Most people use lossless audio codecs such as FLAC or ALAC. Other people still might use lossy codecs like MP3 or AAC/ You can choose a codec whlie ripping music from CD depending on your needs for quality versus file size.
Yes, I still burn my movies to DVD. I especially love having physical copies of my favorite films, it somehow adds to the whole movie watching experience. If your are looking for a reliable DVD authoring software, I recommend DVDFab DVD Creator. Hope this tool can help you.
Maybe you can try DVDFab DVD Copy, which may recognize your corrupted DVDs and make a backup copy of it. This tool is good at decrypting and coping old DVD.
I usually use HanBrake, MakeMKV, or DVDFab to copy bluray disc.