We are sorry to hear about this issue. However, we found if you use the trimmed video function before you send to your friends in Wha’s App, What’s App would be crashed when re-converting and sending the trimmed video. We think it should be the bug issue of What’s App instead of MiniMovie’s since we also tried other kind of MP4 video and used the trim function in What’s App, What’s App still got crashed problem. We suggest you either contact What’s App support to ask them fix the issue or you can also upload your video on Youtube and share the URL to your What’sApp friends. Thank you and kindly let us know if you got issue resolved from What’s App. Hope we can hear from you soon.