我正在遵循这个demo,它使用mediaSource API和 MPEG DASH 标准来播放.webm视频。
这是使用的MPD文件:
<?xml version="1.0" encoding="UTF-8"?>
<MPD
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="urn:mpeg:DASH:schema:MPD:2011"
xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011"
type="static"
mediaPresentationDuration="PT888.05S"
minBufferTime="PT1S"
profiles="urn:webm:dash:profile:webm-on-demand:2012">
<Period id="0" start="PT0S" duration="PT888.05S" >
<AdaptationSet id="0" mimeType="video/webm" codecs="vp8" lang="eng" width="720" height="306" subsegmentAlignment="true" subsegmentStartsWithSAP="1" bitstreamSwitching="true">
<Representation id="1" bandwidth="534144">
<BaseURL>mevq_logo_720x306_0250k_int-150-150.webm</BaseURL>
<SegmentBase indexRange="29052226-29054708">
<Initialization range="0-229" />
</SegmentBase>
</Representation>
<Representation id="2" bandwidth="1078766">
<BaseURL>mevq_logo_720x306_0500k_int-150-150.webm</BaseURL>
<SegmentBase indexRange="56003676-56006200">
<Initialization range="0-229" />
</SegmentBase>
</Representation>
<Representation id="3" bandwidth="1745140">
<BaseURL>mevq_logo_720x306_0750k_int-150-150.webm</BaseURL>
<SegmentBase indexRange="83686040-83688577">
<Initialization range="0-229" />
</SegmentBase>
</Representation>
<Representation id="4" bandwidth="2295403">
<BaseURL>mevq_logo_720x306_1000k_int-150-150.webm</BaseURL>
<SegmentBase indexRange="111588024-111590567">
<Initialization range="0-229" />
</SegmentBase>
</Representation>
<Representation id="5" bandwidth="3797938">
<BaseURL>mevq_logo_720x306_1500k_int-150-150.webm</BaseURL>
<SegmentBase indexRange="166960740-166963291">
<Initialization range="0-229" />
</SegmentBase>
</Representation>
<Representation id="6" bandwidth="6418657">
<BaseURL>mevq_logo_720x306_2000k_int-150-150.webm</BaseURL>
<SegmentBase indexRange="222165200-222167753">
<Initialization range="0-229" />
</SegmentBase>
</Representation>
</AdaptationSet>
<AdaptationSet id="1" mimeType="audio/webm" codecs="vorbis" lang="eng" audioSamplingRate="41000" subsegmentStartsWithSAP="1">
<Representation id="7" bandwidth="115479">
<BaseURL>evq_vorbis_128kbps_cues-5sec_tracks-2.webm</BaseURL>
<SegmentBase indexRange="11944509-11947524">
<Initialization range="0-4501" />
</SegmentBase>
</Representation>
</AdaptationSet>
有人知道如何获取/计算任何视频的数字“SegmentBase indexRange”和“初始化范围”吗?
最佳答案
indexRange包含分割索引框(sidx)。
它基本上是元数据片段,其中包含有关播放器在下载文件时应请求的片段的信息。
这是来自规范的报价:
sidx框在HERE中进行了描述
可以找到HERE和HERE(from dash.js project)解析器
初始化-根据规范:
希望能有所帮助!
关于xml - 如何创建MPEG-DASH的MPD文件来播放WebM视频?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/14751134/