100 Are some encoders better than others ? (MPEG-2)
Description
This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.
100 Are some encoders better than others ? (MPEG-2)
Definitely. For example, the motion estimation search range of a
has great influence over final picture quality. At a certain point a
very large range can actually become detrimental (it may encourage
large differential motion vectors). Practical ranges are usually
between +/- 15 and +/- 32. As the range doubles, for instance, the
search area quadruples. (like the classic relationship between in
increase in linear vs. area).
Rate control marks a second tell-tale area where some encoders perform
significantly better than others.
And finally, the degree of "pre-processing" (now a popular buzzword in
the business) signals that the encoder belongs to an elite marketing
class.
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