[mythtv-users] MKV files play without sound in Mythtv

[Dave M G]

MythTV users,

I have Mythbuntu 10.04.

I ripped a DVD using Handbrake into .mkv format, using the "lame" MP3 
encoder for sound.

When I attempt to play the file within MythTV Internal player, I get no 
sound.

On the same machine, if I close MythTV front end and play the files 
using VLC, Totem, or Mplayer, it plays fine.

However, if I go into MythTV setup and select to use any one of those 
players in place of "Internal", I get no sound.

For some reason, the MythTV front end will not allow sound for MKV 
files. Other file typs, notably old AVI files, play fine.

How do I get sound working consistently in MythTV so that it will play 
the sound in my MKV video files?

Any advice much appreciated.

-- 
Dave M G