Like other *buntus, Myth Buntu boots into a live CD system.
Myth Buntu Public Alpha 3 is based on development builds of Ubuntu 7.10 "Gutsy Gibbon," and provides users with Myth TV version 0.20.1.
It is available as a 423MB ISO image via Bit Torrent download.
Myth Dora 4 is built on top of Fedora Core 6, also providing Myth TV 0.20.1, and is available (via direct download only) as a 1.0GB DVD ISO image or as two CD-sized ISO images.
Knopp Myth R5F1 is built from scratch using pieces of Knoppix 5.0 and Debian Sid; it comes with a slightly older version of Myth TV -- a patched version of 0.20 -- and is available through Bit Torrent as a 584MB ISO.
I tested all three distros on two configurations: an Intel-based test machine with both analog and digital capture cards, and a VMware virtual machine through which I captured the lovely screenshots littered about this page. The installer misconfigured X by attempting to use the disabled onboard video instead of the attached video card.
Once you burn a disc and pop it into the optical drive, all three contestants follow the same basic playbook: install the operating system, set up Myth TV's back end, then launch the Myth TV front end. Normally that is a fixable mistake, but when the live CD fails to start X and drops to single-user mode, you first must repair xorg.conf, then figure out how to resume the installation process.
Since Myth Buntu is at such a preliminary release stage, this problem will probably get fixed when upstream Gutsy Gibbon stabilizes.
No remixes are supported by or affiliated with the Fedora Project, but the remixes listed in this category are those whose latest releases are based on Fedora releases which are currently supported by the Fedora Project (presently Fedora 23 & Fedora 22).
Remixes included in this category are those whose latest releases are based on Fedora releases which have reached end-of-life (EOL) status; however, the respective remix providers might support these remix releases despite their upstream's EOL status.
My curiosity toward Myth TV-specific distros was touched off by Myth Buntu's latest release earlier this month, Public Alpha 3.
I run Ubuntu on my primary desktop machine, and had a relatively painless experience installing Myth TV on it courtesy of the official repositories.