eff30e3d1b
and reduce rounding errors in calculating the sample duration - Default time scale for tracks other than audio is set to 90000. - Audio track by default uses the audio sampling rate as the time scale. - Default movie time scale remains to be 1000. - The default time scale values will be overwritten by a user-supplied value if exits. Change-Id: I81b40ed0626ea45e9fd24a89e21a2c5a4a2c3415