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Playout looks like slow

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Playout looks like slow

Postby BRNO » 25 Jan 2017, 15:37

Hi all

We are currently testing a CasparCG as PoC and in this matter 1000 questions has been solved, i am however unable to crack this nut.

First let me clarify that we are on a unstable version 2.1.0 and on Windows Server 2012 R2 - why make it all easy right.
I have however experienced no unexplainable issues, seen any weird behavior until now.

The hardware I use for this PoC is overkill so I can't believe it breaks down to performance.
2x XEON CPU each with 8 Cores
K2200 Nvidia Quadro card
Decklink Quad 2
64GB RAM
500GB NVMe based internal storage

The problem im facing is that when i try to playout an MXF file exported in 25fps on a channel that is set to 1080i5000 it looks like slowmotion and audio stutters too, like it would if played on half speed.
If i look in the Caspar client and in the clip i try to play the lenght is 41secs, however when I play it runs for exactly the double lenght 82secs.

Does anyone has anything that I could try to change? If i play the clip in PAL video-mode everything is good, except for the picture quality obviously, as it is scaled to SD.

Regards
BRNO
 
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Re: Playout looks like slow

Postby silid » 25 Jan 2017, 16:33

Check your CPU throttling settings. I run at full performance.
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Re: Playout looks like slow

Postby didikunz » 25 Jan 2017, 16:34

BRNO wrote:The problem im facing is that when i try to playout an MXF file exported in 25fps on a channel that is set to 1080i5000 it looks like slowmotion and audio stutters too, like it would if played on half speed.


Is that exported to 1080p25? Could you try what happens when you export to 1080p50?
Didi Kunz
CasparCG Client-Programmer, Template Maker & Live CG-Operator
Media Support, CH-5722 Gränichen, Switzerland http://mediasupport.ch/
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Re: Playout looks like slow

Postby BRNO » 27 Jan 2017, 09:46

Hi there Didi and silid

The file is exported as 1080i50 as our entire broadcast chain is 1080i50

Sure, I can try to export it as as 1080p25 (or convert it into,just to see how Caspar then handles it).

As what goes for perfomance this server is nowhere near saturation. Last we measured CPU,MEM and Disk latency values was so good that i'm more than sure that performance isn't the issue here.

I'll try to play some MP4 as well and get back if it changes anything.

Btw my blackmagic driver version 10.8.1 - i'll also try updating that into 10.8.4
BRNO
 
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Re: Playout looks like slow

Postby BRNO » 27 Jan 2017, 17:26

A couple of things worth mentioning

After i removed all screenconsumers and applied 10.8.4 video/audio started to play 99.99% smooth

I can however still hear a little scratch when starting a new clip MXF/MP4 or when I add a flashtemplate to the channel.

CPU and MEM is never above 12% utilized.
BRNO
 
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Re: Playout looks like slow

Postby String_Theorist » 12 Mar 2017, 08:57

Interesting, I had the same problem on my machine. I'm running linux (Ubuntu Studio 16.04), and outputting to Decklink Mini Monitor 4K cards.

I found that by disabling the 1080PsF setting on the Decklink cards via desktop video, it got the playback working 99%. It seemed like it had something to do with the way Caspar/ffmpeg scaled the frame rates. Different source videos had different results.

Anyway, I ended up reinstalling the operating system, and included all the codec packages etc, and it then worked well. So the problem is I don't actually know what fixed it.

Might be worth checking your ffmpeg build?
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