OverlayWatermarkFilter.Position had no switch arm for MiddleCenter, so it
silently fell into the BottomRight default and rendered bottom-right.
OverlayWatermarkCudaFilter and OverlayWatermarkQsvFilter both inherit this
Position property without overriding it, so they were affected too (the
whole ErsatzTV.FFmpeg project has only this one WatermarkLocation switch).
- Add an explicit MiddleCenter arm: x=(W-w)/2:y=(H-h)/2
- Make BottomRight an explicit arm instead of the fallthrough default
- The default case now logs a warning (not throw - this runs on the
playback hot path constructing ffmpeg args, and sibling filters in this
project already use safe string fallbacks rather than throwing for an
unmapped enum) and falls back to the BottomRight position
- Strip the pre-existing UTF-8 BOM from OverlayWatermarkFilter.cs (#311
formatting gate: touching a legacy BOM'd file makes removing it ours)
- Add ErsatzTV.FFmpeg.Tests/Filter/OverlayWatermarkFilterTests.cs asserting
the exact position expression for every WatermarkLocation value across
the software, CUDA, and QSV overlay filters, plus the unmapped-value
fallback
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
timothyandClaude Sonnet 5