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diff --git a/dom/media/test/bipbop-frag-cenc.xml b/dom/media/test/bipbop-frag-cenc.xml
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+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+ This XML file describes the encryption applied to |bipbop-cenc*|. To
+ generate the bipbop-cenc files, run the following commands:
+
+ Encrypt bipbop-no-edts.mp4 with the keys specified in this file,
+ and output to |bipbop-cenc-{video,audio}.mp4|
+ MP4Box -crypt bipbop-frag-cenc.xml -rem 2 -out bipbop-cenc-video.mp4 bipbop-no-edts.mp4
+ MP4Box -crypt bipbop-frag-cenc.xml -rem 1 -out bipbop-cenc-audio.mp4 bipbop-no-edts.mp4
+
+ Fragment |bipbop-cenc-*.mp4| into 500ms segments:
+ MP4Box -dash 500 -rap -segment-name bipbop-cenc-video -subsegs-per-sidx 5 bipbop-cenc-video.mp4
+ MP4Box -dash 500 -rap -segment-name bipbop-cenc-audio -subsegs-per-sidx 5 bipbop-cenc-audio.mp4
+
+ The above command will generate a set of fragments in |bipbop-cenc-{video,audio}*.m4s
+ and |bipbop-cenc-{video,audio}init.mp4| containing just the init segment.
+
+ To cut down the duration, we throw out all but the first 3 audio & 2 video segments:
+ rm bipbop-cenc-audio{[^123],[123][^.]}.m4s
+ rm bipbop-cenc-video{[^12],[12][^.]}.m4s
+
+ MP4Box will also have generated some *.mpd files we don't need:
+ rm bipbop-cenc-*.mpd
+
+ Delete intermediate encrypted files:
+ rm bipbop-cenc-{audio,video}.mp4
+-->
+
+<GPACDRM type="CENC AES-CTR">
+
+ <DRMInfo type="pssh" version="1">
+ <!--
+ SystemID specified in
+ https://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/cenc-format.html
+ -->
+ <BS ID128="1077efecc0b24d02ace33c1e52e2fb4b" />
+ <!-- Number of KeyIDs = 2 -->
+ <BS bits="32" value="2" />
+ <!-- KeyID -->
+ <BS ID128="0x7e571d037e571d037e571d037e571d03" />
+ <BS ID128="0x7e571d047e571d047e571d047e571d04" />
+ </DRMInfo>
+
+ <CrypTrack trackID="1" isEncrypted="1" IV_size="16" saiSavedBox="senc"
+ first_IV="0x00000000000000000000000000000000">
+ <key KID="0x7e571d037e571d037e571d037e571d03"
+ value="0x7e5733337e5733337e5733337e573333" />
+ </CrypTrack>
+
+ <CrypTrack trackID="2" isEncrypted="1" IV_size="16" saiSavedBox="senc"
+ first_IV="0x00000000000000000000000000000000">
+ <key KID="0x7e571d047e571d047e571d047e571d04"
+ value="0x7e5744447e5744447e5744447e574444" />
+ </CrypTrack>
+
+</GPACDRM>