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Erkennbare Qualitätsunterschiede zwischen mpeg-2 und mpg-4?

Discernible difference in quality between-2 and mpeg-4 mpg?



Frage von engelrot22:
Juli 2008

Hello,
can someone tell me whether there are differences in image quality between MPEG-2 and mpeg-4, or the quality is equal.
In the written Camgaroo was no visible difference was.
Thank you very much



Antwort von tommyb:

There are quite a quality difference that makes but only when used bitrate noticeable.

MPEG4 can with half the bitrate and get the same quality in comparison to MPEG2. In some cases, go even lower bitrate.

There are now a few times years of development between the codecs.



Antwort von WoWu:

@ Engelrot22

There is next, very important differences. For example, using H.264 instead of a DCT DWT transformation.
Intraprädiktionsblöcke to 4x4 pixel size.
Additional types of coding types.
H.264 uses more reference pictures as MPEG2 (up to 15). MPEG2 only 1st
There are more Prädiktionsmodie (local, temporal, vectors) so that predictions are much more accurate. (Up to 1 / 4 pixel)
Considerably more accurate motion vectors, synonymous for all images.
A whole bunch of filters for image enhancement is synonymous for Choice uA of filter to reduce block artifacts.
There are also opportunities within the codec crossfades, brightness or color adjustments made.
These are the main changes.
So you see, it's been a lot done, which is directly in the image effect, but of course synonymous in bitrate efficiency, because it is not just more compressed!
There are better methods, which allow, at the same picture quality with a lower bitrate ends meet.
In other words: Will you with the same bitrate on your video, as in HDV (MPEG2), you have a much better picture.









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