Comment 2 for bug 1432230

Here it is:

SoundConverter 2.1.5
** Message: pygobject_register_sinkfunc is deprecated (GstObject)
  using Gstreamer version: 0.10.36
  using 4 thread(s)
  using gio
Queue start: 1 tasks, 4 thread(s).
launching: 'giosrc location="file:///media/Multimedia/01%20-%20Unknown%20Artist%20-%20Track%201.wav" ! typefind name=typefinder ! fakesink'
have_type: audio/x-wav 01 - Unknown Artist - Track 1.wav
Queue done in 0.007s (1 tasks)
found_type 01%20-%20Unknown%20Artist%20-%20Track%201.wav
Queue start: 1 tasks, 4 thread(s).
launching: 'giosrc location="file:///media/Multimedia/01%20-%20Unknown%20Artist%20-%20Track%201.wav" name=src ! decodebin name=decoder ! audiorate tolerance=10000000 ! audioconvert ! audioresample ! faac bitrate=320000 ! mp4mux ! giosink location="file:///media/Multimedia/01%20-%20Unknown%20Artist%20-%20Track%201.wav~648307~SC~"'
got file duration: 309
found_tags: 01 - Unknown Artist - Track 1.wav
found_tags: 01 - Unknown Artist - Track 1.wav
/media/Multimedia/01 - Unknown Artist - Track 1.wav~648307~SC~ -> /media/Multimedia/01 - Unknown Artist - Track 1.m4a
Queue done in 5.029s (1 tasks)
Queue start: 1 tasks, 4 thread(s).
launching: 'giosrc location="file:///media/Multimedia/01%20-%20Unknown%20Artist%20-%20Track%201.wav" name=src ! decodebin name=decoder ! audiorate tolerance=10000000 ! audioconvert ! audioresample ! faac bitrate=64000 ! mp4mux ! giosink location="file:///media/Multimedia/01%20-%20Unknown%20Artist%20-%20Track%201.wav~873594~SC~"'
found_tags: 01 - Unknown Artist - Track 1.wav
found_tags: 01 - Unknown Artist - Track 1.wav
/media/Multimedia/01 - Unknown Artist - Track 1.wav~873594~SC~ -> /media/Multimedia/01 - Unknown Artist - Track 1.m4a
Queue done in 5.073s (1 tasks)
closing...
soundconverter --debug 11,79s user 0,39s system 28% cpu 43,047 total

The second "Queue start" refers to the same file after having changed the quality from the highest to the lowest level.
I didn't mention that I've alreay tried various types of input file (mp3, ogg, flac, wav) without luck.