Pipewire output shows erratic behavior.

[X6B]

mpv Information

mpv v0.39.0-521-g96bebf0935 Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
 built on Dec 21 2024 09:11:15
libplacebo version: v7.349.0
FFmpeg version: n7.1
FFmpeg library versions:
   libavcodec      61.19.100
   libavdevice     61.3.100
   libavfilter     10.4.100
   libavformat     61.7.100
   libavutil       59.39.100
   libswresample   5.3.100
   libswscale      8.3.100

Other Information

This is on Archlinux / Plasma 6 / Wayland.

Reproduction Steps

mpv --no-config -ao=pipewire videofile; create an A-B loop with L key.

Expected Behavior

Uninterrupted sound as in the pulse output.

Actual Behavior

Every time the loop starts, there are a few milliseconds of silence and you can see errors in pw-top.

Log File

output.txt

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.

[t-8ch]

I can't reproduce this. There is a tiny crackling but no error in pw-top.

When you say "pulse output" do you mean --ao=pulse over pipewire-pulse or real PulseAudio?

Can you reproduce it with a command like

$ ffmpeg -f lavfi -i "sine=f=1000:d=10" out.wav
$ mpv --ab-loop-a=1 --ab-loop-b=2 out.wav

[X6B]

Yes, --ao=pulse over pipewire-pulse.

I can´t. In this sample the sound is perfect using pipewire output and no errors in pw-top.

I have found that the larger the video file (not in size or duration, but in video quality), the more errors appear in pw-top each loop using the pipewire output. In a small video the errors are one at a time, in a large video 10 errors can appear in each loop. In large videos, using the pulse output, the sound is interrupted this time, but no pw-top errors are visible.

I am using the latest stable version of pipewire.