I’m trying to put them on one DVD.
For the Audio, I am using the default settings.
Volume Control is set to 0 with the check box of Volume Normalization being selected.
Under the AAC Parameters, the MPEG type is MPEG-4, Object Type is Main. Under the MP3 Parameters, Encode has CBR selected, MP3 volume is set to default, VBR Quality is greyed out, Audio Quality is default.