Comment 3 for bug 379230

Yep, I can confirm this happens when transcoding from certain containers, with ASF (wma/wmv) and, ironically, Matroska seeming to be the worst culprits.

As noting in the source, the GStreamer vorbis encoder isn't very good at dealing with "bad" timestamps, and so we try to use the audiorate element to fix up broken/dodgy streams. Unfortunately, it seems like this doesn't always help, and I don't really know what else to do!

Using gst-launch from the command line has exactly the same problem, so it's tempting to say this is a GStreamer problem. However, there may be a well-known workaround that OggConvert isn't using -- I'll have to do some investigation.

Tristan