MPEG-DASH 에서의 Trick modes

A.1  Support for trick modes

The client may pause or stop a Media Presentation. In this case client simply stops requesting Media Segments or parts thereof. To resume, the client sends requests to Media Segments, starting with the next Subsegment after the last requested Subsegment.

If a specific Representation or SubRepresentation element includes the @maxPlayoutRate attribute, then the corresponding Representation or Sub-Representation may be used for the fast-forward trick mode. The client may play the Representation or Sub-Representation with any speed up to the regular speed times the specified @maxPlayoutRate attribute with the same decoder profile and level requirements as the normal playout rate. If a specific Representation or SubRepresentation element includes the @codingDependency attribute with value set to 'false', then the corresponding Representation or Sub-Representation may be used for both fast-forward and fast-rewind trick modes.

Sub-Representations in combination with Index Segments and Subsegment Index boxes may be used for efficient trick mode implementation. Given a Sub-Representation with the desired @maxPlayoutRate, ranges corresponding to SubRepresentation@level all level values from SubRepresentation@dependencyLevel may be extracted via byte ranges constructed from the information in Subsegment Index Box. These ranges can be used to construct more compact HTTP GET request.