This is a source label . It refers to a movie recorded in a cinema using a high-quality camera (HD) on a tripod, with the audio often synced directly from a professional source (like a headphone jack for the hearing impaired) to avoid background noise. Key Differences 1. Technology vs. Source
If you intended to compare HEVC vs. (modern royalty-free codec) or H.266 VVC (future standard), here is a quick summary: hevc vs hdtc