1mkdir work.tmp
2
3for r in 225w_175kbps 300_215kbps 300wp_227kbps 360w_253kbps 480_624kbps 480wp_663kbps 480_959kbps 480wp_1001kbps
4do
5  for k in 1 2
6  do
7    # Encrypt bipbop_<res>.mp4 with the keys specified in this file,
8    # and output to |bipbop_<res>-cenc-{video,audio}.mp4|
9    MP4Box -crypt bipbop-cenc-audio-key${k}.xml -rem 1 -out work.tmp/bipbop_${r}-cenc-audio-key${k}.mp4 bipbop_${r}.mp4
10    MP4Box -crypt bipbop-cenc-video-key${k}.xml -rem 2 -out work.tmp/bipbop_${r}-cenc-video-key${k}.mp4 bipbop_${r}.mp4
11
12    # Fragment |bipbop_<res>-cenc-*.mp4| into 500ms segments:
13    MP4Box -dash 500 -rap -segment-name work.tmp/bipbop_${r}-cenc-audio-key${k}- -subsegs-per-sidx 5 work.tmp/bipbop_${r}-cenc-audio-key${k}.mp4
14    MP4Box -dash 500 -rap -segment-name work.tmp/bipbop_${r}-cenc-video-key${k}- -subsegs-per-sidx 5 work.tmp/bipbop_${r}-cenc-video-key${k}.mp4
15
16    # The above command will generate a set of fragments |bipbop_<res>-cenc-{video,audio}-*.m4s
17    # and |bipbop_<res>-cenc-{video,audio}-init.mp4| containing just the init segment.
18
19    # Remove unneeded mpd files.
20    rm bipbop_${r}-cenc-{audio,video}-key${k}_dash.mpd
21  done
22done
23
24# Only keep the first 4 audio & 2 video segments:
25cp work.tmp/*-init[.]mp4 ./
26cp work.tmp/*audio*-[1234][.]m4s ./
27cp work.tmp/*video*-[12][.]m4s ./
28
29rm -Rf work.tmp
30