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"Coded Frame Duration The duration of a coded frame. For video and text, the duration indicates how long the video frame or text should be displayed. For audio, the duration represents the sum of all the samples contained within the coded frame. For example, if an audio frame contained 441 samples @44100Hz the frame duration would be 100 milliseconds." 441 samples @ 44100 Hz makes a duration of 10ms not 100ms.
Changes committed https://dvcs.w3.org/hg/html-media/rev/d471a4412040