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#828: import PXR24-compressed OpenEXR

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Problem: OpenEXR files with PXR24 compression (a common lossy 24-bit
float format from renderers and compositors) were refused with "not
supported yet".

Fix: decode PXR24 chunks (16 lines, deflated byte planes of per-line
sample differences; floats keep their top 24 bits) into the existing
scan-line pipeline. Bounds-checked, no panics on damaged data. Tests:
hand-built chunks with half/float/uint channels and a partial last
chunk, damaged-file cases, and an OpenImageIO-written oracle comparing
our decode with OpenEXR's own (skips without oiiotool). Docs updated;
stale AVI / FLAC-in-MP4 entries removed from G10.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
vangel76
2026-10-12 20:56:26 +02:00
co-authored by Claude Sonnet 5.5
parent 71438c627b
commit af5d29310e
5 changed files with 182 additions and 11 deletions
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docs/file-format-parity.md
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@@ -1,6 +1,6 @@
# File format parity
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (new file: every file type Premiere Pro 26.5.2 reads or writes, against ours) · **Target:** Adobe Premiere Pro 2026 (26.5.2) and Media Encoder 2026
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** major (new file: every file type Premiere Pro 26.5.2 reads or writes, against ours) · **Target:** Adobe Premiere Pro 2026 (26.5.2) and Media Encoder 2026
Containers, stills, audio files, project and interchange files, captions and presets. Codecs inside
the containers are in [codec-parity.md](codec-parity.md). Our import list is
@@ -55,7 +55,7 @@ only). "Tested" names the evidence.
| PNG, JPEG, TIFF, BMP, GIF | read + write | yes | PNG / TIFF / BMP / JPEG sequences, GIF | 90% |
| WebP | — | yes | no | ahead |
| **PSD** (layers as sequence) | read (layered) | no | — | 0% |
| **OpenEXR** | read + write | stills and sequences: scan-line, none / RLE / ZIPS / ZIP, half / float / uint, RGB(A) or Y, kept as linear float (#828); no PIZ, PXR24, B44, DWA, tiled, multi-part or deep | sequences (half float, linear RGB / premultiplied RGBA; uncompressed, RLE, ZIPS or ZIP; #806, #874) | 70% |
| **OpenEXR** | read + write | stills and sequences: scan-line, none / RLE / ZIPS / ZIP / PXR24, half / float / uint, RGB(A) or Y, kept as linear float (#828); no PIZ, B44, DWA, tiled, multi-part or deep | sequences (half float, linear RGB / premultiplied RGBA; uncompressed, RLE, ZIPS or ZIP; #806, #874) | 70% |
| **DPX** | read + write | yes: luma / RGB / RGBA, 8–16-bit, filled 10/12-bit, either byte order (#821); packed 10/12-bit, Y'CbCr 4:2:2 / 4:4:4 with or without alpha (#841); no RLE | sequences (10-bit RGB, BT.709; #779) | 90% |
| Targa | read + write | yes: every image type, RLE, colour maps, 15–32-bit (#821) | sequences (24-bit, 32-bit with alpha; #779) | 95% |
| HEIF / HEIC | read | no | — | 0% |