Blue Velvet tested OK for Blender version 2.73a with Ardour 3.5.403 and FFmpeg 2.5.3.
There’s also an improvement on the way the addon reads the strips on the timeline – if user would have changed the strip’s name to anything that didn’t have an extension (such as “my_audio” instead of audio.wav or audio_repeated.002), the script would throw the error “ValueError: need more than 1 value to unpack”. This behaviour is now fixed. Thanks Bilka from France for pointing this out!
Updating Blue Velvet is recommended.