Blackmagic Capture Card doesn't play audio from version 0.32.0-713-gf57b90b069 and on

Important Information

Provide following Information:

• mpv version:
  • 0.32.0-690-gbb1f821078 Both Video and Audio Work (8/30 build)
  • 0.32.0-713-gf57b90b069 Video Works, No Audio (9/6 build)
• Windows Version: 10
• Source of the mpv binary: https://sourceforge.net/projects/mpv-player-windows/files/64bit/ the 8/30 and 9/6 builds
• If known which version of mpv introduced the problem: 0.32.0-713-gf57b90b069
• I've tested the latest build also and it's the same.
• Possible screenshot or video of visual glitches: Video works, the audio doesn't work in the above version and later versions.

Reproduction steps

Windows command:

mpv -v --demuxer=lavf --demuxer-lavf-o-add=video_size=1920x1080 --demuxer-lavf-o-add=pixel_format=uyvy422 --demuxer-lavf-o-add=framerate=59.94 --demuxer-lavf-o-add=rtbufsize=702000k "av://dshow:video=Decklink Video Capture:audio=Decklink Audio Capture"

Expected behavior

Audio should play.

Actual behavior

No audio plays.

Log file

0.32.0-690-gbb1f821078 (8/30 build) Working audio:

8-30-2020 Sound.txt

0.32.0-713-gf57b90b069 (9/6 build) No audio:

9-06-2020 No Sound.txt

Diff Images:

The logs are the same until the audio part:

If there's another command you need me to run ask.

Stream Data

I'll record the stream data on Monday.

Start with the reproduction command and compare the attached logs for 0.32.0-690-gbb1f821078 and 0.32.0-713-gf57b90b069, focusing on where audio handling diverges. Investigate the change range between those builds and verify that Blackmagic video and audio both play on Windows once the regression is resolved.