Hello everyone! I have finally found the problem!
I did a little experience: I enabled the AC97 soundcard in my motherboard and connected the output of the TV card to it instead of to the Audigy. No more crackling! However, I noticed the volume is way too high! The TV card seems to be outputting sound at a very high level. The Audigy tolerated this, but not my AC97 card. Not very serious though, I'm getting an attenuator to solve the problem.
The high levels were however not the problem, since the crackling only happened in MythTV and not when I recorded TV sound in other programs.
So, the crackling I experienced is probably MythTV not liking my soundcard (Audigy 2, emu10k1 kernel module), since in all other programs, and all the playback and recording experiments I did there was never a crackle or pop. The emu10k1 factor is also consistent with Michael Cowell's setup, who posted his similar problems. It must be something in the emu10k1 driver that MythTV doesn't like.
So, what I can say is, if you have a TV card with a dongle cable to connect to a line-in, don't connect it to an emu10k1. MythTV won't like it!
Thanks for bearing with me! Sérgio Gomes
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