muxer: Add --movie-timescale option.
muxer: Add --movie-timescale option.

maki-rxrz/L-SMASH,silverfilain/L-SMASH,l-smash/l-smash,silverfilain/L-SMASH,silverfilain/L-SMASH,l-smash/l-smash,l-smash/l-smash,maki-rxrz/L-SMASH