[mythtv-users] ATSC Unwatchable

[Tyler T]

All of my ATSC channels come in clear except one. It has pretty much
the same symptoms you describe. It's not a channel that's important to
me so I haven't looked into it, I just assumed that that one
broadcaster was using some flavor of ATSC that VDPAU can't handle. I
think I remember watching the garbled recordings in VLC on Windows,
and they played fine.

Are you using VDPAU? If so, you might disable it to see if the problem resolves.