Steps to reproduce:
1. Run a workflow that creates a new track via encoding or muxing
2. The size is unset in the track element
This showed up in the RSS feeds as there was no size information and the dcDuration was being used as a ballpark figure see
Though the ComposerService gets the tracks it produces inspected it doesn't get them enriched which is when the filesize is set. It is possible therefore that other information is not being set either.