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@Paul_Kinlan @anssik Yeah, I think I stumbled over this, too, when I wrote web.dev/mediastreamtrack-insertable-media-processing/#bringing-it-all-together, but it got clearer when I understood what it does: w3c.github.io/webcodecs/#dom-videoframe-close. In contrast, when a frame is written to
writable
, the frame'sclose()
method is automatically invoked.