### Issue type Enhancement ### Description [CMTIME_IS_VALID](https://developer.apple.com/documentation/coremedia/cmtime_is_valid?language=objc) only checks if a `CMTime`is valid. We may use [CMTIME_IS_NUMERIC](https://developer.apple.com/documentation/coremedia/cmtime_is_numeric?language=occ) and evaluate impact in SRG libraries / applications. ### Environment information * Library version: 2.5.4 * iOS version: Any * Device: Any