Would make the process much less tedious. Say, something that would allow me to select key points where I map the audio track to a corresponding key point in the video track - and maybe let the program then automatically speed-up and slow-down the video segments between those key-points so that things sync. It's a slightly tedious process - and I'd like something a tad more efficient.
The current way I do the speeding-up and slowing-down is through iMovie - where I load the video, strip the audio that comes with me (which is just the sounds that are in the room at the time) load the audio that it is meant to go with - and then I split the video clip at the right places, and for each segment, adjust the speed manually, thereby getting the video to sync with the audio. Sometimes I do a presentation where I record separately the video track and the audio track - and then selectively speed-and-slow parts of the video track to sync with the audio - thereby producing something similar to whiteboard animation. My machines are a few Android tablets (not the newest, but not too old either) as well as a Mac running OS X 10.9.5 (not about to upgrade the OS - long and irrelevant story why).
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