ImageExportSettings gains `fit: ExportFitMode` (default Letterbox) + a "Fit"
dropdown in advanced image settings; the image render path uses it instead of the
hardcoded Letterbox. Image export supports a resolution override, so the mode
matters when the override aspect differs from the document.
A) Imported video had a different aspect ratio depending on how it was placed:
direct import used a uniform scale + center (preserve aspect), while the
asset-library timeline drag used an independent scale_x/scale_y (stretch to fill).
Add Transform::fit_centered (uniform scale, centered, aspect-preserving) and route
both paths through it, so a clip looks identical however it's added.
B) Exported video was stretched when the export resolution's aspect differed from
the document's (base_transform was always scale_non_uniform). Add
ExportFitMode {Stretch, Letterbox (default), Crop} on VideoExportSettings + a "Fit"
dropdown in advanced export settings, and a shared export_base_transform() helper:
Letterbox = uniform fit centered (black bars), Crop = uniform fill centered (trim),
Stretch = the old distort-to-fill. Threaded through the software, HDR, and
zero-copy export render paths (image export is doc-sized → identity).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Settings + encoder side of HDR video export (frame data still SDR until pt 2):
- core: HdrExportMode {Sdr (default), Pq, Hlg} on VideoExportSettings (serde
default), with transfer-name helpers.
- setup_video_encoder takes the mode: HDR → YUV420P10LE, BT.2020 NCL matrix,
limited range, color_primaries=bt2020, color_trc=smpte2084/arib-std-b67,
profile=main10. SDR path unchanged (8-bit full-range BT.709).
- run_video_encoder forces HEVC when HDR is selected (the only 10-bit codec wired
up). encode_frame is parameterized by pixel format and now copies planes
row-by-row honoring stride (10-bit / non-aligned widths can have row padding).
Dormant: no UI exposes the mode yet and the frame data is still 8-bit SDR, so
selecting HDR is not yet wired. The render→PQ/HLG 10-bit frame path is pt 2.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The zero-copy VAAPI encoder emitted full-range BT.709 NV12 but wrote no color
tags, so players assumed limited range and stretched it — the H.264 output
looked dark and oversaturated (preview and VP9/software were fine).
- Rgba2Nv12 takes `full_range` and applies the matching Y/chroma scale+offset
(limited 16-235 / full 0-255) via a uniform; the encoder sets color_range +
bt709 colorspace/primaries/transfer tags to match. ffprobe-confirmed.
- New ColorRange { Limited, Full } on VideoExportSettings (default Limited, the
universally-correct choice; serde(default) so saved settings still load),
surfaced as a "Color range" dropdown in advanced export settings for H.264.
The swscale software fallback still emits Limited regardless of the toggle
(Full only affects the VAAPI zero-copy path).
Skyler Lehmkuhl