Atom moov/mvex/mehd is not removed from init.mp4 file

[Murmur]

Init mp4 file has moov/mvex/mehd atom indicating the total duration of vod file. This atom is not necessary in a live dash feed. My limited testing indicates it's not a problem but probably atom should still be dropped.

• Content packager could create a batch process to modify files before copying to the dashlivesim/vod folder.
• Add vod-analyzer livesim command-line attribute to tell modify an init segment while writing .cfg file.
• Modify init segment at runtime before returning to http client.

[TobbeEdgeware]

I think we should go for the third option. It needs two scans, though, since one must first see if there is an mehd box and then remove and change the size of the mvex and moon boxes. Will you make a PR?