I have around fifty Video8 and Hi8 90 minute tapes that I'm about to edit and export to either or both MP4 files or DVDs. I imported the tapes a while ago using Pinnacle Studio, and they're in AVI format (possibly DV-AVI format). I'm at a loss as to whether I should convert the AVI files to MP4 before I start editing them, or whether it's better to leave them as is and only convert to MP4 during export. Preliminary experimentation indicates that around 50 AVI clips strung together slow the PC down considerably. A further puzzle: when are MXV files of use? Seeing they inevitably involve an additional intermediate conversion is there any real advantage to editing in this format? All advice much appreciated!