Add animated AVIF (avis) detection support#513
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davidbyttow merged 1 commit intomasterfrom Mar 6, 2026
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Fixes #509. The isAVIF function only matched the static "avif" brand in the ftyp box. Animated AVIF files use the "avis" brand, which was unrecognized, causing DetermineImageType to return unknown for valid animated AVIF images. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
avisbrand matching toisAVIF, soDetermineImageTypecorrectly returnsImageTypeAVIFfor animated AVIF filesavisbrandTest plan
Test_DetermineImageType__AVIF_Animatedpasses with syntheticavisftyp bufferTest_DetermineImageType__AVIFstill passes for static AVIF🤖 Generated with Claude Code
Note
Detect animated AVIF by updating
vips.isAVIFto accept brandaviswithftypat bytes 4–8 in foreign.goUpdate brand matching to treat
avisas AVIF alongsideavifand add a test for animated AVIF detection in foreign_test.go.📍Where to Start
Start with the
isAVIFfunction in foreign.go.Macroscope summarized 95b0cf3.