Category Archives: X

XAVC

A video compression system developed by Sony and released in 2012. Designed for professional use in acquisition and post production, XAVC uses the highest level (5.2) of H.264/MPEG-4 AVC and offers some things that plain vanilla H.264 XAVC does not, such as encoding 1080/50P and 1080/60P. At the high performance end it supports 4K at both 4096 x 2160 (cinema) and 3840 x 2160 (video) resolutions at up to 60 f/s. With available bit depths of 8, 10 and 12, 4:2:0, 4:2:2 and 4:4:4 sampling and bit rates ranging from 15 to 960 Mb/s, XAVC can be used for a wide range of applications.

As H.264 is an advanced compression system, XAVC can offer high quality performance at relatively low bit rates (and smaller / longer storage) with a choice of either intra-frame or long-GOP codecs. The compressed video can be wrapped in an MXF OP1a container which is widely used in broadcast.

XAVC-S is the 8-bit consumer version of XAVC. It offers lower bits rates than XAVC and is wrapped in an MPEG-4 container. It is designed for the shorter, less complex workflows typical of consumer production.

XDCAM

Launched in 2003, Sony’s XDCAM professional camcorder products have evolved with technology. The first model was for SD television and made use of its Professional Disc (PD), an application of Blu-ray Disc, as the on-board recording medium. The product range included camcorders, mobile and studio decks which are designed to take advantage of the size, weight, data speed and re-record features of the PD technology. It used the DVCAM codec and record SD 4:1:1 (480-line) and 4:2:0 (576-line) video at 25 Mb/s onto the PD.

XDCAM HD camcorder images were native 1440 x 1080 and recorded as HDV: 1080/59.94I, 50I, 29.97P, 25P, and native 23.98P video using MPEG-2 MP@HL with compression and 4:2:0 sampling. Users could select 35 (HQ), 25 (SP), or 18 (LP) Mb/s bit rates according to picture quality and recording length requirements, ranging from 60 to 120 minutes. There were four channels of 16-bit, 48 kHz audio.

XDCAM EX takes the same ideas but records to solid-state storage in place of Blu-ray disc.

XDCAM HD422 is a family that includes a selection of cameras, recorders again including solid-state, and accessories.

See also: Professional Disc

X’Y’Z

A mathematically defined absolute color space, CIE X´Y´Z´, also known as CIE 1931 color space, was created by the International Commission on Illumination (CIE) in 1931. It was not heard much of in the digital media industry until X´Y´Z´ was selected by DCI as the color space for digital cinema.