# HEVC Range Extensions conformance fixtures

These fixtures come from the electronic attachment to [ITU-T H.265.1 (10/2018)](https://www.itu.int/rec/T-REC-H.265.1-201810-I/en), the conformance specification aligned with ISO/IEC 23008-8. Table 4 identifies the Sony `GENERAL_*_RExt` streams and their required profiles.

The `.bit` files are the original Annex B conformance streams. Each `_frame0.yuv` file contains the first decoded picture extracted byte-for-byte from the corresponding published planar reference output; it was not generated by ImageSharp.

`HevcPictureDecoderTests.DecodeOfficialRangeExtensionsPictureMatchesPublishedDigest` limits each stream to its first independently coded picture, adapts that picture to the bounded `hvc1` item contract, compares every reconstructed sample with `_frame0.yuv`, and verifies the published decoded-picture MD5 value for every present plane.

The retained matrix covers the ImageSharp 8, 10, and 12-bit still-image precision boundary across monochrome, 4:2:0, 4:2:2, and 4:4:4. Tool-specific H.265.1 streams remain necessary before every exposed Range Extensions tool can be marked complete.