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The timestampOffset attribute setter, appendArrayBuffer(), and appendStream() algorithms first check if the 'object has been removed from the sourceBuffers attribute of the parent media source' and then checks if the 'parent media source is in the "closed" state'. This second check will never trigger because on the transition to the "closed" state all SourceBuffer objects are removed from sourceBuffers. This second check should be removed.
Changes committed. https://dvcs.w3.org/hg/html-media/rev/dcd406812201