According to the error presented above, the RealPlayer is having a problem encoding your source files. In this case, it's recommended to replace the codecs in your computer. First uninstall everything you have about codecs, then download and install a new set of codecs from the application's page at Software Informer. Once the codecs have been installed, start a new burning process, but this time make sure to configure the settings for burning. Go to Settings and change the Audio to MP3, OFF or MP4.