Decklink SDI audio output problem

[Luke Maslen]

Hi Harlan,

[hkingy] “When I play back the clip on the PC, audio is present.”

Do you play back the clip using Blackmagic Deck Control or some other application?

[hkingy] “However, when I use Decklink Deck Control and “Put” this clip back to tape, audio will not output to tape.”

If you are using QuickTime 6.5.2 or older, open the QuickTime

[Hkingy]

Hi Luke,

I forgot to mention I’m using Quicktime 7.1. The settings in the QT control panel are as follows:
Audio Tab
Default Device=Decklink Audio Device
Voice Playback=Decklink Audio Device

I am able to hear audio out of the SPDIF monitors when I play back from Blackmagic Deck Control app, Quicktime Player, Premiere Pro 2.0 and Vegas 6.0. In fact, audio and video are outputting through SDI to my tape deck when I hit ‘play’ in the timeline of those applications. I haven’t tried printing to tape yet in the NLE applications.

It’s when I do an auto insert to tape from Blackmagic Deck Control where the application isn’t telling the deck to record the audio channels. I have pretty much every preference in the PC pointing to Decklink output which is why this is so perplexing.

Harlan

[Hkingy]

Hi Luke, a few more things I’m noticing when using Blackmagic Deck Control. If you could let me know if these behaviors seem normal and whether this might be related to my audio problems:

1. When I play back a clip captured with BM Deck Control on my Windows PC, there is no moving video in the left capture window. (On our new G5 with DL Extreme, I see moving video in the left window on play out).

2. On the PC, the default audio monitoring preference is set to “Off While Recording”. I set it to “On” but it doesn’t change whether I can hear from the tape or not. After I hit OK, and I open that preference window again, it has reverted back to “Off While Recording” again. I can’t get it to stay on any other setting. (On the G5, there is no problem changing these settings and making them stick).

3. On the PC, I use Ctrl K to “Capture Now”, there is no indicator to tell me that I am recording. On the G5, when I do Cmd K, there’s a pop up that indicates I’m recording plus a “Stop Capture” button. Is this the correct behavior for the PC version?

4. On the PC, when I “Put” a clip to tape, I set an IN point for a 942 frame clip, my OUT point timecode displays some weird timecode like [00:33:>5] and [00:39:F2] and [00:40:D2] etc. The strange OUT time varies depending on where I set the IN point. However, it performs a correct length video insert edit to tape, just no audio.

The PC is using BM Deck Control v5.6
The Mac is using BM Deck Control v5.5.1

Thanks!

[Luke Maslen]

Hi Harlan,

Can you please run a comparison test with Premiere Pro and let me know if you can output video and audio from Premiere Pro and record the audio to your deck? This will tell us whether the problem is specific to Deck Control or more general. Once I know the answer to this question, I shall answer your other questions about Deck Control.

Regards,

Luke Maslen
Blackmagic Design

[Hkingy]

Hi Luke,

I just did an export to tape from Premiere Pro 2.0 and it worked great. Both audio and video was recorded to tape through SDI. Let me know if you think there’s an issue in my Deck Control app.

Harlan