Re: [mpc-general] Adding a lossless mode to MPC SV8

> Third, I'd propose to separate entropy coding from the rest=3D20
> (just as the psymodel would be modularized too). This way I=3D20
> could implement a nice arithmetic coding layer for those who=3D20
> want to save maximum space ;-)

Arithmetic coding is adaptive, this will not save space, but increase =3D
needed
space. Because in an audio coder you only code small data sets (you want =
=3D
the
file to be randomly accessible) adaptive compression will not work.
A well tuned set of Huffman tables will probably compress much better =3D
and
allow much faster encoding and decoding.

Menno

>=3D20
> Regards
> Jo=3DEBl
>=3D20
>=3D20
> On Sat, 2003-10-04 at 19:22, Christian HJ Wiesner wrote:
> > Hi,
> >=3D20
> > as announced before, i would like to start a discussion=3D20
> here about the
> > above written subject.
> >=3D20
> > The reason i'm asking is, if we make the jump from SV7 to SV8, we=3D2=
0
> > should
> >=3D20
> > - guarantee backwards compatibiliy, means that old SV7=3D20
> files should be
> > convertable to SV8 ( with special tools ) in a lossless=3D20
> process, but=3D20
> > still be fully spec compatible SV8 files
> >=3D20
> > - make sure the SV8 specs offer a lot more functionailities=3D20
> than SV7,=3D20
> > so
> > that MPC SV8 can be used for hi-quality movie encodings as=3D20
> well as for=3D20
> > DVDs, where space is maybe not a big issue anymore
> >=3D20
> > - consider to check if its possible to allow peeling for MPC SV8, so
> > that users can store their MPC files with rather high=3D20
> bitrates on DVD or=3D20
> > CD media, but can peel the files down in bitrate so they could be=3D2=
0
> > transferred onto portable players ( of course, this is NOT=3D20
> a lossless=3D20
> > process anymore )
> >=3D20
> > - add a loss less mode to SV8, and the speciality here is=3D20
> that mixing
> > lossy and lossless modes in one and the same file should be=3D20
> possible,=3D20
> > just like in the upcoming Wavpack4 from David Bryant ( who=3D20
> i am copying=3D20
> > on this email, i dont wnat to 'steal' his idea without at=3D20
> least telling=3D20
> > him :-)  )
> >=3D20
> >=3D20
> > To make one thing clear out front, i dont know if Frank has thought
> > about all these things in his current specs, because i am=3D20
> sorry i am not=3D20
> > capable reading technical specs at all, but from a user=3D20
> perspective i am=3D20
> > convinced these features could lift MPC on a new level, and=3D20
> make a big=3D20
> > differentation from other formats.
> >=3D20
> > What you think ?
> >=3D20
> > Christian
> > MPC and matroska project admin
> >=3D20
> >=3D20
> > http://mpc.corecodec.org
> >=3D20
>=3D20
http://mpc.corecodec.org


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