Merge remote-tracking branch 'upstream/main' into gap-mkv-codec-delay

docs/gaps.md

@@ -141,7 +141,8 @@ platforms** G4, G9, G17; **performance** G16; **ecosystem** G11; **measurement**
   rearrangement (#493); clicking empty space to deselect (#683); filmstrip thumbnails (#614);
   marquee selection in the Project panel (#578); Freeform bins and middle-mouse pan (#579);
   Program monitor Button Editor (+) (#431); keyframe curves for Position (#448); transition
-  editing controls (#577); track renaming (#654); window controls on macOS (#637); UI scale on
+  editing controls (#577: Effect Controls has the transition's own timeline, drag to slide or resize;
+  the A/B previews with Start / End sliders remain); track renaming (#654); window controls on macOS (#637); UI scale on
   X11 (#457).
 - **Estimate:** 120–200 h. Doc: [ui-parity.md](ui-parity.md).
 
@@ -154,12 +155,20 @@ platforms** G4, G9, G17; **performance** G16; **ecosystem** G11; **measurement**
 
 ## G10. Container and codec gaps on import
 
-- **Missing:** E-AC-3 (#647; our AC-3 decoder refuses bsid 11–16), AVI (#598; listed as an
-  extension but no demuxer), WMV / ASF, DV / DVCPRO / DV100, MPEG-4 Part 2, FLAC in MP4 (#603),
-  camera RAW (R3D incl. R3D NE, ARRIRAW, Sony RAW / X-OCN, Canon RAW, BRAW, ProRes RAW; #345,
-  #383), JPEG 2000 / JPEG XS MXF, Cinema DNG; stills: PSD, EXR, DPX, Targa, HEIF / HEIC, Radiance
-  HDR, AI / EPS; transparent video (#402); Sony start timecode in `rtmd` (#460); stereo 3D flag
-  (#500); MKV multi-audio (#601).
+- **Have:** E-AC-3 (Dolby Digital Plus) in MP4, MOV, Matroska and MPEG-TS (#647): independent
+  substream, 1–6 blocks per syncframe, spectral extension. MP2 (MPEG audio layer II) in MP4 and
+  MOV, sample-exact against ffmpeg (#800).
+- **Missing:** MP2 at bit rates ISO/IEC 11172-3 disallows: mono above 192 kbit/s (ffmpeg's default
+  for mono MP2 is 384 kbit/s) and stereo below 64 kbit/s; the bootstrap decoder (symphonia, also
+  0.6) rejects every such frame, so the track plays silent: needs our own layer I/II decoder.
+  E-AC-3 adaptive hybrid transform, enhanced coupling and the extra channels of 7.1 dependent
+  substreams (played as the 5.1 core), AVI (#598; listed as an extension but no
+  demuxer), WMV / ASF, DV / DVCPRO / DV100, MPEG-4 Part 2, FLAC in MP4 (#603), camera RAW (R3D
+  incl. R3D NE, ARRIRAW, Sony RAW / X-OCN, Canon RAW, BRAW, ProRes RAW; #345, #383), JPEG 2000 /
+  JPEG XS MXF, Cinema DNG; stills: PSD, EXR, HEIF / HEIC, Radiance HDR, AI / EPS, and the rarer
+  DPX layouts (packed 10/12-bit, run-length, Y'CbCr; Targa and DPX stills and sequences import
+  since #821, deeper than 8 bits kept at 8); transparent video (#402); Sony start timecode in
+  `rtmd` (#460); stereo 3D flag (#500); MKV multi-audio (#601).
 - **Estimate:** 120–200 h (camera RAW alone 60–100 h, and some SDKs have licences we cannot use:
   clean-room from public specs only where specs exist). Docs: [codec-parity.md](codec-parity.md),
   [file-format-parity.md](file-format-parity.md).
@@ -185,17 +194,19 @@ platforms** G4, G9, G17; **performance** G16; **ecosystem** G11; **measurement**
 ## G13. Delivery formats
 
