Audio distortion, bit crushing sounds randomly with Blackmagic Intensity Pro PCI & Wirecast
Windows 10 Pro / 64bit
Intel i7 3930K CPU 3.2GHz, 32GB RAM, GTX980
Blackmagic ATEM 1M/E 4K, HDMI
Blackmagic Intensity Pro PCIe
Audio mixed externally and married to picture in ATEM switcher and sent to WC via HDMI Program Out
While encoding, audio will suddenly randomly ramp up some digital distortion/sampling error noise, then the audio is bit crushed and distorted and maintains like this. Only fix is to reboot WC. The issue had been existent in the past but in a slightly different flavor, where the noise introduced was a little different and there was a ping-pong stereo effect.
I've seen direct posts on the exact hardware with the exact issues but forum-wise, there is not a publicly posted remedy or legitimate cause. The early signs of this audio issue (with the same hardware) came about over a year ago when the PC was on Windows 7 and upgraded to WC 6.x.x. What I believe is happening is there is some type of wordclock type issue between the Intensity card (which samples at 48KHz) and Wirecast (which, in all of my output settings, encodes at 44.1KHz). One test that I have not ran, which I am currently running as I write this post, is to set all of my encodes, whether it be record-to-disk or live stream, to have an audio sample rate of 48KHz instead of 44.1KHz.
The error may happen 15 minutes into a stream, 60 minutes, or it (very rarely) will not occur within a 60 minute broascast/record at all.
Rolling around Desktop Video drivers and Wirecast versions has not made a difference. Although we've only gone to WC 6.x, 7.x versions and Desktop Video 10.6.x, 10.7.x and 10.8.x versions
Any help is greatly appreciated, thanks!
Please do fill out the form and report the issue. If you can link to short excerpt exhibiting the issue that will help. Note the specific drivers you tested with in the support form and/or link to this forum thread as well.
Wirecast Support Form
I already had a meeting scheduled with two technicians who were a no-show and have not heard from them since. Also, I already filled the form and started a ticket and the person managing that is not responding. We are mission critical here and getting nowhere.
The quickest link I can send where you can hear the issue is not my content, rather it's from another WC user having the same issue in the forums here:
If you've filled out the form and received a case number you can follow up by email with the case number and ask for a status report. Keep in mind if the fix involves updates it takes time to troubleshoot the cause and may involve work from Blackmagic as well.
We do have a premium service which expedites contact although any coding work is still going to take time.