Toggling `audio-pitch-correction` values via hotkey does not work until seeking or changing speed (audio files only)

[bastimeyer]

mpv Information

$ pacman -Q mpv
mpv 1:0.40.0-7

$ mpv --version
mpv v0.40.0-dirty Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Sep 24 2025 17:56:15
libplacebo version: v7.351.0
FFmpeg version: n8.0
FFmpeg library versions:
   libavcodec      62.11.100
   libavdevice     62.1.100
   libavfilter     11.4.100
   libavformat     62.3.100
   libavutil       60.8.100
   libswresample   6.1.100
   libswscale      9.1.100

Other Information

- Linux version: Arch Linux
- Kernel Version: 6.17.2
- GPU Model: irrelevant
- Mesa/GPU Driver Version: irrelevant
- Window Manager and Version: irrelevant
- Source of mpv: Arch Linux extra repo
- Latest known working version: n/a
- Issue started after the following happened: n/a

Reproduction Steps

I've noticed the issue after adding p cycle audio-pitch-correction to my input.conf.

Issue

The --audio-pitch-correction={yes,no} CLI argument is applied correctly, same as the mpv.conf value, but when toggling the value via a hotkey after opening an audio file, the audio-pitch-correction is not applied immediately and requires seeking or changing the playback speed.

As mentioned in the issue title, this appears to be only the case for audio files. Video files do not seem to be affected, and everything is working as intended. I've tested this with many different media files (with different container formats and codecs).

input.conf example:

p cycle audio-pitch-correction
[ add speed -0.1
] add speed 0.1
BS set speed 1.0
RIGHT seek  5
LEFT  seek -5

# FISH (can't post a BASH cmd, because --input-conf=<(cat HEREDOC) doesn't work - FISH's psub uses tmp files instead)
$ mpv --no-config --audio-pitch-correction=no --input-conf=(echo -e '
p cycle audio-pitch-correction
[ add speed -0.1
] add speed 0.1
BS set speed 1.0
RIGHT seek  5
LEFT  seek -5
' | psub) "$MEDIA_FILE"

Audio file

1. Open audio file
2. Change speed
3. Toggle audio-pitch-correction -> no change
4. Seek or change speed again -> change applied

Video file

1. Open video file
2. Change speed
3. Toggle audio-pitch-correction -> applied immediately

Expected Behavior

Toggling the audio-pitch-correction value via the hotkey should work immediately.

Actual Behavior

Seeking or changing speed is required in order for the changed audio pitch correction value to take effect.

Log File

mpv.log

Sample Files

No response

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.