Attached is a patch that allows MLT to display current playlist timecode on
Basically, it slightly tweaks the data_show filter so that if the filter sees
the text "#tc#", it replaces it with current timecode.
To see a demo, apply patch then edit the mlt_attributes file in mlt/demo and
You will then see timecode overlayed.
This feature is quite nice in my opinion, is it ok to commit ?