Another excellent way to convert MP4 to MP3 would
Another excellent way to convert MP4 to MP3 would be to use the video converter software at MP4Converter.net. This converter really has everything you could ask for – the setting of samples and bitrates, all you need for batch conversion and stereo and mono settings as well as the play options to test input and output sources. You could download it as a shareware version but after a certain period of time, you have to pay for it.