I am starting the process of editing videos for my choir. I am able to sync up video and audio to themselves within the same file. However, when I try and sync with other video/audio, such as accompaniment, the two videos are out of sync. My only recourse, it seems, is to stretch the audio using Audition. Once that is done and I have sync'd accompaniment with the voice, I don't know what to do. I export using Adobe Media Encoder but there is no video showing, just audio. Either I am choosing a wrong setting or...well, I don't know what else it could be. Help!
You'd be better off talking about this on the Premiere forum, I think. Syncing multiple videos to audio is a bit of a pain, but if all the recordings are made at the same time, it should be possible to sync them as long as you have a suitable cue point on each recording (I use a makeshift clapperboard). It's also pretty easy to get the settings wrong on Media Encoder - you need to check everything pretty carefully before you commit to a lengthy encode.
That's the bare bones, but for detailed help the Premiere forum sounds like a much more appropriate place to discuss this - it's rather more up their street.