H264 PRO RECORDER & SDK

Hi
I just got a H264 pro recorder and try to do some basic control through SDK in my application. I try to get the iterate all the decklink device and get IDECKLINK object through the following code.

Code: Select all

IDeckLinkIterator *iter;
IDeckLink *dl = NULL;
CoInitialize(NULL);
CoCreateInstance(CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL, IID_IDeckLinkIterator, (void**) &iter);
iter->Next(&dl);


But no device could be found, But it do work with Blackmagic Media Express. Could anyone plz show me where is wrong, or send me a sample code for reference. Thanks a lot.
Best Regards
Yun

I have find some tricks to use IBMDStreamingDiscovery as a start to find the IDeckLink. I have install Desktop Video 10.5 on windows 7. But when i try to get the IBMDStreamingDiscovery Object through coCreateInstance with id CLSID_CDeckLinkIterator, the function failed to get the object. Could someone plz give me a little clue about how this happened? Thanks

[Nicholas Gill]

Hi Yun,

Regarding the first question, IDeckLinkIterator [1] enumerates the devices which support uncompressed capture via the DeckLink API.

As you have already identified, devices supported by the Streaming API are discoverable via the IBMDStreamingDiscovery [2] interface.

The StreamingPreview sample (Win\Samples\Streaming\StreamingPreview\) demonstrates performing a streaming encoder capture operation, using MediaFoundation (on Windows) to preview the captured H.264 stream.

Please note that the Streaming API is only available as a 32bit COM library on Windows. Assuming that the Desktop Video drivers are installed correctly, this is the next most likely explanation why your application is not able to create an instance of the IBMDStreamingDiscovery interface.

Cheers,

-nick

[1] 2.5.1 IDeckLinkIterator Interface
[2] 2.6.1 IBMDStreamingDiscovery Interface

Thanks a lot for your reply, I think that maybe the problem.