Hi all, I started testing the RC1 encoder at ftp://sjeng.sourceforge.net/pub/sjeng/oggdrop.exe (based on branch_monty_20010708) On the songs I have tested so far (not much :) I did not hear any stereo issues, but there are some very noticeable problems with the produced files. Songs without much high-end will suddenly have one when encoded. (you'd expect it the other way around) It nearly sounds as if the encoder adds 'hiss'. Beta4 at 128Kbps does not have the same artifacts. Monty noted on IRC:>>>The biggest to expect is that very high frequency diffuse noise will tend to shrink toward a point.>>>However, this sounds like it's something else than what I am experiencing. -- GCP --- >8 ---- List archives: xiph.org/archives Ogg project homepage: xiph.org/ogg To unsubscribe from this list, send a message to 'vorbis-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
> Songs without much high-end will suddenly have one > when encoded. (you'd expect it the other way around) > It nearly sounds as if the encoder adds 'hiss'. > > Beta4 at 128Kbps does not have the same artifacts. >There is a discussion going on about it here: 66.96.216.160/cgi-bin/YaBB.pl?board=c&action=display&num=994299736 People mention the exact same problem you bring up there as well. Dibrom --- >8 ---- List archives: xiph.org/archives Ogg project homepage: xiph.org/ogg To unsubscribe from this list, send a message to 'vorbis-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
On Sun, Jul 15, 2001 at 02:32:11AM +0200, Gian-Carlo Pascutto wrote:> Hi all, > > I started testing the RC1 encoder at > > ftp://sjeng.sourceforge.net/pub/sjeng/oggdrop.exe > > (based on branch_monty_20010708) > > On the songs I have tested so far (not much :) > I did not hear any stereo issues, but there are > some very noticeable problems with the produced files. > > Songs without much high-end will suddenly have one > when encoded. (you'd expect it the other way around) > It nearly sounds as if the encoder adds 'hiss'.Actually, what I think you're describing is that hiss from across the stereo image is being moved/concentrated in the center by the >4kHz point stereo. In the process of doing so, the encoder is not accounting for the increase in noise energy because the polar mapping isn't circular (an energy of .5 is becoming a total energy of 1. when the hiss is centered). Both aspects of the problem can be controlled, the current encoder doesn't try. Does that sound about like what you're hearing? Monty --- >8 ---- List archives: xiph.org/archives Ogg project homepage: xiph.org/ogg To unsubscribe from this list, send a message to 'vorbis-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
I think I've heard that some MP3 players that also play OGG "enhance" the playback and boost up the high end since MP3 flattens it. Ogg's, apparently, is stronger... so it come on even more. Any truth to that? -----Original Message----- From: owner-vorbis-dev@xiph.org [mailto:owner-vorbis-dev@xiph.org]On Behalf Of Gian-Carlo Pascutto Sent: Saturday, July 14, 2001 7:32 PM To: vorbis-dev@xiph.org Subject: [vorbis-dev] Some very early RC1 results Hi all, I started testing the RC1 encoder at ftp://sjeng.sourceforge.net/pub/sjeng/oggdrop.exe (based on branch_monty_20010708) On the songs I have tested so far (not much :) I did not hear any stereo issues, but there are some very noticeable problems with the produced files. Songs without much high-end will suddenly have one when encoded. (you'd expect it the other way around) It nearly sounds as if the encoder adds 'hiss'. Beta4 at 128Kbps does not have the same artifacts. Monty noted on IRC:>>>The biggest to expect is that very high frequency diffuse noise will tend to shrink toward a point.>>>However, this sounds like it's something else than what I am experiencing. -- GCP --- >8 ---- List archives: xiph.org/archives Ogg project homepage: xiph.org/ogg To unsubscribe from this list, send a message to 'vorbis-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered. --- >8 ---- List archives: xiph.org/archives Ogg project homepage: xiph.org/ogg To unsubscribe from this list, send a message to 'vorbis-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.