I just bought and installed the following hardware:
- Blackmagic DeckLink Quad HDMI Recorder
- Sonnet Echo Express SE III
I connected it to my MacBook Pro 13" (2020) with Mac OS X 10.15.7 installed. Then I installed Blackmagic Desktop Video 11.6 and opened mimoLive 5.8. Unfortunately, I noticed that both video and audio are not captured correctly. The video is not fluid, and the audio is distorted.
The video source is a Dell XPS 13" connected to the Blackmagic DeckLink Quad HDMI Recorder via a USB-C > HDMI cable. I also tried to use a different USB-C > HDMI cable, but the result did not change. Note: both cables I used work perfectly with an external display.
Thinking that the problem was software related, I downloaded and installed version 11.5.1 of Blackmagic Desktop Video. Using the latter, the audio recorded by mimoLive is correct, but the video is not fluid, and there are numerous frames dropped during recording. Indeed, the mimoLive “Render Performance Monitor” shows very high CPU usage.
Then I made some tests with the Blackmagic Media Express application. With that application, both using version 11.5.1 and version 11.6 of Blackmagic Desktop Video, the audio is okay, and the video is almost okay (better than with mimoLive).
Nota bene: the same problems encountered with mimoLive are present with QuickTime Player.
Now the question is: should I return the Blackmagic DeckLink Quad HDMI Recorder card?