[GamepadUI] - Steam intro movies sometimes play with double audio

[matte-schwartz]

Your system information

• Steam client version (build number or date): 1736213535
• Distribution (e.g. Ubuntu): CachyOS (Arch Linux)
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes
• Steam Logs: N/A
• GPU: AMD Z1 Extreme (Phoenix APU)

Please describe your issue in as much detail as possible:

When viewing Steam custom intro movies, either during Steam client launch or their previews in the Customization section, the movies will sometimes play with what sounds like double audio. This seems to happen only 50% of the time but it leads to heavy audio distortion when it does happen.

Attaching videos below of a "normal" sounding intro vs a "bad" sounding intro, where volume was kept the same between both clips:

NORMAL

IMG_2615.mov

DOUBLE

IMG_2614.MOV

This was not an issue I experienced before today's Steam Deck beta client update, 1736213535

Steps for reproducing this issue:

1. Choose any intro movie from the Customization menu and preview it
2. If it sounds normal, try a few more times