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Multi Core CPU usage decoding RTSP
Rank: Member
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Joined: 5/11/2012(UTC) Posts: 23  Location: Norway Thanks: 2 times
Was thanked: 6 time(s) in 2 post(s)
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Hi Martin,
I finally got some new hardware (i7-4930K + NVidia 760) and to my big surprise it did not help me that much decoding Full HD from RTSP streams.
When I add more than four cameras I get delays - long delays, the stream is just buffered up in vMix.
After a little check I found out that only the first core of my nice new CPU was doing the work of decoding the streams.
The other 5 cores are doing noting, it did not even step up to the highest CPU frequency.
This can also explain why my old PC started building delays at around 30-35% CPU (because all cores where probably not used by vMix)
(I think I mentioned this in an old topic, but thought it was a poor old CPU and never checked)
I'm running Win 8.1 and the newest vMix 12 beta, but since I had the same problem on the old PC running Win7 and vMix 11 it is probably not something new.
Is there something I can do to distribute the load better on all the CPU cores??
Or do I have to ask you to do more of your magic?
If I miss something I'm sorry for the silly question...
If you can do something to vMix please consider this a Feature Request.
Best regards
KKR
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Rank: Administration
Groups: Administrators
Joined: 1/13/2010(UTC) Posts: 5,208 Location: Gold Coast, Australia Was thanked: 4288 time(s) in 1520 post(s)
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Can you confirm the vMix version is 12.0.0.86?
There have been a few 12 preview releases so just wanted to make sure.
It should use multiple CPU cores for decoding where available, so I will need
to investigate further if that is indeed the cause.
Regards,
Martin
vMix
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Rank: Member
Groups: Registered
Joined: 5/11/2012(UTC) Posts: 23 Location: Norway Thanks: 2 times
Was thanked: 6 time(s) in 2 post(s)
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Hi,
Yes 12.0.0.86 downloaded Saturday afternoon (http://www.vmix.com.au/download/vmix12preview.exe).
I had only Win8.1 (CLEAN from install Disc) and then vMix installed (so only codecs from you and Microsoft).
I tested normal playback of old recordings and that seems to run on all cores (did not really use much CPU).
I did recording MP4 (normally CPU hungry) and that seems to run on all cores also.
And together with some RTSP stream decoding I was able to trigger the highest CPU frequency (3.9GHz, no overclocking yet :-).
Later I added "Livestream for Producers" to the PC... and this application ramped up the CPU to MAX even before starting to encode (just by starting, CPU at 0%).
When starting encoding/streaming this application also ran all cores.
Hope this helps getting closer to the problem.
Best regards
KKR
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Rank: Administration
Groups: Administrators
Joined: 1/13/2010(UTC) Posts: 5,208 Location: Gold Coast, Australia Was thanked: 4288 time(s) in 1520 post(s)
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Hi,
Are you able to provide screenshot of task manager showing all of the cores
when playing multiple RTSP streams so I can see the utilisation?
Thanks,
Martin
vMix
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Rank: Administration
Groups: Administrators
Joined: 1/13/2010(UTC) Posts: 5,208 Location: Gold Coast, Australia Was thanked: 4288 time(s) in 1520 post(s)
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