[Swfdec] no suitable decoder for audio codec 2

[Dennis Heuer]

hello

i tried both swfdec-0.6.6 and current git with full gstreamer install
as well as with libmad. however, i get the below error message:

swfdec_codec_audio.c(205): swfdec_audio_decoder_new: no suitable
decoder for audio codec 2

i'm not shure if 'audio codec 2' means AC2? with gst-inspect,
i find only one related tag: ffenc_ac3.

what's missing here?

dennis