title: Combine MPEG-DASH segments (ex, init.mp4 + segments.m4s) back to a full source.mp4?
body: <p>GPAC, <a href="http://gpac.wp.mines-telecom.fr/" rel="noreferrer">http://gpac.wp.mines-telecom.fr/</a>, can be used to do video segmentation along with MPEG-DASH spec. One type of results is a combination of init files (ex, init.mp4) and several roughly fixed-duration segments (ex, segment-%d.m4s). What if I just got those results and I like to reverse/combine them back to one full source.mp4 file? Can I use GPAC or ffmpeg for this?</p>