Sparkles3216
If your videos worked with Premiere Elements 10, then they should work with Premiere Elements 12.
From what I have read in this thread, your source seems to be files in amv video format (proprietary) which seem to have relations to MotionJPEG video compression and .avi file extension. Challenging, but. What is the actual file extension of your amv files?
If you can post a sample of one of these videos that are going into your Premiere Elements 12 project and losing sound in the export from Premiere Elements 12, I would be glad for the opportunity to check it out for you in various versions of Premiere Elements, including 10 and 12. You might send the sample in a Dropbox link posted in your thread reply.
My only requirement is the assurance that you have permission to work with these videos. YouTube license does not allow for downloads of its videos. A person can create a YouTube account, sign into YouTube, can upload a video, and later download his or her own, but not the video of others without permission.
I still do not see the support for the file in Premiere Elements (any version). But if you say that the file worked in Premiere Elements 10, as I said, it should work in Premiere Elements 12.
More later.
Thanks.
ATR