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bflatasticandClaude Opus 5.5
c1e13b1f66
apply_output checked `channels: rgba` against the module before it applied `webmCodec`, and choosing AV1 then quietly dropped the channels to RGB. So `render --format webm --webm-codec av1 --channels rgba` (one renderQueue.add) succeeded and wrote an opaque AV1 stream. The codec options now apply before Channels, so the existing "has no alpha channel" error (how an unsupported channels request is already reported) refuses the combination; for WebM it names the codec: "AV1 WebM has no alpha channel (VP9 WebM has)". Choosing AV1 alone on an RGBA VP9 item still switches it to RGB, as changing the format does. Test: av1_webm_refuses_requested_alpha. Co-Authored-By: Claude Opus 5.5 <[email protected]>