Will do, its late here. Almost 1AM. Will try and report back tomorrow.
You should try removing system-audio from all the outputs and also try removing latency low. Also what file formats and disks are you using, if you’re files are very large, have you checked that disk I/O isn’t the bottleneck?
From memory thunderbolt 3 is only 4 lanes. I would expect utilising half the card to work fine though.
Are any of the other channels being used in some other software?
That is also my understanding. I think it’s a PCIe issue and not an I/O problem, as he says, that he does not have it with other cards and that he only plays one clip. But we will see.
This is very untrue. I can open up 4 instances of OBS and play out video from all 4 with NO issue. CasparCG has an issue if I setup more then 2 channels
Have you tried playing only in the first channel and routing it to the others?
If playback is OK there, you could try and tweak the FFmpeg threads setting in the config file. What’s the GPU usage when the problem happen?
If you still have problems, you can always use 4 running servers side by side, each one with two outputs.
Also double check the codec. If you use intra-frame compressed codecs, you might find some performance drops. I’ve had much better results using H.264. This issue was addressed partially in this post, and here is an example of that DeckLink working with six outputs from a single server instance (another one was outputting fill+key from the same card)
Thanks for this. I have tried H.264 and ProRes. Both do not work with the Quad 2. I have tried it with a Duo 2 and it works great.
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Did you reinstall decklink drivers after swapping cards and gone over the settings in Desktop Video (e.g. all set to individual outputs)?
I’ve done 8x 720P with a Quad2 and h264 files before.
Yes I have. This is super weird. I can’t even do 1 720p60 video playback in casparcg. But I can in other programs. This has legit drove me MAD.
So what i am going to do is a clean install of everything and will try to encode videos in h.264.
Ok everything reinstalled and still having the same issue with just the Decklink Quad 2. I have an extra UltraStudio Mini HD laying around, so I tried that and that works perfectly fine.
Hmmm… What about a hardware issue with this card? How long do you have it? Is there still a warranty? I would try with a replacement, sounds too weird.
I had a few of these running without problems, but with Caspar version 2.0.7, probably you can try with that version, just to make sure, that it’s not Caspar (did you mention the version you use? I did not find it now any more).
I have the same problem with Decklink Duo 2. My Caspar Version is 2.1.12 and my config file is pretty basic with only one cosumer. What i found ,if that helps anyway, is that when i set the embedded audio to false everything plays as it should.
The card is BRAND new. Like we just bought it to do CasparCG stuff from B&H. Currently running 2.3.3 server. I will give 2.0.7 a try. I may even try all the other versions.
Just tried several versions and still the same results. Tried 2.07, 2.2.0, 2.3.0, 2.3.1, and 2.3.2 still the same issue where if I have 1 channel plays perfectly fine. If I add another the video stutters and the audio is horrible. I think I will just throw videos on via UltraStudio Mini HD. As when I have all channels enabled with either the Mini HD or the Mini 4k the videos play PERFECTLY via the Ultrastudios.
@bifuteki
This seems to be a bottleneck somewhere.
If one of your PC have intel CPU and real PCIe slots (not via Thunderbolt bridge) check first how many electrical lanes the slot have, then check whether the slot have no shared lanes and select the one which have the lanes connected to the CPU directly not via internal bridge and then plug there.
Quad 2 is PCI Express 8 lane gen2. You can also check in BIOS whether is anything related to that slot.
(Duo 2 is 4 lanes only. It seems your problems occur when going from 4 lanes to 8.)
As @didikunz said:
Make sure that the card really get 8 PCIe lanes (not shared, not bridged)
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I use the free version of SiSoftware Sandra to check the PCIe lanes. That makes it easier.
Sometimes one need to disable some USB ports or such stuff in the BIOS to give a slot more PCIe lanes. Had a similar issue with my last PC, where I had only 4 SATA ports, unless I disabled a buch of unnecessary USB ports. So it is always good to check the BIOS doc very carefully.
Going to give both suggestions a go in a bit.
So just check and I am getting 2 results in the software you suggested, both X4. Does this mean its bridged?
You say, that on the PCIe slot the Quad 2 is placed it shows you two tomes 4x? If yes, that is normal, I saw the same, when I configured PC’s with two Quad 2 each. So that seems not to be the problem. That leaves us with no solution again. What is the spec of the HDD/SSD you play the videos from? Is it a dedicated drive or does it contain OS or other stuff?
Samsung 970 pro 1tb. Dedicated only for CasparCG.