No, audiomuxer can do that, assuming you have a DTS/Dolby encoder that does lossless. The free DTS encoder that come with audiomuxer is only DTS "core".
For"DVD" what you actually want is AVCHD (BD format on DVD media) to enable lossless.
96/24 on DVD (DVD format) is "high quality" but not lossless.
From Wikipedia:
DTS-HD Master Audio[edit]
DTS-HD Master Audio, previously known as
DTS++,
[18] is the second of two DTS-HD audio formats.
[19] It supports a virtually unlimited number of surround sound channels, can deliver audio quality at bit rates extending from lossless (24-bit, 192 kHz) down to DTS Digital Surround and, like Neo,
downmix to 5.1 or 2.1 systems.
DTS-HD Master Audio is selected as an optional surround sound format for
Blu-ray, where it has been limited to a maximum of 8 discrete channels. DTS-HD MA supports variable bit rates up to 24.5 Mbit/s, with up to
6 channels encoded at up to 192 kHz or
8 channels and nine objects encoded at 96 kHz/24 bit. If more than two channels are used, a "channel remapping" function allows for remixing the soundtrack to compensate for a different channel layout in the playback system compared to the original mix.
All Blu-ray players can decode the DTS "core" resolution soundtrack at 1.5 Mbit/s, however, as DTS-HD Master Audio is also implemented as a standard DTS core plus extensions, but cannot decode audio from DTS audio CDs.
DTS-HD Master Audio and Dolby TrueHD are the only technologies that deliver compressed lossless surround sound for these new disc formats, ensuring the highest quality audio performance available in the new standards. (DTS Coherent Acoustics' coding system was selected as mandatory audio technology for Blu-ray Discs.
[20]