The range is a critical concept in digital video encoding, specifically for formats like MP4 (AVC/H.264) . It refers to "Limited Range" or "Broadcast Range" video, where the luminance (brightness) levels are squeezed into a specific 8-bit bucket to ensure compatibility with traditional television standards. The Technical Divide: 0-255 vs. 16-235
Typically used by PCs and digital cameras for internal processing. It uses the entire spectrum, where 0 is absolute black and 255 is absolute white.
Most video (the codec usually inside an MP4 file) defaults to limited range for archival and YouTube distribution. This standard originated from analog television, where "footroom" (0-15) and "headroom" (236-255) were reserved to prevent signal interference or "clipping" at extreme ends of the spectrum.
