Some more errors here, just so we can start compiling a list of what is unsupported:

An unsupported SWF tag was encountered. (1 occurrences)

The global ActionScript property _quality is not supported. (1 occurrences)

Character glyphs aligned on pixel boundaries are not supported. (4 occurrences)

The #initclip pragma is not supported. (23 occurrences)

An unsupported audio codec was encountered. (1 occurrences)