Bad audio quality when converting from AAC to Vorbis

[Jarno Suni]

Binary package hint: soundconverter

When I convert video http://www.youtube.com/watch?v=hckcdyQad0I (available as a /tmp/Flash*) to Ogg Vorbis, the result is low quality audio file, even if setting for quality is "High". I can hear snapping when playing by some players. For what it is worth, the quality is very low, if I play the file by alsaplayer (0.99.80), by which I have had no problem with other Ogg Vorbis files (as long as filename extension is .ogg).

ProblemType: Bug
Architecture: i386
Date: Sun Jan 17 15:38:22 2010
DistroRelease: Ubuntu 9.10
InstallationMedia: Xubuntu 9.10 "Karmic Koala" - Release i386 (20091028.3)
Package: soundconverter 1.4.4-0ubuntu1
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-17.54-generic
SourcePackage: soundconverter
Uname: Linux 2.6.31-17-generic i686

[GautierPortet (kassoulet)]

I tried to convert the exact same file, and you are right, something is wrong when converting to ogg vorbis.
Every other formats have a correct sound.
I'm going to investigate on this issue, to determine if it's soundconverter fault, or if the problem should be pushed upstream to gstreamer.

[GautierPortet (kassoulet)]

Tested with another .flv, same results.
Converting to wav and then to vorbis works as expected.

[GautierPortet (kassoulet)]

I can reproduce the problem with gst-launch, so I blame gstreamer ;)

Anyway, the problem disapears if i insert "wavenc ! wavparse" in the pipeline. That is, convert to wav and back.
Something really strange is happening here, and I can't find out why.

[GautierPortet (kassoulet)]

reported upstream: https://bugzilla.gnome.org/show_bug.cgi?id=607641

[GautierPortet (kassoulet)]

It works when converting to wav and flac, and fails converting to vorbis and mp3 BTW.

[Charlie Kravetz (cjkgeek)]

I am marking this confirmed; the issue has been reported upstream.

[psl (slansky)]

Check bug report #792742 related to OGG corruption.

[ill (illumilore)]

This bug does not happen in the kde soundkonverter app (which I stopped using around a year and a half ago because it had some bug that caused very similar corruption issues), so that might work as a replacement until this is fixed.