H.264 importer: Drop access unit delimiters.
H.264 importer: Drop access unit delimiters.

l-smash/l-smash,silverfilain/L-SMASH,maki-rxrz/L-SMASH,l-smash/l-smash,silverfilain/L-SMASH,l-smash/l-smash,maki-rxrz/L-SMASH,dwbuiten/l-smash,dwbuiten/l-smash,canbal/l-smash,canbal/l-smash,mstorsjo/l-smash,silverfilain/L-SMASH,mstorsjo/l-smash