Possible Memory Leak with JXL/WebP/AVIF Screenshot Formats

mpv Information

mpv v0.41.0+git20260309.07c3ff3725 Copyright © 2000-2026 mpv/MPlayer/mplayer2 projects
libplacebo version: v7.360.1
FFmpeg version: 8.1
FFmpeg library versions:
   libavcodec      62.28.100
   libavdevice     62.3.100
   libavfilter     11.14.100
   libavformat     62.12.100
   libavutil       60.26.100
   libswresample   6.3.100
   libswscale      9.5.100

Other Information

- Linux version: openSUSE Tumbleweed
- Kernel Version: Linux mantari 6.19.11-1-default #1 SMP PREEMPT_DYNAMIC Thu Apr  2 16:41:45 UTC 2026 (b4a2f1c) x86_64 x86_64 x86_64 GNU/Linux

- GPU Model: 00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a06] (rev 0b)

- Mesa/GPU Driver Version: Mesa 22.2.5 (LLVM 15.0.7)
- Window Manager and Version: niri 25.11 
- Source of mpv: main repo opensuse
- Latest known working version: 0.40.0 (normally does not have this issue)
- Issue started after the following happened: 0.41.0

Reproduction Steps

Try opening the video with mpv video.mp4 --no-config --screenshot-format=jxl, then try taking burst screenshots.
WebP and AVIF are affected too. JPEG is practically normal.

Expected Behavior

No memory leak occurs; RAM usage should normally stay under 300 MB like version 0.40.0.

Actual Behavior

Memory usage leaks up to 1–2 GB, or even until system memory is full, causing severe lag and OS hangs.

screenrecord

Log File

output.txt

Sample Files

No response

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

• I tested and confirmed that the issue exists with the latest release version or newer.
• 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.

Reproduce the leak with mpv video.mp4 --no-config --screenshot-format=jxl and burst screenshots, then compare the behavior with version 0.40.0 using the attached output.txt log. The fix is complete when JXL, WebP, and AVIF screenshot bursts no longer cause unbounded memory growth and remain near the expected memory usage.