autocrop.lua:209: attempt to index local 'hwdec_current'

mpv Information

mpv v0.40.0 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
libplacebo version: v6.338.2
FFmpeg version: 7.1.1
FFmpeg library versions:
   libavcodec      61.19.101
   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

- Linux version: Alpine Linux
- Kernel Version: Linux hyperion.whynothugo.nl 6.15.11-0-stable #1-Alpine SMP PREEMPT_DYNAMIC 2025-08-20 17:29:36 x86_64 Linux 
- GPU Model: Advanced Micro Devices, Inc. [AMD/ATI] Navi 31 [Radeon RX 7900 XT/7900 XTX/7900 GRE/7900M] [1002:744c] (rev cc)
- Mesa/GPU Driver Version: OpenGL version string: 4.6 (Compatibility Profile) Mesa 25.2.1
- Window Manager and Version: sway version 1.11
- Source of mpv: Distribution packages
- Latest known working version: unknown
- Issue started after the following happened: n/a

Reproduction Steps

mpv --script=/usr/share/mpv/lua/autocrop.lua path/to/file.mkv

Expected Behavior

Should autocrop.

Actual Behavior

Does not autocrop. Logs the following:

● Video  --vid=1               (h264 1920x1080 23.976 fps) [default]
● Audio  --aid=1  --alang=en   (eac3 6ch 48000 Hz) [default]
● Subs   --sid=1  --slang=en   'English'
… More subtitle languages omitted…
[autocrop] 
[autocrop] stack traceback:
[autocrop] 	/usr/share/mpv/lua/autocrop.lua:265: in function 'handler'
[autocrop] 	mp.defaults:522: in function 'call_event_handlers'
[autocrop] 	mp.defaults:564: in function 'dispatch_events'
[autocrop] 	mp.defaults:515: in function <mp.defaults:514>
[autocrop] 	[C]: at 0x557e28b61e00
[autocrop] 	[C]: at 0x557e28b623b0
[autocrop] Lua error: /usr/share/mpv/lua/autocrop.lua:209: attempt to index local 'hwdec_current' (a nil value)
Using hardware decoding (vaapi).
AO: [pipewire] 48000Hz 5.1(side) 6ch double
VO: [gpu] 1920x1080 vaapi[nv12]

Log File

https://gist.githubusercontent.com/WhyNotHugo/24924c4acf3943e325c355fa2d184c1d/raw/92632a0a16397bae0c12e0e8a67c5c25bee92f3c/gistfile1.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.

Start with the autocrop.lua handler at /usr/share/mpv/lua/autocrop.lua:209 and the event path reported at line 265, then compare the script's hardware-decoding lookup with the attached log. Reproduce with mpv --script=/usr/share/mpv/lua/autocrop.lua path/to/file.mkv and verify that autocropping completes without the hwdec_current nil-value error.