How do you make an audio CD on Ubuntu Linux?

I downloaded some flv and extracted the pcm track from them with mplayer. I can play the audio on the computer, so that seems to have worked fine.

Next I tried to make an audio CD that would play on a regular cd player from them. I fired up the default burning app (I dont remember what it was called, but it is the one that gets installed by default in ubuntu). I add the .wav files to the audio project, hit the burn button, and it works for 15 mins or so then comes back and says there is not enough room on the disk.

I am using 700M , 80 min CD-R blanks. The app says I have just over an hour of music queued up. I ran du -sh on the folder with all my .wav and it says there are 512M worth of files.

What am I doing wrong? Do I need to encode my audio as something other than pcm/wav? Is there a command line I can use? cdrecord? I have made coasters out of 2 blanks and I am getting frustrated.

TIA