我下面有this清单文件。问题是播放器在开始播放之前会等待流完全下载，这对用户体验不利。知道如何解决吗？我希望播放器启动范围请求，并向媒体源提供部分请求，而不是等待流完全下载。
<MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediaPresentationDuration="PT30M67.6S" minBufferTime="PT2S">
<ProgramInformation></ProgramInformation>
<Period id="0" start="PT0.0S">
<AdaptationSet id="0" contentType="video" segmentAlignment="true" bitstreamSwitching="true" lang="und">
<Representation id="0" mimeType="video/webm" codecs="vp9" bandwidth="770153" width="854" height="480" frameRate="23421/1000">
<BaseURL>https://liveradio.s3.eu-central-1.amazonaws.com/video.webm</BaseURL>
<SegmentList duration="1840613" startNumber="1">
<Initialization range="0-219"/>
<SegmentURL indexRange="220-6592"/>
</SegmentList>
</Representation>
</AdaptationSet>
<AdaptationSet id="1" contentType="audio" segmentAlignment="true" bitstreamSwitching="true" lang="und">
<Representation id="1" mimeType="audio/webm" codecs="opus" bandwidth="115412" audioSamplingRate="48000">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
<BaseURL>https://liveradio.s3.eu-central-1.amazonaws.com/audio.webm</BaseURL>
<SegmentList duration="1840641" startNumber="1">
<Initialization range="0-258"/>
<SegmentURL indexRange="259-3444"/>
</SegmentList>
</Representation>
</AdaptationSet>
</Period>
</MPD>