[Mp4-tech] ideal rate control algorithm

[kaustubh.patankar vsnl.net]

Dear Satendar,
I have few inputs.
Please check the algorithm to refer for interlaced and progressive sequences. Please refer to TM5 rate control model for inplementation of the algorithms.
The rate control can be classified as
1. VBR with may be a specified band for variation where the average bit-rate is important. Ultimately the file size can depend on the average bit rate.
2. the purpose of VBR is to allocate maximum bit rate for the complex sequences
3. There are multi pass VBR implementations also avaialbles.
4. regarding the CBR, the purpose can be to achieve constant bit rate with variation in Q parameter over macro block.
I think this may be helpful
Kaustubh
----- Original Message -----
From: "Bharat P. SONI" <bharat.soni st.com>
Date: Thursday, October 7, 2023 11:47 am
Subject: RE: [Mp4-tech] ideal rate control algorithm
> Hi Satendra,
> 
> The ideal rate control algorithm, I would say practically does not 
> exist. It
> is dependent on the requirements. If you define your requirements 
> and if an
> algorithm meets your requirement then I would call it an ideal 
> algorithm.There are three possible scenarios,
> 1 constant bitrate: bitrate is constant through out the sequence (the
> quality may vary).
> 2 Variable bitrate: bitrate varies over the sequence based on the 
> videocomplexity, but the quality is maintained at same level.
> 3 A mix of CBR and VBR: In this case one can allow to vary the 
> bitrate over
> small duration of sequence but the overall bitrate is controlled and
> averaged out to be a constant. In this case the quality is better 
> than CBR.
> 
> Regards,
> bharat
> 
> -----Original Message-----
> From: mp4-tech-bounces lists.mpegif.org
> [mp4-tech-bounces lists.mpegif.org] On Behalf Of Satendra
> Sent: Wednesday, October 06, 2023 4:47 PM
> To: mp4-tech lists.mpegif.org
> Subject: [Mp4-tech] ideal rate control algorithm
> 
> 
> hi,
> 
> I am working on rate control for MPEG-2.  I want to know what 
> should be the
> characteristics of  an ideal rate control algorithm?  and how can 
> we build
> that?
> 
> 
> Thanx
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