When I import MP4 files into Vegas Pro 20 the audio is glitchy/garbled in spots. These same MP4 files play perfectly fine when opened or imported elsewhere (Media Player, DaVinci Resolve, Pro Tools, etc.) - so it's not a sound card issue.
I went back and tested my old copy of Movie Studio (v9) - which is 32-bit - and the same MP4 file loads and plays PERFECTLY.
I then tested other versions of Vegas Pro (v12) and Movie Studio (v10 and v13) and found that this problem seems to occur in all 64-bit versions of Vegas Pro and Movie Studio. The audio on the RIGHT channel of MP4 imports experience glitching, both during live playback and renders. Audio on the LEFT channel is fine. Project audio sample rates and bit depth settings have no effect on the glitching.
I converted the MP4 file to a .mov file (with a PCM audio stream) using ffmpeg and that file opened and played PERFECTLY in Vegas 20 and 14.
So, it seems there may be a problem with the Magix 64-bit MP4 audio decoder (qt7plug.dll ?). Again, these same MP4 files play perfectly everywhere else, but not when imported to any 64-bit version of Vegas (on my system).
Anyone else come across this problem? Solution?
(Windows 10 Home version)