例：xxx.mpd
xml:
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 DASH-MPD.xsd" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011" minBufferTime="PT2S" type="static" mediaPresentationDuration="PT1489.85498046875S">
<Period id="0">
<AdaptationSet id="0" contentType="audio">
<Representation id="0" bandwidth="130585" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="48000">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="https://bbs.csdn.net/topics/2"/>
<BaseURL>631_audio_128k.m4s</BaseURL>
<SegmentBase indexRange="796-3815" timescale="48000">
<Initialization range="0-795"/>
</SegmentBase>
</Representation>
<Representation id="1" bandwidth="194713" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="48000">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="https://bbs.csdn.net/topics/2"/>
<BaseURL>631_audio_192k.m4s</BaseURL>
<SegmentBase indexRange="796-3815" timescale="48000">
<Initialization range="0-795"/>
</SegmentBase>
</Representation>
<Representation id="3" bandwidth="258502" codecs="mp4a.40.2" mimeType="audio/mp4" audioSamplingRate="48000">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="https://bbs.csdn.net/topics/2"/>
<BaseURL>631_audio_256k.m4s</BaseURL>
<SegmentBase indexRange="760-3779" timescale="48000">
<Initialization range="0-759"/>
</SegmentBase>
</Representation>
</AdaptationSet>
<AdaptationSet id="1" contentType="video" maxWidth="1920" maxHeight="1080" frameRate="30000/1001" par="16:9">
<Representation id="2" bandwidth="2064566" codecs="avc1.64001e" mimeType="video/mp4" sar="1:1" width="640" height="360">
<BaseURL>631_h264_360p.m4s</BaseURL>
<SegmentBase indexRange="864-3871" timescale="30000">
<Initialization range="0-863"/>
</SegmentBase>
</Representation>
<Representation id="4" bandwidth="3489541" codecs="avc1.64001e" mimeType="video/mp4" sar="32:27" width="720" height="480">
<BaseURL>631_h264_480p.m4s</BaseURL>
<SegmentBase indexRange="883-3614" timescale="30000">
<Initialization range="0-882"/>
</SegmentBase>
</Representation>
<Representation id="5" bandwidth="4756274" codecs="avc1.64001f" mimeType="video/mp4" sar="1:1" width="1280" height="720">
<BaseURL>631_h264_720p.m4s</BaseURL>
<SegmentBase indexRange="863-3582" timescale="30000">
<Initialization range="0-862"/>
</SegmentBase>
</Representation>
<Representation id="6" bandwidth="7036467" codecs="avc1.640028" mimeType="video/mp4" sar="1:1" width="1920" height="1080">
<BaseURL>631_h264_1080p.m4s</BaseURL>
<SegmentBase indexRange="864-3571" timescale="30000">
<Initialization range="0-863"/>
</SegmentBase>
</Representation>
</AdaptationSet>
</Period>
</MPD>
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