It could be possible that the DVD player cannot read the audio track or is not correctly reading the overall disc itself.
If you put the burned DVD into the computer, does it play correctly?
First, you need to verify if it is the disc or the player that is not correctly working, if the computer itself cannot correctly read the disc, then the problem is either the disc or the way it was burned to disc.
Another thing to note, not all players support +R, so you might need to check that your player supports that disc format.