By John Watkinson
A whole, expert 'bible' on all elements of audio and video compression utilizing MPEG expertise, together with the MPEG-4 commonplace and, during this moment version, H-264. The readability of clarification and intensity of technical aspect mix to make this ebook a necessary and definitive reference paintings. THE MPEG instruction manual is either a theoretical and sensible therapy of the topic. primary wisdom is supplied along functional information on find out how to keep away from pitfalls and terrible caliber. The often-neglected problems with reconstructing the sign timebase on the decoder and of synchronizing the signs in a multiplex are taken care of totally right here. formerly titled MPEG-2, the ebook is usually revised to hide the most recent functions of the know-how. * take advantage of John Watkinson's in-depth figuring out of MPEG expertise with reasons built and confirmed in seminars offered around the world. * entire assurance of the most and newest standards--MPEG-1, MPEG-2, MPEG-4, H-264. * find out how you could observe MPEG expertise to accomplish the very best quality. * assurance of allowing applied sciences similar to interpolation, movement estimation and transforms. * a useful therapy of vital new extensions made on hand via MPEG-4, resembling item coding, mesh coding and animation. * crucial studying for these concerned with the supply of compressed audio, video, pics and interactive potential over the web and broadband networks.
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Additional info for The MPEG Handbook, Second Edition
Sample text
16 (a) In a zero-order-hold (ZOH) system, the samples are stretched to the sample period and the waveform looks like a staircase. (b) Frequency response with 100 per cent aperture nulls at multiples of sampling rate. Area of interest is up to half sampling rate. predictable, and an appropriate filter response shown in (e) can render the overall response flat once more. Note that the equalization filter in (e) is conceptually a low-pass reconstruction filter in series with an inverse sin x/x response.
Even then the mildest compression possible should be used. Whilst high compression factors are permissible for final delivery of material to the consumer, they are not advisable prior to any post-production stages. For contribution material, lower compression factors are essential and this is sometimes referred to as mezzanine level compression. One practical drawback of compression systems is that they are largely generic in structure and the same hardware can be operated at a variety of compression factors.
If the codecs are identical then each may well make, or better still be designed to make, the same decisions when they are in tandem. If the codecs are not identical the results could be disappointing. Signal manipulation between codecs can also result in artifacts which were previously undetectable becoming visible because the signal that was masking them is no longer present. In general, compression should not be used for its own sake, but only where a genuine bandwidth or cost bottleneck exists.
