No, I've not encountered any visual problems with ffmpeg2. But, it often gives a lot of warning messages, even on new DVDs which I don't believe are *that* broken. mpeg12 works for me and doesn't spew such messages so I use it. I had one time a problem with ffmpeg2 where somehow it managed to desync the audio/video (which I find very strange O.o). I then encoded the DVD ISO again with the exact same settings, except this time forcing mpeg12 as decoder and the encoding came out flawless