Ivo Gonçalves
2005-Nov-28 08:07 UTC
[Vorbis-dev] Big issue regarding channel order mapping in 5.1 has been reported
I know there's a bug tracker, and that is exactly the reason why I am posting this on the dev list. There has been a report from one of the foobar developers regarding oggenc on the HA forums, but he later posted it at the bug tracker as well. Three weeks have passed and no one seems to have noticed it was there. ~*~ URL: http://trac.xiph.org/cgi-bin/trac.cgi/ticket/736 Subject: incorrect 5.1 channel order handling in oggenc/oggdec Message: Oggenc appears not to remap 5.1 channel order from WAV order (L/R/C/LFE/BL/BR) to Vorbis order defined by xiph's specifications : six channels : the stream is 5.1 surround. channel order: front left, front center, front right, rear left, rear right, LFE Tested with rarewares build 2005-07-10. The same problem applies to oggdec (again assumes WAV channel order on libvorbis output, so it actually decodes incorrect oggenc output back to correct WAV). ~*~ There's also the discussion on HA, at [ http://www.hydrogenaudio.org/forums/index.php?showtopic=38618 ]. I believe that john33 from rarewares seems to be attempting to fix the issue on OggDropXPd according his post today in the thread. OK, it's bad already that Vorbis can't handle 5.1 well--if at all--but it's even worse when it gets the channel order wrong from the standard. I decided to bring the attention on this issue to the dev list because of this single post on the HA forums: "No, thank you. If they need third party contributors to fix trivial bugs in reference encoder/decoder, their project is short-lived anyway." This made me kinda sad considering it's almost true these days, especially with Monty away doing whatever he is doing that isn't Ogg and Vorbis development. Please do not get mad at me for attempting to get everyone's attention on this. --Ivo Gonçalves _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
Michael Smith
2005-Nov-28 08:13 UTC
[Vorbis-dev] Big issue regarding channel order mapping in 5.1 has been reported
On 11/28/05, Ivo Gon?alves <ivo_mmm@hotmail.com> wrote:> I know there's a bug tracker, and that is exactly the reason why I am > posting this on the dev list. There has been a report from one of the foobar > developers regarding oggenc on the HA forums, but he later posted it at the > bug tracker as well. Three weeks have passed and no one seems to have > noticed it was there.I saw it, but it was a pretty incoherent report. As far as I know, there is no vorbis spec for channel position mapping, and no references were given, so it's hard for oggenc to be "wrong" there. The bugtracking system is also really bad at bugtracking, which is part of the reason I haven't replied there. Mike