Problem: the Media Browser listed .dpx files and After Effects imports
DPX and Cineon scans (stills and numbered sequences), but import
refused them: nothing could decode either format, and .cin was not even
an image to the browser, so its runs never grouped into sequences.
Fix: a small pure-Rust reader written from the public SMPTE 268M and
Kodak Cineon specifications (crates/media/src/dpx.rs): luma, RGB, RGBA
and ABGR at 8/10/12/16 bits, 10-bit filled method A/B, 12-bit in 16-bit
words, both byte orders, lines padded to 32-bit words, unrotated
orientations and the pixel aspect ratio; the codec names the transfer
(log, linear, ...) and code values are shown as stored. RLE, signed,
float, Y'CbCr, packed 10/12-bit and transposed files are refused with a
clear error; every header field is bounds-checked and the data length
verified before allocating. Probe and frame decode use it first;
is_importable, the Media Browser kinds and the import dialog list
.dpx/.cin.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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