Handle non-compliant files

[Asd-g]

Blackmagic Design DaVinci Resolve Studio can write mp4 file with ctts version 1 but mark it as ctts version 0.

Always interpreting the sample_offset as signed is safe even if we have ctts version 0. We need offset >= 6.6 hours (a frame, after being decoded, should wait 6.6 hours before being displayed) for getting overflow.

[dwbuiten]

I am not really a fan of parsing files in non-compliant ways... it kind of goes against the ethos of L-SMASH, doesn't it?

CC: @VFR-maniac

[VFR-maniac]

L-SMASH never yields to and never allows non-compliant files. Use ffmpeg.

[Asd-g]

Then I guess this should be closed.