如果MPD文件没有任何段URL列表,如何确定DASH介质的段数？它只有一个段模板,因此我不知道与该MPD关联的媒体有多少段.这是我正在谈论的MPD:
<MPD type="static" xmlns="urn:mpeg:DASH:schema:MPD:2011" profiles="urn:mpeg:dash:profile:full:2011" minBufferTime="PT1.5S" mediaPresentationDuration="PT0H1M59.89S">
<ProgramInformation moreInformationURL="http://gpac.sourceforge.net">
<Title>Media Presentation Description for file hdworld_0696kbps_ffmpeg_track1.mp4 generated with GPAC </Title>
</ProgramInformation>
<Period start="PT0S" duration="PT0H1M59.89S">
<AdaptationSet>
<ContentComponent id="1" contentType="video"/>
<SegmentTemplate initialization="/$Bandwidth$/hdworld_ffmpeg_track1_dash.mp4" timescale="1000" duration="4920" media="/$Bandwidth$/hdworld_ffmpeg_track1_$Number$.m4s" startNumber="1"/>
<Representation id="1" mimeType="video/mp4" codecs="avc1.64001f" width="1280" height="720" startWithSAP="1" bandwidth="534343"/>
<Representation id="2" mimeType="video/mp4" codecs="avc1.64001f" width="1280" height="720" startWithSAP="1" bandwidth="812553"/>
<Representation id="3" mimeType="video/mp4" codecs="avc1.64001f" width="1280" height="720" startWithSAP="1" bandwidth="1607692"/>
</AdaptationSet>
<AdaptationSet>
<ContentComponent id="2" contentType="audio" lang="und"/>
<SegmentTemplate initialization="/audio/HDWorld_audio_init.mp4"/>
<Representation id="6" mimeType="audio/mp4" codecs="mp4a.40.02" sampleRate="44100" numChannels="2" lang="und" startWithSAP="1" bandwidth="257141">
<SegmentTemplate timescale="1000" duration="9980" media="/audio/hdworld_seg_audio$Number$.m4s" startNumber="1"/>
</Representation> …