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

[ramakrishna_kakarala agilent.com]

On this topic, what does it mean when the maximum  
bitrate is specified, i.e., 64000 bps for SP L0?
How is bitrate defined?  For example, it is the
total number of bits sent over the last second
at every point in time?  
thanks
---------------------------------
Ramakrishna Kakarala  
Agilent Technologies  
5301 Stevens Creek Blvd, MS 51L-GX
Santa Clara, CA 95052-8059
ramakrishna_kakarala agilent.com 
Tel (408) 553-2349
Fax (408) 553-3794
> -----Original Message-----
> From: Rob Koenen (MPEGIF) [mailto:rob.koenen mpegif.org]
> Sent: Thursday, July 31, 2023 11:02 PM
> To: 'Allen H.Y. Chin'; MP4-Tech
> Subject: RE: [Mp4-tech] Question about definition of 
> Profiles Levels for
> VisualEncoder
> 
> 
> Allen,
> 
> > Is it correct to say a compliant encoder produces bit 
> stream that do not
> > exceed the max values of Video Buffering Verifiers?
> 
> It is correct to state that any bitstream that does not exceed these
> bounds is compliant. It is hard to talk about compliant 
> encoders, because
> encoders aren't standardized, but in general one could say that any
> decoder is compliant if it only produces compliant bitstreams.
> 
> > And what are the lower bounds for certain Profile Level? it 
> > it the upper bound of the lower level?
> 
> There are no lower bounds for encoders / bitstreams. A 
> compliant decoder
> must at minimum be able to decode all compliant bitstreams. 
> In general, 
> again, a conformance point gives a maximum complexity for 
> bitstreams (and
> thus encoders), and minimum performance measures for 
> decoders. Think of
> it as a bar - the decoder must be above the bar, the bitstreams (and 
> encoder) must remain below the bar.
> 
> Best,
> Rob
> 
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