Recording tv broadcasts to computer

i want to record tv broadcasts on my box
how ?
i want it to be suitable for good quality recording of anime series. something like mpeg 4 at 768X576 and good bitrate (about 1 GB / hour). and good audio like 192 mp3
the tv is analog composite video (of high quality - right out of the digital cable box) + stereo audio
video : conexant bt878 (works perfectly with kdetv)
audio : realtek ac97 line in
i want it to be schedule-able so i dont have to start stop it manually. console app i can wrap in a script and add to cron is best. gui app that can schedule stuff and generate automatically filenames is good too

i tried this
mencoder tv:// -tv driver=v4l2:norm=PAL:input=1:amode=0:width=768:height=576:adevice=/dev/dsp:audiorate=32000 -oac lavc -lavcopts acodec=mp2:abitrate=224 -srate 44100 -ovc lavc -lavcopts vcodec=mpeg1video -ofps 25 -of mpeg -endpos 1800 -o temp.mpeg
there is no audio (just silence) with both /dev/dsp and /dev/audio. happens under both kde 3.5 and 4.1. i played with the mixer in the desktop and it does not change anything
i did not figure out how to encode to anything other than mpeg 1. i really dont like its low quality
mythtv is huge overkill

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