 - **Missing:** AV1 export (software or hardware), MPEG-2 / DVD / Blu-ray, DCP, JPEG 2000 MXF,
-  AS-10 / AS-11, XDCAM HD MXF, P2, EXR / DPX / Targa / JPEG sequences, MP3 and AAC-only audio,
-  ProRes 4444 / XQ in the export UI (#342; the encoder has the profiles), interlaced encoding,
-  smart render, HEVC software encoder (HEVC exists only where a hardware encoder does).
+  AS-10 / AS-11, XDCAM HD MXF, P2, compressed (ZIP / PIZ / DWA) OpenEXR, MP3 audio, interlaced
+  encoding, smart render, HEVC software encoder (HEVC exists only where a hardware encoder does).
+- **Have:** PNG, TIFF, BMP, JPEG, Targa and DPX (10-bit) image sequences (#779); OpenEXR
+  sequences (half float, linear, uncompressed; #806); AAC Audio (audio-only `.m4a`, or ADTS
+  `.aac`; #814); ProRes 4444 / 4444 XQ in the export UI (#342).
 - **Estimate:** 60–110 h. Doc: [file-format-parity.md](file-format-parity.md).
 
 ## G14. Localization: 8 of the 12 key languages missing
 
-- **Have:** Spanish, Japanese and Simplified Chinese catalogs cover ~99.6–99.9% of the ~3,500
-  cataloged strings; Portuguese (Brazil) and Ukrainian ~10% (menus).
+- **Have:** Spanish, Japanese, Simplified Chinese and French (#498) catalogs cover ~99.6–100% of
+  the ~3,500 cataloged strings; Portuguese (Brazil) and Ukrainian ~10% (menus).
 - **Missing:** Hindi, Arabic (no RTL interface layout; Arabic titles reported broken, #395),
-  French (#498), Indonesian, German (#490), Korean (#508; needs Hangul fonts in craft-fonts),
+  Indonesian, German beyond menus (#490), Korean (#508; needs Hangul fonts in craft-fonts),
   Vietnamese, Portuguese beyond menus; Premiere also ships Italian and Russian. Engine errors,
   CLI and MCP stay English. No language has a recorded native-speaker review.
 - **Estimate:** 150–230 h. Doc: [localization-parity.md](localization-parity.md).
@@ -224,10 +235,15 @@ platforms** G4, G9, G17; **performance** G16; **ecosystem** G11; **measurement**
 
 ## G18. Effects depth: approximations and missing behaviour
 
-- **Missing:** Warp Stabilizer is 2-D (Premiere's is 3-D subspace), Morph Cut approximate, optical
-  flow renders as frame blending, Transform shutter angle adds no motion blur (#415), Ultra Key
-  Setting scales only two factors (#458), Lumetri HDR-aware maths, multicam paging beyond 16
-  angles, redesigned 26.0 mask tools (rounded corners, constrained lines).
+- **Missing:** Warp Stabilizer is 2-D (Premiere's is 3-D subspace), Morph Cut has no face tracking
+  (and occlusion edges are soft), Lumetri HDR-aware maths, multicam paging beyond 16 angles,
+  redesigned 26.0 mask tools (constrained lines; an on-monitor corner-roundness handle).
+- **Have:** Optical Flow time interpolation synthesises motion-compensated in-between frames (dense
+  coarse-to-fine Lucas–Kanade, CPU; #780); Morph Cut morphs the subject along that optical flow
+  instead of cross-dissolving (CPU; #805); Transform shutter angle motion blur (#415); Ultra Key
+  Setting applied as a parameter preset (#458); rectangle and polygon masks round their corners
+  with circular fillets (`masks.add` `cornerRadius`, `masks.roundCorners`, every path keyframe;
+  #813).
 - **Estimate:** 60–110 h.
 
 ## G19. Speech to text off in release builds