Sven Over
2002-Jan-06 07:12 UTC
[vorbis-dev] Major quality decrease in RC3 compared to RC2
Hello... I was very surprised when I found, that oggfiles created with RC3 are much worse than files made with RC2. I have some example sound file set up for you on the net. The difference is *obvious*. While RC2 made ogg-files, which I would say are perfect (at least I cannot hear a difference to the original), the quality of RC3 is *bad*. Let me first say, that I used libvorbis0, libogg0 and vorbis-tools Debian packages. After I discovered the quality decrease, I compiled the libraries and vorbis-tools from source, both using gcc 2.95.4 and gcc 3.0.3, each of which gave the same result: bad quality. Here's the proof: Original WAV-File (~5MB) http://stud.physik.uni-dortmund.de/~svenor/joy.wav Same as FLAC-File (~3.5 MB) http://stud.physik.uni-dortmund.de/~svenor/joy.flac And as MP3 with very high quality and bitrate (~1MB) - I think this is okay for comparison so that you do not need to download one of the above http://stud.physik.uni-dortmund.de/~svenor/joy.mp3 The ogg files: Made with RC2 (perfect result) http://stud.physik.uni-dortmund.de/~svenor/joy_oggrc2.ogg Made with RC3 (crap, simply speaking) http://stud.physik.uni-dortmund.de/~svenor/joy_oggrc3.ogg I used the following command line to generate the oggs: oggenc -b 128 -o joy_oggrc2.ogg joy.wav oggenc -b 128 -o joy_oggrc3.ogg joy.wav ...for creating the mp3 file I used: lame --abr 256 -q 0 joy.wav joy.mp3 I think here is some bug involved. Same command line should not produce a result with RC3 that is so much worse than with RC2. Believe me, the quality of RC3 here is really *bad*. Download my sample files, try to create your own oggs from them. (Of course, I used the .wav-file for generation. As FLAC is lossless, you can make the wav from the FLAC file.) Please! Find that bug! Ogg is such a great codec, I was just going to render my hole cd collection to ogg instead of mp3. In fact, I already begun. Thank you all for that great great work. But the quality of RC3 here is inacceptable, sorry. Thanx in advance! Good luck! -- Sven Over An der Stipskuhle 42 svenover@svenover.de 44141 Dortmund svenor@student.physik.uni-dortmund.de Telefon: 0231-5648658 http://www.svenover.de/ PGP: Public-Key-ID: F56F17C6 Fingerprint: B9 62 44 D4 AE 9E DE F6 88 C5 CD 67 73 7D 18 95 F5 6F 17 C6 <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.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.
volsung@asu.edu
2002-Jan-06 08:39 UTC
[vorbis-dev] Major quality decrease in RC3 compared to RC2
On Sun, 6 Jan 2002, Sven Over wrote:> I used the following command line to generate the oggs: > oggenc -b 128 -o joy_oggrc2.ogg joy.wav > oggenc -b 128 -o joy_oggrc3.ogg joy.wavBitrate management has changed in RC3. Please repeat your test with a quality setting rather than a bitrate setting. You will get what you were expecting with: oggenc -q 3.5 -o joy_oggrc3.ogg joy.wav --- Stan Seibert <p><p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.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.
Greg Stark
2002-Jan-06 13:14 UTC
[vorbis-dev] Re: Major quality decrease in RC3 compared to RC2
Jack Moffitt <jack@xiph.org> writes:> > Bitrate management has changed in RC3. Please repeat your test with a quality > > setting rather than a bitrate setting. You will get what you were expecting > > with: > > We're going to have to do an updated release of vorbis-tools deprecating > -b. Otherwise everyone is going to be upset.Perhaps -b should control the quality settings with values like 64, 128. And you should use a new option for bitrate management instead of -b. -- greg <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.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.
Aleksandar Dovnikovic
2002-Jan-07 05:57 UTC
[vorbis-dev] Re: Major quality decrease in RC3 compared to RC2
Sven Over <svenover@svenover.de> wrote:> As soon as you know ogg vorbis, you know that mp3 sucks!This could be a nice tagline... :-) <p><p><p><p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.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.