[vorbis-dev] Re: overhead ??
francesco at gadaleta.org
Fri Dec 5 18:17:01 PST 2003
On Sat, 06 Dec 2003 01:10:45 +0000, Ralph Giles wrote:
> On Sat, Dec 06, 2003 at 01:13:50AM +0100, Francesco Gadaleta wrote:
>> "We simply add the lacing values for the total size; the last lacing value
>> for a packet is always the value that is less than 255. Note that this
>> encoding both avoids imposing a maximum packet size as well as imposing
>> minimum overhead on small packets (as opposed to, eg, simply using two
>> bytes at the head of every packet and having a max packet size of 32k.
>> Small packets (<255, the typical case) are penalized with twice the
>> segmentation overhead). Using the lacing values as suggested, small
>> packets see the minimum possible byte-aligned overheade (1 byte) and large
>> packets, over 512 bytes or so, see a fairly constant ~.5% overhead on
>> encoding space."
> This paragraph gives motivation for the method of marking packet length. What is unclear? I'm
> happy to elaborate, you do not say what is it you would like explained.
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<p>this encoding both avoids imposing a maximum packet size as well as
imposing minimum overhead on small packets.
The question of overhead is unclear.
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