On Sat, Aug 12, 2006 at 10:05:02PM -0400, Gregory Maxwell wrote: > On 8/12/06, Ian Clarke <ian at revver.com> wrote: > [snip] > >>Most AVIs can be compressed by a further 1%. > >I doubt it, except perhaps for small AVIs, and I certainly doubt that this > >is true of most > >compressed video formats. Generally speaking information theory tells us > >that > >compressing data that has already been compressed is rarely effective. > > All seekable media format impose at a minimum a constant (as a > function of time) header overhead for seeking and syncronization. Some > formats are better than others. AVI isn't especially great. 1% for > normal web bitrate video of any length wouldn't be shocking to me.
And 23% for MPEG! > > As far as compression goes for big media files... let the application > do it.. or better, tell people to use more efficent formats. If we let the application do it, don't we end up with a hundred different mutually incompatible ways of doing it? One app uses a separate client metadata document, another uses a .avi.gz ... -- Matthew J Toseland - toad at amphibian.dyndns.org Freenet Project Official Codemonkey - http://freenetproject.org/ ICTHUS - Nothing is impossible. Our Boss says so. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: Digital signature URL: <https://emu.freenetproject.org/pipermail/tech/attachments/20060814/8a34a577/attachment.pgp>
