Lately all You Tube videos that are 1920x1280 have the audio stripped out and that is downloadable as a separate .mp4 file which is audio only. Will there be any way to recombine the two in future ConvertX to HD? I can't seem to find any software to do this. Has anyone else encountered this difficulty?
ConvertXtoHD is already able to merge an external audio track to your YouTube movie...
Just import your movie, then click on "+" button in audio tracks section.