具有安全S3網址的MPEG-Dash

我正在嘗試使用MPEG-Dash設置視頻服務器，其中的視頻內容託管在S3存儲桶中。在本地託管（nginx服務器）時，它工作正常，但當我將MPD文件更改爲指向S3存儲桶時，它不起作用。具有安全S3網址的MPEG-Dash

下面是我在做什麼：

- 第一個我的視頻轉換成多比特率MP4

/usr/bin/ffmpeg -y -async 1 -vsync -1 -analyzeduration 999999999 -i <SOURCE> \ 
    -movflags faststart -keyint_min 30 -x264opts "keyint=30:min-keyint=30:no-scenecut" -g 30 -filter:v "scale=iw*min(320/iw\,180/ih):ih*min(320/iw\,180/ih), pad=320:180:(320-iw*min(320/iw\,180/ih))/2:(180-ih*min(320/iw\,180/ih))/2" -r:v 30 -s 320x180 -b:v 320k -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 3.0 -an "'.$base.'180p.mp4" \ 
    -movflags faststart -keyint_min 30 -x264opts "keyint=30:min-keyint=30:no-scenecut" -g 30 -filter:v "scale=iw*min(640/iw\,360/ih):ih*min(640/iw\,360/ih), pad=640:360:(640-iw*min(640/iw\,360/ih))/2:(360-ih*min(640/iw\,360/ih))/2" -r:v 30 -s 640x360 -b:v 640k -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 3.0 -an "'.$base.'360p.mp4" \ 
    -movflags faststart -keyint_min 30 -x264opts "keyint=30:min-keyint=30:no-scenecut" -g 30 -filter:v "scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih), pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2" -r:v 30 -s 1280x720 -b:v 1280k -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 3.1 -an "'.$base.'720p.mp4" \ 
    -c:v copy -c:a libfdk_aac -ac 2 -ar 48000 -b:a 96k "'.$base.'aacp.mp4"

--Then我MP4Box

/usr/bin/MP4Box -dash 10000 -rap -profile dashavc264:onDemand -out "stream.mpd" \ 
    180p.mp4#video \ 
    360p.mp4#video \ 
    720p.mp4#video \ 
    aacp.mp4#audio

衝吧 - - 導致以下MPD

<?xml version="1.0"?> 
<!-- MPD file Generated with GPAC version 0.5.1-DEV-rev4065 on 2015-08-08T02:18:28Z--> 
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" minBufferTime="PT1.500000S" type="static" mediaPresentationDuration="PT0H1M56.11S" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011, http://dashif.org/guildelines/dash264"> 
<ProgramInformation moreInformationURL="http://gpac.sourceforge.net"> 
    <Title>/webdata/temp/10/dash/10.mpd generated by GPAC</Title> 
</ProgramInformation> 

<Period duration="PT0H1M56.11S"> 
    <AdaptationSet segmentAlignment="true" maxWidth="1280" maxHeight="720" maxFrameRate="30" par="16:9" lang="und"> 
    <Representation id="1" mimeType="video/mp4" codecs="avc1.42c01e" width="320" height="180" frameRate="30" sar="1:1" startWithSAP="1" bandwidth="349890"> 
    <BaseURL>180p_track1_dashinit.mp4</BaseURL> 
    <SegmentBase indexRangeExact="true" indexRange="900-1075"> 
     <Initialization range="0-899"/> 
    </SegmentBase> 
    </Representation> 
    <Representation id="2" mimeType="video/mp4" codecs="avc1.42c01e" width="640" height="360" frameRate="30" sar="1:1" startWithSAP="1" bandwidth="701122"> 
    <BaseURL>360p_track1_dashinit.mp4</BaseURL> 
    <SegmentBase indexRangeExact="true" indexRange="900-1075"> 
     <Initialization range="0-899"/> 
    </SegmentBase> 
    </Representation> 
    <Representation id="3" mimeType="video/mp4" codecs="avc1.42c01f" width="1280" height="720" frameRate="30" sar="1:1" startWithSAP="1" bandwidth="1401368"> 
    <BaseURL>720p_track1_dashinit.mp4</BaseURL> 
    <SegmentBase indexRangeExact="true" indexRange="900-1075"> 
     <Initialization range="0-899"/> 
    </SegmentBase> 
    </Representation> 
    </AdaptationSet> 
    <AdaptationSet segmentAlignment="true" lang="und"> 
    <Representation id="4" mimeType="audio/mp4" codecs="mp4a.40.2" audioSamplingRate="48000" startWithSAP="1" bandwidth="97736"> 
    <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/> 
    <BaseURL>aacp_track2_dashinit.mp4</BaseURL> 
    <SegmentBase indexRangeExact="true" indexRange="837-1012"> 
     <Initialization range="0-836"/> 
    </SegmentBase> 
    </Representation> 
    </AdaptationSet> 
</Period> 
</MPD>

當我編輯MPD有動態網址：

--PHP源 -

<?php 
    $temp = S3URL("<VIDEOBUCKET>","10/dash/180p_track1_dashinit.mp4","653"); 
    echo "<BaseURL>".str_replace("https://<VIDEOBUCKET>.s3.amazonaws.com/10/dash/","",$temp)."</BaseURL>".PHP_EOL; 
?>

--ECHOED數據 -

<BaseURL>180p_track1_dashinit.mp4?AWSAccessKeyId=XXXXXXXXXX&Expires=XXXXXXXXXX&Signature=XXXXXXXXXX</BaseURL>

我得到MPD文件無效內容。我環顧四周，嘗試將BaseURL移動到XML的適應，表示和其他節，但似乎沒有任何工作。

這樣做的正確方法是什麼？

來源

2015-08-08 hdezela

你使用哪個玩家，bitdash，dash.js，shaka等？ –

@ChristopherMueller，我嘗試了所有......我認爲這與BaseUrl的放置位置有關，但Dash文件太神祕了，我無法弄清楚。 – hdezela

我遇到了同樣的問題。我遇到的問題是S3 Presigned URL包含需要爲XML轉義的字符。否則，你最終會得到無效的XML。

我使用的是C＃，所以我不得不使用HttpUtility.HtmlEncode()方法來確保我的安全鏈接不會使XML無效。

來源

2016-09-10 21:10:09

具有安全S3網址的MPEG-Dash

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