mp4: fix integer underflow
Reported-by: Hyeon-Ju Lee <zorurione@gmail.com>
(cherry picked from commit
b2b157076d9e94df34502dd8df0787deb940e938)
Gbp-Pq: Name 0003-mp4-fix-integer-underflow.patch
codec: subsvtt: unbreak rendering (fix #22425)
5ef3830f385bfa6a47e9088f9a0d13062cd61c3a regression
(cherry picked from commit
749b7b3729a5892d1a07036ef0974c17ddbe9e2e)
Gbp-Pq: Name 0002-codec-subsvtt-unbreak-rendering-fix-22425.patch