Sigh - I know why I didn't become a teacher. I'm to rigid.
Free space - changes from day to day - minute to minute - so chance that it's the same is less than 1 / 1000.000
• Brand of DVD disk Used ? Matters due to that some are stable and some are notorious culprits as they work OK day 1 and fades away some weeks later.
• Type of DVD disk Used ? Hopefully same if spindle with DVDs is. DVD +/- RW are also a very bad choice as they work OK brand new - but ages quickly
• Burn speed - I set it to x2 or x4 - Much better - This goes also for brand new DVDs then the automatically set speed e.g. 16 can work - but after a few days setting down speed usually helps
• Material (Video-codec) same as previous ? (New Camera ?) - Can be if You are sure that You used exactly same Camera and setting and Audio from same source as Audio-CD (.aiff) - if from iTunes and .mp3 or even worse from PC and .vma - everything can go wrong.
So I don't ask to be mean - but to get a chance to be able to make a mindmapp to see better what might be problematic.
Yours - going to bed - Bengt W