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Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?

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Daniel Pisarski
Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?
on Aug 4, 2010 at 2:11:27 pm

We are interested in tracking down an application that would let us use the BlackMagic family of capture cards as Long-GOP, MPEG-2 ingest devices. The theorized architecture would be an application that is doing the encode to MPEG-2 in real-time, in memory, and writing the Long-GOP bytes to disk (as compared to an application that would capture to uncompressed or BM's MJPEG codec, then transcode after the fact, which obvious there are quite a few of!).

With big processors, GPU acceleration, etc., this seems like this should be possible, at least for standard def! Anyone ever seen anything like that, or from a company offering that?

All help is greatly appreciated!!

Dan
TelVue Corporation


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Joshua Helling
Re: Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?
on Aug 4, 2010 at 10:20:57 pm

Oh..it should be possible. There are cards that have hardware encoders on them that you could pass the signal off to in order to get a real time encode. But it should be possible for a beefy CPU and a proper application to get a capture of MPEG2 in real time via software (especially if you are going to SD, HD will be tougher).

Unfortunately I can't recommend a specific software, but they are out there.

You will want to look for an MPEG2 encoding software that can utilize a directshow input from a capture board.

Sincerely,

Joshua
Director of Support
Blackmagic Design Inc.


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Danny Hays
Re: Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?
on Aug 5, 2010 at 6:17:39 am

I would think that would have to be a Blackmagic made capture format, and not a non-Blackmagic capture app. Do you mean like an .m2t format?
Unless you need a transport stream mpeg for a server that needs that, why would you want that, just out of curiosity? Most people are looking for just the opposite.
You may be able to use an HDV camera that can use component in and output .m2t on the fly. .m2t has just 2 I frames per a 30 frame second. Hope this helps,
Danny Hays
Universal Studios Florida



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Daniel Pisarski
Re: Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?
on Aug 5, 2010 at 1:23:04 pm

You have it exactly right, the use-case here is to encode direct to a delivery format such as M2T (MPEG-2 Transport Stream), if the source material needs no further editing. As Joshua pointed out, there are cards with onboard DSPs that will encode direct to MPEG-2, but they are becoming more rare, and a software-only encode from a card like a BlackMagic has a lot of advantages - ability to upgrade or change the codec, the BlackMagic cards have all the right inputs with good OS support, etc.

Joshua is also right that the BlackMagic cards are DirectShow capture devices, so it need not necessarily be a codec that BlackMagic supports in their application, another application could use the card via DirectShow and pipe the uncompressed video into a codec that way.

I just need to find that application, if it already exists! I have not had success so far turning one up, as you point out, it is a bit of a different use-case then this type of card is usually used for.

Dan


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Brian Louis
Re: Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?
on Aug 5, 2010 at 9:18:29 pm

What are you going to be capturing from? and what type of video are you trying to capture?


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Daniel Pisarski
Re: Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?
on Aug 5, 2010 at 9:21:28 pm

Standard Def. Interested in both Composite and SDI input. Ideally, Closed Caption on line 21 included, but can certainly live without that if something met the other criteria.

Dan


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Claus-Peter Wolf
Re: Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?
on Aug 6, 2010 at 1:25:30 am

Hi Daniel,

try Mainconcept Reference v2 (you can download it as demo).
It´s a great program, you can select Decklink as input and capture
in every wanted codec....h.264, mpeg4,
Flash, in Blue-Ray, ipod, psp,p2, AVCHD, HDV, DV, XDCAM, DVCPRO and so on.... and your desired mpeg2.

Greatings from Cologne

Claus-Peter Wolf



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Daniel Pisarski
Re: Anyone seen an application that can capture from a BlackMagic card straight to Long-GOP MPEG-2?
on Aug 6, 2010 at 5:21:19 pm

Excellent Claus-Peter Wolf, that sounds like just what I am looking for, thanks so much!


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