[vlc-devel] Re: OGG, AC3 encoder and maximum bitrate for video encoding

Måns Rullgård mru at inprovide.com
Sun Dec 11 23:45:14 CET 2005

Derk-Jan Hartman <hartman at videolan.org> writes:

> On 11-dec-2005, at 14:46, Håvar Nielsen wrote:
>> The player does not seem to recognize comments in ogg streams.
> I believe all comments in ogg files are added to the Information
> dialog. The problem however is that OGG comments are not
> standardised, and therefore an artist/title pair match cannot always
> be made.

In a fit of lunacy, the creators of the Ogg format and Vorbis codec
decided to place the comments in Vorbis stream, and not at the Ogg
container level.  Hence, talking about Ogg comments is meaningless.
That said, the Vorbis comments are free-form, but there is a
recommended set which should be supported.
See http://xiph.org/vorbis/doc/v-comment.html

>> And it doesn't handle 5.1 OGG sound very well.
> I'm not sure if this is implemented at all in VLC. I am sure that
> it's not much tested at the very least :D

Not even oggenc/oggdec handle this very well.  It's not terribly
difficult to do it though, assuming VLC already knows how to deal with
5.1 audio in general.

Måns Rullgård
mru at inprovide.com

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