Comments on open issues for MPEG-4 AVC supplement

2009/04/22

JAHIS, Karl Storz

2009/04/22 - 2

Outline

Comments on open issues Re-encoding Aspect ratio Audio format Media profile

2009/04/22 - 3

Re-encoding

We do not use re-encoding in most cases. Re-encoding issue should be taken care in the

system design and we do not have to take care in the MPEG-4 AVC / H.264 supplement.

2009/04/22 - 4

Aspect Ratio

We should standardize formats supported by the current hardware encoders/decoders in the first version of the supplement. Image size: 1920x1080, 1280x720 Chroma sampling: 4:2:0 Bit depth: 8 bits

2009/04/22 - 5

Audio Format

AC3 as a new format of audio codec should be defined in the MPEG-4 AVC supplement as accompanying audio with MPEG-4 AVC video. Note: MP3 format is defined as the accompanying

audio with MPEG-2 video (see Appendix).

2009/04/22 - 6

Media Profile

The BD standard is a private (non-open) standard at present and has on-going items to be standardized.

It is difficult to standardize a new media profile with MPEG-4 AVC supplement, because we cannot wait until the BD standard becomes an open standard.

We are not sure if WG13 is suitable for a new media profile standardization.