[M4IF Technotes] help on Momusys

[Jani Huoponen]

Hi Mac,
> -----Original Message-----
> From: Yang, Wei Jian (Mac) [mailto:yangwj   lucent.com]
> Sent: 6. syyskuuta 2002 3:40
> To: 'technotes   lists.m4if.org'
> Subject: [M4IF Technotes] help on Momusys
> 
> 
> hello:
>  
> I debug Momusy-FDIS-v1.0-990812, using akiyo.ctl/cfg to 
> encode akiyo CIF
> YUV. I find out that even if I change the Target bit-rate for 
> vol from 64000
> to 9600, the reconstructed image quality is same. 
>  
> Can any one tell me reason?

Without knowing all the coding parameters you are using (like frame rate) I
would say that the sequence (CIF!)
cannot be simply compressed to a such a low bit rate (9.6 kbits/s), i.e.,
the 64 kbps could be close to being
the lowest bit rate that the encoder can achieve with the parameters you
used. So, even if you put 9.6 kbps as a target rate, the encoder cannot go
that low and thus the quality of the video is more or less the same as for
64 kbps. Check the file sizes of the compressed bit streams and calculate
the true bit rate the encoder used. With normal coding conditions that's the
lowest bit rate (and quality) you get with Momusys.
BR, Jani