This is a new error I encountered. I was trying to encode a vob/ ifo file to mkv with x264 video, ac3 audio. 1] I created a d2v file for the vob and demuxed the Ac3 audio 2] Created an Avisynth script [.avs] file from this d2v file 3] Chose 'x264 DXVA HD - Balanced' setting & Mkv container for video 4] Chose 'Ac3 *Scratchpad*' setting for audio 5] Tried opening the Bitrate calculator and Megui gave me this error 6] So I changed audio to a different setting [not Ac3] and Bitrate calculator opened 7] Hypothesis is Bitrate calculator does not work when using Ac3 audio So how do I solve this problem? --- Btw I am following your guide on DVD to AVC with Megui