[CELT-dev] drawback when using very small frame sizes ?

Jean-Marc Valin jmvalin at jmvalin.ca
Wed Jan 19 13:28:21 PST 2011

Marko <celt at platax.de> a écrit :
> 1.
> Can you give a rough estimation for the quality decrease, maybe in  
> percentage of required bit rate ?

Consider this as a *very* rough rule of thumb. The overhead in bit/s  
should be in the order of

80*(1000/frame_size - 50)

where frame_size is in ms.

> 2.
> Is there a tool to meassure quality of a codec like CELT ?

You should normally find two such tools attached to your head.  
Otherwise, there's always PQevalAudio, but be aware that like all  
objective quality measurement, it sucks at matching the real quality  
(it's a very good tool for some specific things, but unless you're  
aware of its limitations, relying on it may be harmful).


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