Comment 0 for bug 872871

Due to changes in the ac3 encoder in libav the a52 alsa-plugin will no longer work.

speaker-test -Da52 -c6
[ac3 @ 0x1c14000] Specified sample_fmt is not supported.

A patch is available

http://git.alsa-project.org/?p=alsa-plugins.git;a=blobdiff;f=a52/pcm_a52.c;h=76f21cd003bfcfb8c3b07e003f04aca6132a7b79;hp=ed491b31c32a87a65258524b497d05d6e876fc0b;hb=40c129a160f37fe9488b2828d6299f99c269703e;hpb=06ca71522f1dc48b8503d945da81fdbcbab0aafa