【发布时间】：2021-11-27 03:11:15
【问题描述】：
我有一个从 AWS Media Convert 生成的 mpd 文件。这个 mpd 文件在 VLC 中工作，所以我知道它是一个有效文件，但它不适用于 Exoplayer 2.15.1。视频播放，但音频不存在。
这是我生成的文件：
<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:cenc="urn:mpeg:cenc:2013" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd" type="static" minBufferTime="PT30S" profiles="urn:mpeg:dash:profile:isoff-main:2011" mediaPresentationDuration="PT18M42.721S">
<Period start="PT0S" duration="PT18M42.721S" id="1">
<AdaptationSet mimeType="video/mp4" frameRate="30000/1001" segmentAlignment="true" subsegmentAlignment="true" startWithSAP="1" subsegmentStartsWithSAP="1" bitstreamSwitching="false">
<Representation id="1" width="1920" height="1080" bandwidth="8500000" codecs="avc1.640028">
<BaseURL>balance-and-strength_1080.mp4</BaseURL>
<SegmentBase indexRange="759-5286">
<Initialization range="0-758"/>
</SegmentBase>
</Representation>
<Representation id="2" width="1280" height="720" bandwidth="6500000" codecs="avc1.640028">
<BaseURL>balance-and-strength_720.mp4</BaseURL>
<SegmentBase indexRange="757-5284">
<Initialization range="0-756"/>
</SegmentBase>
</Representation>
<Representation id="3" width="960" height="540" bandwidth="3500000" codecs="avc1.640028">
<BaseURL>balance-and-strength_540.mp4</BaseURL>
<SegmentBase indexRange="757-5284">
<Initialization range="0-756"/>
</SegmentBase>
</Representation>
<Representation id="4" width="640" height="360" bandwidth="1200000" codecs="avc1.4d401f">
<BaseURL>balance-and-strength_360.mp4</BaseURL>
<SegmentBase indexRange="751-5278">
<Initialization range="0-750"/>
</SegmentBase>
</Representation>
<Representation id="5" width="640" height="360" bandwidth="600000" codecs="avc1.4d401f">
<BaseURL>balance-and-strength_360_low.mp4</BaseURL>
<SegmentBase indexRange="751-5278">
<Initialization range="0-750"/>
</SegmentBase>
</Representation>
</AdaptationSet>
<AdaptationSet mimeType="audio/mp4" lang="eng" segmentAlignment="0">
<Representation id="6" bandwidth="96000" audioSamplingRate="48000" codecs="mp4a.40.5">
<BaseURL>balance-and-strength_96kbps.mp4</BaseURL>
<SegmentBase indexRange="661-5188">
<Initialization range="0-660"/>
</SegmentBase>
</Representation>
</AdaptationSet>
<AdaptationSet mimeType="audio/mp4" lang="eng" segmentAlignment="0">
<Representation id="7" bandwidth="64000" audioSamplingRate="48000" codecs="mp4a.40.5">
<BaseURL>balance-and-strength_64kbps.mp4</BaseURL>
<SegmentBase indexRange="661-5188">
<Initialization range="0-660"/>
</SegmentBase>
</Representation>
</AdaptationSet>
</Period>
</MPD>
这是我发现在 Exoplayer 中工作的示例 mpd 文件：
<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" availabilityStartTime="1970-01-01T00:00:00Z" id="Config part of url maybe?" maxSegmentDuration="PT8S" minBufferTime="PT1S" minimumUpdatePeriod="P100Y" profiles="urn:mpeg:dash:profile:full:2011,http://www.dashif.org/guidelines/low-latency-live-v5" publishTime="2021-10-06T22:33:51Z" timeShiftBufferDepth="PT5M" type="dynamic">
<BaseURL>https://livesim.dashif.org/livesim/sts_1633559631/sid_7e7964ba/chunkdur_1/ato_7/testpic4_8s/</BaseURL>
<ServiceDescription id="0">
<Latency max="6000" min="2000" referenceId="0" target="4000" />
<PlaybackRate max="1.04" min="0.96" />
</ServiceDescription>
<Period id="p0" start="PT0S">
<AdaptationSet contentType="audio" lang="eng" segmentAlignment="true">
<ProducerReferenceTime id="0" presentationTime="0" type="encoder" wallClockTime="1970-01-01T00:00:00">
<UTCTiming schemeIdUri="urn:mpeg:dash:utc:http-iso:2014" value="http://time.akamai.com/?iso" />
</ProducerReferenceTime>
<SegmentTemplate availabilityTimeComplete="false" availabilityTimeOffset="7.000000" duration="384000" initialization="$RepresentationID$/init.mp4" media="$RepresentationID$/$Number$.m4s" startNumber="0" timescale="48000" />
<Representation audioSamplingRate="48000" bandwidth="36997" codecs="mp4a.40.2" id="A48" mimeType="audio/mp4" startWithSAP="1">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2" />
</Representation>
</AdaptationSet>
<AdaptationSet contentType="video" maxFrameRate="30" maxHeight="720" maxWidth="1280" par="16:9" segmentAlignment="true">
<ProducerReferenceTime id="0" presentationTime="0" type="encoder" wallClockTime="1970-01-01T00:00:00">
<UTCTiming schemeIdUri="urn:mpeg:dash:utc:http-iso:2014" value="http://time.akamai.com/?iso" />
</ProducerReferenceTime>
<SegmentTemplate availabilityTimeComplete="false" availabilityTimeOffset="7.000000" duration="122880" initialization="$RepresentationID$/init.mp4" media="$RepresentationID$/$Number$.m4s" startNumber="0" timescale="15360" />
<Representation bandwidth="303780" codecs="avc1.64001e" frameRate="30" height="360" id="V300" mimeType="video/mp4" sar="1:1" startWithSAP="1" width="640" />
<Representation bandwidth="603844" codecs="avc1.64001e" frameRate="30" height="360" id="V600" mimeType="video/mp4" sar="1:1" startWithSAP="1" width="640" />
<Representation bandwidth="1203833" codecs="avc1.64001f" frameRate="30" height="540" id="V1200" mimeType="video/mp4" sar="1:1" startWithSAP="1" width="960" />
<Representation bandwidth="2403767" codecs="avc1.64001f" frameRate="30" height="720" id="V2400" mimeType="video/mp4" sar="1:1" startWithSAP="1" width="1280" />
</AdaptationSet>
</Period>
<UTCTiming schemeIdUri="urn:mpeg:dash:utc:http-iso:2014" value="http://time.akamai.com/?iso" />
</MPD>
在我询问如何让 MediaConvert 以不同方式生成 mpd 之前，有没有人有这方面的经验或知道关键区别可能是什么？
【问题讨论】：
标签： android exoplayer exoplayer2.x aws-media-convert