Multichannel-Videos stutter at Decklink Quad 2

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Thomas Rudolph

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  • Joined: Tue Aug 28, 2012 11:26 am

Multichannel-Videos stutter at Decklink Quad 2

PostWed Mar 08, 2017 7:54 am

Hi Guys,

I tryed to use some 3rd party software to playout Videos on Decklink Quad 2.

I used to try TvVideoGrabber and VideoLab. Both components have been able to Capture on all 8 Inputs.
Also they have been able to playout 1 Video on 1 Output - smooth.

As soon I have started another (even the same) video on an another Output-Channel both Outputs are going into a slow motion effect. if 1 is finished the second is going to play in double speed for a while and then it runs normal, but as soon the Application trys to playout again a video on more than 1 Output it slows down. I was able to playout Videos parallel on all 8 Channels, but never saw them run smoothly.

I tryed to play them by using a normal system. Later I tryed an older but strong version of HP Z800. And finally I used the latest CAD Workstation. on all systems it was not running smoothly, when 1 used more than 1 Channel.

I have contacted the developer of the components, but did not getting back something.
So I wonder - Is there something I am doing wrong? Is the card really able to playout Videos in 1080i50 parallel on 8 Channels?

Thanks for your ideas and feedback

Is there something else I have to be aware?
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Adam Simmons

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  • Location: UK

Re: Multichannel-Videos stutter at Decklink Quad 2

PostWed Mar 08, 2017 9:21 am

Make sure you have it installed in a PCI-e 8x slot or better. Even though the length of the slot may be sufficient it may not have pins above a 4x so you need to check that. Also check the slot isn't shared with anything
DVC Built Clevo P775DM3-G Laptop with UHD screen, 7700K CPU@4.9Ghz, Geforce GTX 1060 6GB GPU, G-Sync UHD screen, 500GB M.2 Primary, 1x 480GB SSD, 1x1TB M.2, 1x 2TB Video drives.
Building Bespoke Video Editing systems for over 16 years
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Thomas Rudolph

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Re: Multichannel-Videos stutter at Decklink Quad 2

PostWed Mar 08, 2017 10:12 am

Hi Adam,

thx for reply.

The card is installed in a full 16-Lane-Slot. So tis should be fine.
Is there any Software wich I could use to test all 8 outputs parallel with videos?

Maybe it´s the software I used. Even the MediExpress is only able to use 1 Channel. If I start 2 instance of this tool only the focused application is playing out something. Strange!
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Tom_Bassford

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  • Location: Europe / UK

Re: Multichannel-Videos stutter at Decklink Quad 2

PostWed Mar 08, 2017 11:24 am

Try CasparCG - it can be configured for multistream output
http://www.atemuser.com
if it was easy it wouldn't be called engineering
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Dave Johnstone

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  • Location: Adelaide

Re: Multichannel-Videos stutter at Decklink Quad 2

PostThu Mar 09, 2017 9:33 am

Even the MediExpress is only able to use 1 Channel. If I start 2 instance of this tool only the focused application is playing out something.

There is an option in Preferences which allows playback when in the background.

Regards,

Dave.
Freelance Television Broadcast Engineer
and Software Programmer.
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Thomas Rudolph

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Re: Multichannel-Videos stutter at Decklink Quad 2

PostMon Mar 20, 2017 12:15 pm

I see what you mean. Perfect.
Currently the card is not really working!

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