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JamesandClaude Opus 4.7
b836941f09
Newer libavformat builds write the VP9-alpha sidecar tag as 'ALPHA_MODE' (uppercase); older builds write 'alpha_mode'. ffprobe.ts only checked the lowercase form, so files produced by recent ffmpeg encoders (including the output of 'hyperframes remove-background' itself) were misclassified as having no alpha channel. Knock-on effect: the producer extracted them as JPGs (no alpha), the injected <img> overlays were fully opaque rectangles, and any element below them on the z-stack (text, captions, other layers) silently disappeared from the rendered output — even though the studio preview rendered the same composition correctly via native <video> playback. Symptom in our repro: a text-behind-subject composition showed the headline correctly in studio preview but the production render covered the headline entirely with the opaque avatar image. Fix: read videoStream.tags.alpha_mode OR videoStream.tags.ALPHA_MODE. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>