Source: A residential building construction guide and technical specification document.
Could you clarify a few details so I can give you more specific help? Gracel Set 40.MPGl
Want to test it? Download a sample 40.MPGl sidecar log from the Gracel open specification repository, or encode your first clip using the FFmpeg command above — then inspect the .MPGl metadata. You’ll never look at video files the same way again. Source : A residential building construction guide and
Step 3: Attempt conversion
If VLC plays it but other players don’t, use FFmpeg: Gracel Set 40.MPGl