Hi,
I had the same problem on Ubuntu 10.04 64 bits desktop edition.
Every audio files sits on a NTFS type of partition. Some files duration are
tagged "unknown" and others are the correct length shown.
I resolved the problem by deleting the media DB file :
~/.local/share/rhythmbox/rhythmdb.xml so the next time rhytmbox is started it
have to rebuild the DB. That new import is showing lenght correctly, for all
audio files without exception. So there was a problem during the initial and
first build of the DB (maybe at that time my environment missed a codec or
something needed by rhytmbox to do the job correctly??).
You'll see above some dpkg -l to see installed version of softwares.
You'll also find a copy of the corrupted rhythmdb.xml in attached file.
Here is the output of "dpkg -l | grep gstrea"
ii bluez-gstreamer 4.60-0ubuntu8
Bluetooth GStreamer support
ii gstreamer0.10-alsa 0.10.28-1
GStreamer plugin for ALSA
ii gstreamer0.10-ffmpeg 0.10.10-1
FFmpeg plugin for GStreamer
ii gstreamer0.10-gnonlin 0.10.15-1
non-linear editing module for GStreamer
ii gstreamer0.10-nice 0.0.10-2build1
ICE library (GStreamer plugin)
ii gstreamer0.10-plugins-bad 0.10.18-1ubuntu1
GStreamer plugins from the "bad" set
ii gstreamer0.10-plugins-base 0.10.28-1
GStreamer plugins from the "base" set
ii gstreamer0.10-plugins-base-apps 0.10.28-1
GStreamer helper programs from the "base" se
ii gstreamer0.10-plugins-good 0.10.21-1ubuntu2
GStreamer plugins from the "good" set
ii gstreamer0.10-plugins-ugly 0.10.14-1
GStreamer plugins from the "ugly" set
ii gstreamer0.10-pulseaudio 0.10.21-1ubuntu2
GStreamer plugin for PulseAudio
ii gstreamer0.10-tools 0.10.28-1
Tools for use with GStreamer
ii gstreamer0.10-x 0.10.28-1
GStreamer plugins for X11 and Pango
ii libgstreamer-plugins-base0.10-0 0.10.28-1
GStreamer libraries from the "base" set
ii libgstreamer0.10-0 0.10.28-1
Core GStreamer libraries and elements
and "dpkg -l | grep rhy"
ii rhythmbox 0.12.8-0ubuntu4
music player and organizer for GNOME
ii rhythmbox-plugin-cdrecorder 0.12.8-0ubuntu4
burning plugin for rhythmbox music player
ii rhythmbox-plugins 0.12.8-0ubuntu4
plugins for rhythmbox music player
ii rhythmbox-ubuntuone-music-store 0.0.9-0ubuntu1
Ubuntu One Music Store Rhythmbox plugin
** Attachment added: "rhythmdb.xml.bak"
http://launchpadlibrarian.net/50654751/rhythmdb.xml.bak
--
Most mp3 files listed with "Unknown" length
https://bugs.launchpad.net/bugs/334082
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