1) TVtime (that's what the original poster uses): doesn't handle audio
at all (but I was told that there is a fork that does), assumes that
there is a zero-latency analog wire coming from the TV tuner audio
output to the sound card's "TV" input. That's why the OP asks about
module-loopback and/or parec|pacat solution, as a replacement of the
said wire. Due to the now-invalid assumption about the wire, zero
latency is needed. Because the audio chain is external to tvtime,
there is no possibility for any A/V sync queries.

Isn't the simplest solution to add a fixed delay for the video in TVtime, and apply the same fixed delay in module-loopback? Any attempts to emulate the behavior of an zero-latency analog wire with PulseAudio aren't very likely to succeed :-)
-Pierre

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