How Video Works: From Broadcast to the Cloud by Diana Weynand & Vance Piccin

Author:Diana Weynand & Vance Piccin [Weynand, Diana]
Language: eng
Format: azw3
ISBN: 9781317661801
Publisher: Taylor and Francis
Published: 2015-08-14T04:00:00+00:00

Main Profile at Main Level

The different profiles and levels can be mixed and matched to create a wide variety of picture sizes, bit rates, and encoding qualities. The most useful combination for Standard Definition images is the Main Profile at Main Level (abbreviated as MP@ML). Main Profile means that I, B, and P frames can be used for compression, and Main Level means that the picture resolution is 720 × 480 in NTSC. Different storage, delivery and transmission systems have different bit rate constraints. The I, B, P compression tools are flexible enough that MP@ML can adjust the bit rates. Lowering the bit rate reduces the picture quality unless it is compensated for by using more sophisticated encoding tools.

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