download speed is 80 Mbps.
Yet the stream (on my monitoring laptop as well as for all my 5 viewers) keeps freezing due to buffering, which requires us to refresh the browser constantly.
Does anyone know why this could be happening and what the solution might be?
Any advice would be greatly appreciated.

Note: total sending bitrate should be about 50% of your upload speed.
My total sending bitrate is about 20% of upload speed and buffering still happens (?)
sinc747  
#2 Posted : Saturday, December 1, 2018 10:14:13 AM(UTC)
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Possible causes for buffering...

1. Your laptop cannot process the video fast enough to display smoothly. My old Dell Inspiron 1521 AMD CPU laptop cannot handle 720p video. Just can't handle it.
2. Your tested internet speed may not really be your actual speed. I've tested speed before a broadcast and it was great. Once the broadcast started the internet slowed to a crawl. Why, is anyone's guess. I blame my ISP.
3. Your streaming PC may not be able to handle the load of encoding three streams.

Just some thoughts.

Hope this helps.

- Tom
DWAM  
#3 Posted : Saturday, December 1, 2018 8:30:56 PM(UTC)
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Buffering is usually due to CDN

If your streaming indicator does not turn orange this is not a vMix issue

BTW, you're not streaming "ABR", you're streaming multiple bitrates. ABR is precisely a totally different thing
pesi  
#4 Posted : Tuesday, December 4, 2018 6:17:50 AM(UTC)
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All the items you list check out and are OK...
1. My laptop is an i7 quad-core with 16 GB Ram and a dedicated graphics card with 2GB on board.
2. The Internet speed is WELL above that required for streaming (4 times more upload speed than needed for my needs)
3. Download speeds were 40 times more than required to view the monitored streams.
4. My laptop has been able to handle this and higher loads in the past.

I spoke with the CDN support (and no the indicator does not turn orange but stays a solid red) and they pointed out a couple of interesting things...
They suggest the following settings for streaming live:
1. A keyframe setting of 2 sec.
2. Threads: 4
3. Network Buffer: 20 sec.

Now I cannot find any of the above items in any vMix setting(?) - do they exist?

Also, I am pretty sure that in the not too distant past, on the advice from someone on this forum, in an effort to reduce latency, I had changed the Network Buffer from 20 to zero, but now am unable to find where I did that - maybe that is causing this issue. Any idea where I can find this setting?

Thanks.

Correction.
I found the 3 settings (and they are OK - 2, 4 and 20) but they are only show in the stream #1 - why is that?
Does that mean the same settings would apply to the other 2 streams?
mavik  
#5 Posted : Tuesday, December 4, 2018 5:55:03 PM(UTC)
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You will find the values in the stream profile
stream profile.PNG (47kb) downloaded 0 time(s).
thanks 1 user thanked mavik for this useful post.
pesi on 12/5/2018(UTC)
pesi  
#6 Posted : Wednesday, December 5, 2018 8:22:32 AM(UTC)
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Would checking the 'Strict CBR' box have any effect at all on the buffering issue? pro or con?
Also, is it better to stream using CBR or VBR?
DWAM  
#7 Posted : Wednesday, December 5, 2018 5:58:10 PM(UTC)
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Always CBR!
I remember I already told you this
thanks 1 user thanked DWAM for this useful post.
pesi on 12/12/2018(UTC)
Barney Box Lane  
#8 Posted : Thursday, December 6, 2018 8:12:34 PM(UTC)
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Originally Posted by: DWAM Go to Quoted Post
Always CBR!
I remember I already told you this


Thank you Dwam I always thought variable bitrate was easier on the stream and would work better
pesi  
#9 Posted : Wednesday, December 12, 2018 5:55:14 AM(UTC)
pesi

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Originally Posted by: DWAM Go to Quoted Post
Always CBR!
I remember I already told you this


Thanks DWAM - just blame it on senility! :-)

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