[Adaptive Muxer]       fixed first subtitle unintended set to default. Bug #774


git-svn-id: http://svn.code.sf.net/p/megui/code@2504 a21b8521-4df1-4ed3-b48c-cff5bc73dcb3
[Audio Encoder]        fixed wrong channel count mismatch warning for AVS files. Bug #767


git-svn-id: http://svn.code.sf.net/p/megui/code@2505 a21b8521-4df1-4ed3-b48c-cff5bc73dcb3