Cannot play videos with AC3 audio codec

I just tested this and it is working just fine for my .mkv files. Can you attach one that doesn't work to this bug so that I can see if it's an issue with a specific file?

Here's one: http://notyetthere.org/data/testfile.mkv

Confirmed that this example file plays sometimes but not reliably. It works better when running media-hub-server via gdb.

The error is due to AC3 codec not being installed:

0:00:26.171799174 14659 0xb2f2c290 WARN uridecodebin gsturidecodebin.c:939:unknown_type_cb:<uridecodebin1> warning: No decoder available for type 'audio/x-ac3, framed=(boolean)true, rate=(int)48000, channels=(int)6, alignment=(string)frame'.
** Encountered a GST_STREAM_ERROR_CODEC_NOT_FOUND

Installing gstreamer1.0-libav solves the issue.

I confirm, the bug is still actual. I use bq M10, rc-proposed/r174.
Tablet is a multimedia device to a great extent. And significant part of video files comes with AC3 tracks. So I believe that fixing this bug is quite important.

As suggested by Alfonso on IRC (thank you!), I separated out a52dec plugin from gstreamer1.0-plugins-bad into a new gstreamer1.0-a52dec package, the latter has liba52-0.7.4 as dependency. Tested on mako, video posted in comment #2 works fine.

Alfonso, would it make sense to you to add this to the same silo as OPUS support or do you want to create a new one for this landing?