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If MPD@suggestedPresentationDelay is not present in the manifest, dashdemux selects the fragment closest to the most recently generated fragment. This causes a playback issue because this choice does not allow the DASH client to build up any buffer of downloaded fragments without pausing playback. This is because by definition new fragments appear on the server in real-time (e.g. if segment duration is 4 seconds, a new fragment will appear on the server every 4 seconds). If the starting playback position was n*segmentDuration seconds behind "now", the DASH client could download up to 'n' fragments faster than realtime before it reached the point where it needed to wait for fragments to appear on the server. The MPD@suggestedPresentationDelay attribute allows a content publisher to provide a suggested starting position that is behind the current "live" position. If the MPD@suggestedPresentationDelay attribute is not present, provide a suitable default value as a property of the dashdemux element. To allow the default presentation delay to be specified either using fragments or seconds, the property is a string that contains a number and a unit (e.g. "10 seconds", "4 fragments", "2500ms"). |
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