High-resolution high-definition
HRHD (High Resolution High-Definition) (also HR, HRHDTV, or HR.HDTV) is an initialisation, often seen as part of the filename of TV shows shared on the Internet.
It refers to a standard of encoding video, meaning that the video signal was ripped directly from a HDTV broadcast[1], then down-sampled to approximately 960x540, and usually encoded with Xvid. While the horizontal resolution of 960 remains constant the vertical resolution can fluctuate up to 5% to provide clean cropping.
A HRHD encoding for a 40-55 minute TV show should be approximately 700MB. It contains the original AC3 sound, which is often 5.1 channels[1], instead of the re-encoded MP3 stream found in 350MB releases.
History
The HRHD format began in late 2003 when the TV capture group FUA began distributing what they termed HRHDTV rips on the private FTP sites of The Scene. The group defined what HRHDTV is in their NFO, a small text file included with releases to give information specific to the release[1].
Recently, there has been a misconception about the name. Some mistakenly think the term means Half Resolution High Definition. This version of the term incorrect not only because of the history, but also factually. While Half Resolution fits if the source is 1080i, it fails if the source is 720p.
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