I just have gotten one of these Magewell Pro Capture HDMI cards...
I have just recently got a Magewell Pro Capture HDMI card...
the main reason i got this card was the spec sheet said 'Support for up to 8-channel IEC60958/IEC61937 audio streams', so basically capture 5.1 and 7.1 audio for your captures. Upon receiving the card i was unable to find an option to select 5.1 or 7.1 audio from there supplied Capture Software (Magewell CaptureExpress)....
I seemed that the card doesnt support 5.1 audio at all, so i contacted there support.....eventually i got a reply
"7.1 audio can only be captured by SDK interface. Maybe you can download MWCaptureSDK from website and reference to the example of MultiAudioCapture.
It demonstrates how to caputre 7.1 audio and save it to wave files."
in the zip file i found a program named, XID_MultiAudioCapture.exe, which indeed allowed me to capture 5.1 audio from my xbox one console, but just the audio no video!!. So in order for me to capture my gameplays along with 5.1 audio i need to run both the CaptureExpress software (for video) and XID_MultiAudioCapture software (for audio) AT THE SAME DAMN TIME. This to me seems ridiculous, if the hardware supports the ability for capturing 5.1 audio then why not include the option in there main capture software program rather than going the half arse way and making the user have to run 2 programs at once!!??, as it stands atm im left with 2 files, which isnt ideal really.
It would appear that you can use the SDK download to build your own program or drivers or something, what ever it is its completely out of my comfort zone.
Does anyone know of a capture software that has the ability to select 5.1 audio, otherwise i will probably send the card back as its not doing what it advertised!
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Maybe GraphStudio would work because the device has DirectShow drivers and is detected as a webcam. It's only a guess though because I don't have this device and DirectShow filters don't always allow access to every feature a capture device has to offer.
[Edit]I'm not sure you will like using GraphStudio any better than the SDK as it is essentially a software development tool.
Thanks for the suggestion I'll give it a go. Just seems like a complete oversight not include an option to select 5.1 audio in their main capture software and have a completely different bit of software that captures up to 7.1 audio ONLY. You would have thought that they would of pushed this as its probably one of the only consumer capture cards that actually has the ability to capture multichannel audio and would be a massive selling point if it was implemented correctly.
Guess I can only hope they update their capture software to include multichannel support in the future.
Does anyone know anything about SDK development?, is the SDK file linked above give the ability to actually build a capture suite that has both video and audio multichannel capabilities?
Last edited by usually_quiet; 20th Nov 2015 at 08:47. Reason: forgot about Media Foundation
The Magewell card seems to have 2 entries in the filter list...
Audio (00 Pro Capture HDMI) ACM/ICM
Audio (00 Pro Capture HDMI) PNP
When I suggested GraphStudio, I meant for you to attempt to use GraphStudio by itself for capturing or use the graph with a script. How much prior experience do you have building filter graphs with GraphStudio or GraphEdit?
Last edited by usually_quiet; 20th Nov 2015 at 21:50. Reason: Ask about source code
Regarding the source code for CaptureExpress, I though that was in the SDK.zip file from there website?
As I said early just seems super odd to not include an option to select 5.1 or 7.1 audio in their main capture software when the card is capable of doing it and is (as far as I know) the only card on the market that can capture multichannel over hdmi for capturing!
Last edited by BlockABoots; 21st Nov 2015 at 03:42.
It looks like you have built a filter graph before, but don't have a lot of experience with them. Building a graph for a new device often involves a lot of trial and error in selecting and configuring the filters. The WDM streaming crossbar for the capture device is first, then its WDM streaming capture filter, then the video encoder and audio encoder (you may not need an audio encoder), then the multiplexer (if you intend to multiplex the video and audio), and finally one or more dump filters to write the captured data to a file. Device configuration happens in the crossbar and capture filters. Unfortunately, since I don't have your capture device I can't offer device-specific help with this task.
Since this is HDMI, the audio is provided in digital form. It could be LPCM or a compressed format like AC3. I was thinking that it might be possible to capture the audio stream as is and write it to a dump file even if you can't multiplex it with the video stream in GraphEdit using the available multiplexers for your device.
I can't tell you why the ability to capture 5.1 or 7.1 audio isn't available in the included capture software. If the source code for the software is available, a good programmer with experience using DirectShow+Media Foundation might be able to modify it, but I can't give you any help with that. I don't know anything about DirectShow or Media Foundation programming.
Last edited by usually_quiet; 21st Nov 2015 at 13:01. Reason: clarity
Thanks for your help but this seems above my knowledge. I have tweeted Magewell asking if 5.1 and 7.1 can be enabled in an update for the CaptureExpress software. Im suprised there isnt other capture software about that allows to select multichannel audio
The problem of how to encode multichannel LPCM audio to other formats might be part of it. Licensing encoders adds to the cost of software.
So theres Blackmagic cards that support the capture of 5.1 audio over HDMI?, what issues do these blackmagic cards have then??
Whats these other Chinese frame grabbers you refer to please??
Looking at user reviews for these cards reveals many unhappy buyers. For one thing, these devices have system requirements which many PCs do not meet, but many buyers are unaware of this.
vaporeon800 has or had a Blackmagic Intensity Pro 4K, although he is mainly interested in analog capture, he did mention HDMI here
Thanks for the link, i got a replay back from Magewell. I ask the question weather the software team could add the ability to add 5.1 audio option in their CaptureExpress software., and the replay back...
"Thank you for your suggestion. Our Software Development team will think about it."
I dont think i can wait around for them to 'think' about adding this feature really and will have to send the card back. Maybe ill re-buy it in the future if they ever add 5.1 audio capture