"Its an MP4 video clip rendered in Vegas using Magix/AAC one. Any ideas?"
Render the clip from the original Vegas project to a more editable form. Why HEVC? For media that will be reused, pick Apple ProRes or MagicYUV or anything else that doesn't lose quality and cause future problems in projects.
Don't mean to beat this dead horse but HEVC is a render option, I just found out that file was my file, no idea why it was HEVC, I only set Vegas To Magix AVC/AAC MP4.
HEVC is primarily a 'final' delivery option. Poor choice if you plan to do further work on file. The file suffix being mp4 does not distinguish between 'avc' & hevc. Most tv's will not play 'hevc.mp4'.
HEVC is primarily a 'final' delivery option. Poor choice if you plan to do further work on file. The file suffix being mp4 does not distinguish between 'avc' & hevc. Most tv's will not play 'hevc.mp4'.