Don't use non-standard extensions
Run the script in zsh

Get channels information from decoder specific config
Add (commented) useless variables from ADTS header
Detect unsupported configurations and start (commented) support

plus a bit of code factorisation

Note that saving multi-key combinations will fail right now.

Will remove the legacy tar.gz. If you build the contribs, you need SVN and git.

Don't test for attribute visibility, because it doesn't support it, but it will pass the test and fill the warning output with messages.
Profit to s/enable-pp/enable-postproc in the comments.

if( bla ) free( bla ); => free( bla );

In the same time add spaces in order to follow code convention.