Converting libavcodec frame to mpv frame failed (ambisonic)

Important Information

Provide following Information:

• mpv version

mpv v0.37.0-573-g23c988b3e1-dirty Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
built on Mar 17 2024 19:32:18
libplacebo version: v6.338.0-58-g2385b367-dirty
FFmpeg version: N-114395-g657644492f
FFmpeg library versions:
libavutil 59.2.100
libavcodec 61.1.101
libavformat 61.0.100
libswscale 8.0.100
libavfilter 10.0.100
libswresample 5.0.100

• Platform and Version

Linux & Librempeg

• Source of the mpv binary

github, self compiled.

• If known which version of mpv introduced the problem

not relevant, new feature in libavutil

• GPU model, driver and version

not relevant, its an audio issue

• Possible screenshot or video of visual glitches

not relevant, its an audio issue

Reproduction steps

Play any audio file (.webm/opus 4ch) with "ambisonic 1" channel layout.

Expected behavior

Audio is actually played.

Actual behavior

mpv input.webm -af ambisonic does not play audio, spams repeated red colored spam messages of same content over and over again.

Log file

Message with:
"Converting libavcodec frame to mpv frame failed."
repeated over and over again.

Sample files

Download any ambisonic/360 webm/opus from YT.

Reproduce the failure with a 4-channel WebM/Opus file using the ambisonic 1 channel layout and the ambisonic audio filter. Start from the repeated “Converting libavcodec frame to mpv frame failed” message; done means the audio plays without repeated conversion errors.