When playing some ogg files, the current position is not updated properly

I have some ogg files here that were created from other files (like mp3, flv, whatever) using avconv -i inputfile.ext -vn -acodec libvorbis -aq 3 sound.ogg (the actual quality does not matter) When playing such a file in VLC, the position the playback is currently at (i.e., the position of the slider at the bottom) is not updated continuously like is usually is, but instead every 2 to 5 seconds, it "hops" on. Clicking somewhere to seek results in a delay of approximately the same time until playback starts at the new position. When closing VLC, playback continues for again approximately the same time after VLC was quit. The same issues (except for continuing to play after quit) are present when playing the file with Amarok using the VLC backend. However, those files play perfectly fine using mplayer or any gstreamer-based player (e.g. Amarok with the gstreamer backend), which makes it look like a VLC issue.

Bug 6983 may be related, as for these files VLC also shows an incorrect length.

I am using Debian testing, with VLC 2.0.2, avconv 0.8.3 and libvorbis 1.3.2. I do not know how to disable the ogg decode built-in to VLC to test if VLC with libvorbis works better.