[vorbis] Bit Rate Peeling Quality

[Daniel Schregenberger]

 ('binary' encoding is not supported, stored as-is)
J C Fitzgerald wrote:

> Let me ask this question of the group:  When bit rate peeling becomes
> available, how will the quality of the peeled Vorbis file compare to a
> file encoded at the target quality directly from the original?
> 
> So, for:
> 
>	a.wav --> b.ogg (at q6) --> c.ogg (at q2)
>	a.wav --------------------> d.ogg (at q2)
> 
> how are c.ogg and d.ogg likely to compare in terms of audio quality?

I remember someone said it will be a little worse.

> Also a related question (in terms of my proposed use):  Are there likely
> to be any changes to the Vorbis codec which will cause problems doing
> bit rate peeling in, say, four years time on a file encoded today with v1?

AFAIK: no. Major changes to the format of the vorbis files would be bad at this
point anyway. Now the HW-Players start to implement Vorbis and more and more
people use it.
Monty will change something minor to the Vorbis format, which is basically just
a rearrangement and won't break backwards compatibility and may also be applied
to files encoded with older versions. This rearrangement will make the peelers
life easier.
This is how I understand this. Please correct me if something is wrong.

-- Daniel

--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'vorbis-request at xiph.org'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.