[Mp4-tech] Question about definition of Profiles@Levels for VisualEncoder

[Peter Haighton]

The size of the image is specified in the number of macroblocks. For
example SP L1 says that the maximum number of Macroblocks is 396 which can
be arranged in many different ways
such as
22MBx18MB = 352x288 (CIF)
or
1MB x 396 = 16x6336
or any other combination that fits this. In this example 480x720 would not
be possible because that would require 1350 Macroblocks.
When it says typical it means the many applications would use.
Peter
> -----Original Message-----
> From: mp4-tech-bounces lists.mpegif.org
> [mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of Rosiles
> Gerardo-ra9355
> Sent: Friday, August 01, 2023 10:26 AM
> To: MP4-Tech
> Subject: RE: [Mp4-tech] Question about definition of Profiles Levels for
> VisualEncoder
>
>
> Actually, this I find an interesting point which I have
> pondered. What is the meaning of "typical session size"? For
> instance if the typical size is CIF, does the standard imply we
> can also have 480x720 sessions?
>
> Thanks,
>
> Gerardo
>
> >>Since encoders aren't standardized, and thus no lower bounds
> specified, I'm confused about >>the meaning of "support" and
> why is there a "typical session size". I thought that "typical
> >>session size" was a lower bound (for encoder).
>
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