Understanding and repairing sync

…Because you are so easily able to trim, splice, extract, and…move the separate video and audio elements in Media Composer,…you can get out of sync fairly easily if you're not careful.…For many beginning editors, this can be frustrating.…But the more you practice and the more you're aware of how Media Composer…inherently works, the more you will hopefully appreciate the flexibility of…being able to independently and easily work with both video and…audio, something that a lot of other editing programs make more difficult for…the sake of keeping everything in sync.…All right, so with all of that said, I just want to kind of run down some of…the main ways that you may find yourself out of sync.…

First of all, zoom in here.…If you trim just video or…just audio with single-roller trim, you're going to get out of sync.…So, I'll get into Trim mode here,…U, and I'll select my A-side here and let's just trim to the right.…Okay.…You can see that I've added frames to my video but…not my audio, which caused everything downstream to get out of sync.…