Dubstepforum.com

Don't use audacity...go to your local electronic shop...like radio shack in
The US...buy a cheap female RCA to headphone mini male adapter...
Hook the RCA outputs from your DVD player into the mic input of your pc
Or interface. (Could also get an RCA to qtr inch if you have qtr inch...)
Then open your daw, set your input routing and record.
I use the headphone out of my phone to record YouTube clips I wish to sample. Use
Headphones to monitor as your recording and watch the wave forms as your record. Set
Any volume levels from your source a bit above half...unless it is low volume. In that
Case find a better source to sample.
If all else fails use a mic and record directly from your tv or surround sound speakers.

Hope this helped...

Audacity will work fine, the low volume problem is probably the media player you're using. There's no reason to buy parts or use an actual DVD player as all they basically are is a limited computer with a proprietary media player installed. Grab VLC or MPC and in the audio options select downmix to stereo or switch the audio track to stereo 2.0, that will make it louder. A program called ffdshow will also do it, you might already have it installed or it comes with the above software. DVD players just do it by default. There's also some good compression and audio boosting options in VLC/MPC.