avc artifacts

[macher]

Now this is not about any artifacts that i am experiencing. I want to know what kind of artifacts can be experienced while using x.264 to encode movies. which artifacts are possible and which are not ? e.g. blocking, staircase pattern, aliasing, blurring are a few to begin with.

These artifacts had existed in the older MPEG 1 and 2 standards. I would like to know and possibly discuss which of these or any other are possible for AVC ?

:thanks:

[Sharktooth]

The major artifacts you will encounter are blocking, blurring and banding.
blocking: when bitrate is not enough. it can be compensated by the inloop filter.
blurring: when the inloop filter is set too strong it blurs the image.
banding: depending on the codec (for example quicktime does a lot of banding. but other encoders doesnt show that behaviour).

[macher]

i am not familiar with the term banding, can u define it plz and thanks for the reply

[Sharktooth]

http://www.thomsongrassvalley.com/wp/Bruns/D-Cinema_Compression/img/fig12.jpg
(a) shows vertical banding.
(b) is perfectly smoothed.

[macher]

thanks a lot, how about artifacts due to interlacing and is this banding because of the DCT?

[Sirber]

good posts sharktooth! :D
very informative