slackbuilds/multimedia/cfourcc/README

Identifies the codec used in AVI files (*.avi) and allow the user to
change the FourCC description code (like fourcc-changer in Windows).
Useful for people working with Microsoft AVI file. A Linux clone of
AviC fourcc changer tool.

No need to re-encode or copy the sound and video streams.

TIP: Some programs (like divx player) require the tag DIVX instead
of XVID or FMP4 or... divx or (e.t.c.) to play mpeg4 files.