Hardware acceleration (VAAPI) produces red-green video artifacts or on rare occasion due to incorrect use of NV12

mpv Information

mpv v0.40.0-dirty Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Jul 29 2025 22:35:55
libplacebo version: v7.351.0
FFmpeg version: n7.1.1
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:
NAME="Arch Linux"
PRETTY_NAME="Arch Linux"

- Kernel Version:
Linux Apsida 6.15.9-arch1-1 #1 SMP PREEMPT_DYNAMIC Sat, 02 Aug 2025 01:20:06 +0000 x86_64 GNU/Linux

- GPU Model:
2d:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 22 [Radeon RX 6700/6700 XT/6750 XT / 6800M/6850M XT] [1002:73df] (rev c5)

- Mesa/GPU Driver Version:
OpenGL version string: 4.6 (Compatibility Profile) Mesa 25.1.7-arch1.1

- Window Manager and Version:
wayland 1.24.0-1 (Arch repo)

- Source of mpv: Arch repo

- Latest known working version: - 

- Issue started after the following happened:
Video playback on specific video recorded on my phone

Reproduction Steps

Video playback on a specific video using VAAPI hardware acceleration causes weird green-red artifacts to show up. Here are some screenshots of both playback with hardware acceleration and not:

VAAPI

Software

Issue happens both with normal mpv execution and with --no-config. Weirdly, this has only happened once. No other video that I have recorded on my phone (that I have played back on my computer) has presented the same issue. I recorded a few videos to test if maybe the format that my camera app records to is incompatible, but all 5 of them had no errors/artifacts with both VAAPI and software decoding.

Expected Behavior

Normal video playback with no artifacts

Normal playback (Software decoding)

Actual Behavior

Green-red lines during playback

VAAPI

Log File

nv12_error.txt

Sample Files

https://www.mediafire.com/file/kvv1171b6278j58/NV12_problem.mkv/file

This is a portion of the original video file (cut with ffmpeg so the video stream is the same) that still presents the same problem. The original video was me recording myself opening a delivery due to the box being in a bad shape, so for obvious reasons, I can't provide the original.

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 by reproducing the artifact with the linked NV12_problem.mkv sample and the attached nv12_error.txt log, comparing VAAPI playback with software decoding. Trace the VAAPI/NV12 handling involved in the playback path. Done means the sample plays normally with hardware acceleration without the reported green-red artifacts.