[Bug]: Inconsistent quality

[anuzellig]

Operating System

macOS 26.3.1

Installation Method

uv sync

GPU/Hardware (Optional)

Apple M5 Pro 24 GB RAM/VRAM

Steps to Reproduce

Used the EZ-CorridiorKey GUI:

1. BiRefNet set to "Matting" for automatic alpha hint generation (found that GVM produces just a black screen).
2. Run inference with either the higher or lower model resolution version.
3. Certain frames (about half) are much lower quality than the rest, with the rest more closely resembling the alpha mask hint compared to the problematic frames (images attached below).

Good frames:

Problematic frames:

Update 3/17/26
The problem still occurs with version 1.8. Tested with a machine running Windows with a 10 GB RTX 3080 and the problem does not occur.

Expected Behavior

All frames generate with higher or similar quality to the alpha hit, rather than noticeably lower.

Actual Behavior

Certain frames (about half) are noticeably lower quality than the alpha hint, with visible cutoff of the subject and green screen bleed.

Relevant Logs or Error Messages

No error logs.

Workaround (if available)

No workaround found.

Verification Checklist

• I've verified this bug hasn't been reported before
• I can reproduce this issue consistently
• I've included all relevant logs, screenshots, and error messages
• I've tested with the latest version of the project

[nikopueringer]

still having this issue?

[anuzellig]

Just tested with your most recent update instead of EZ-CorridorKey and the problem doesn't occur. Thanks!