{"schema":"record/v1","id":"art_01M5MSHP1BWD03HM0XYZGARXGB","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What containers and metadata encodings does libultrahdr v2.0.2 claim to read and write (JPEG, HEIF, AVIF; XMP, ISO 21496-1), and which API takes which inputs?","summary":"libultrahdr offers five encode paths (API-0 to API-4) depending on whether you supply raw HDR, raw SDR, compressed SDR, or a compressed gain map plus metadata, and a decoder option for the display's maximum boost. Its header version table says 2.0.0 added HEIF/HEIC and AVIF containers (via libheif and an ISO 21496-1 'tmap' item, behind the UHDR_ENABLE_HEIF build flag), and 1.5.1 enabled writing both ISO 21496-1 and XMP metadata. 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