isomp4/qtmux: allow resolution changes for H264 / H265
Follow up on cb75eda1, H264 / H265 resolution changes are advertised through SPS / PPS, it is thus legal for them to change in the caps.
Follow up on cb75eda1, H264 / H265 resolution changes are advertised through SPS / PPS, it is thus legal for them to change in the caps.