When using boxes like the typical YPbPr to VGA transcoder (e.g. X2VGA 2) I reckon that the audio (red and white audio RCA) of the component cable are always left out.
My question is. If one could find a splitter cable that has two RCA females at one end, and a 3.5mm stereo female at the other end, would it possible to plug headphones directly?
Yes? No? Why?
If the answer is no, would it be possible to use something like this

to plug audio into a Line In PC sound card and listen through headphones plugged to the Line Out of the PC?
Would it be better/possible to do that plugging the audio to the Mic in of the sound card?
thanks for the help!