what's difference about mpeg2 v.s h.264?

[mitsubishi]

Hi anybody,

I want to design the chip of h.264. so i study document now.
Could anybody can point out what's difference feature in mpeg2 and h.264. On the other hand what's feature of simple profile and main profile. THX.

Best regards.

 

[andromeda]

There are numerous improvement in H.264 (against MPEG-4 baseline)related to both coding efficiency and robustness to data errors, like:
- variable block-size motion compensation
- 1/4-sample-accurate motion compensation
- multiple reference pictures motion compensation
- weighted prediction
- moving of intra prediction in space domain, with 13/17 different modes
- in-the-loop deblocking filtering
- 4x4 integer DCT aproximation transform instead 8x8 DCT
- hierachical block transform
- exact-match inverse transform
- simplified quantization (no division but standardised division approximation with multipling and shifting)
- context-adaptive entropy coding (CAVLC, CABAC)
- parameter set and NAL unit structure
- flexible slice size
- flexible macroblock ordering and arbitrary slice ordering
- redudant pictures
- data partitioning
- SP/SI synchronization/switching pictures
- field coding

There are 3 profiles for now (profiles with more then 8-bit per pixels are expected):
1. baseline (doesn't support: B slices, weighted prediction, CABAC, field coding, SP/SI slices, slice data partitioning) - intended for conversational and streaming services
2. extended (doesn't support: CABAC) - intended for conversational and streaming services
3. main (doesn't support: flexible MB ordering, arbitrary slice ordering, redudant pictures) - intended for entertainment video applications (broadcast, DVD, video on demand)

 

[king002]

Message is unavailable.

 

[lijian_18]

H.264 is more like MPEG4 rather than MPEG2.

 

[gaonkc]

h.264 is part 10 of MPEG4.
h264 MB : 4x4, 8x8 ,8x4, 4x8 etc.
DCT: integer
compress rate is better than MPEG2