KDENLIVE build 0.7.9 rev. 5427
Project defined as either DVD Wide screen NTSC or HD 1080p 29.97 fps
add 1 clip (either MTS or MKV) source file format is 1080p 30 fps, 45 seconds long
Drag it to video 1
Pressing Play in Clip Monitor and Project Monitor both play the expected audio
Press the Render button
Either Export Audio or Export Audio Automatic
Encoder threads either 1 or 2 (CPU is Intel Core i5)
Render to File
Play the rendered VOB file in VLC,Xine, Kaffeine. Picture looks great, Audio is mute.
Re-render the same project as YouTube 1280x720 and the Audio is present.