Is DGIndex accurate with it's delay value?
 

When i demux the video and audio of a DVD using DGIndex, the demuxed audio file usually says at the end 'DELAY 72ms' So then i deinterlace the video and apply some filters, render, then remux the video with the audio, though i do this using ffmpeg. Is using '-offset 0.072' correct? Now i just check to see if the audio is correct by importing the original VOB file, then dragging this rendered file into the timeline, so they both play at the same time, but there appears to be some slight reverb, indicating it's still ms out of sync?

reverb ?? You mean delay (out of sync , right ?)

it's very accurate according to my experience so i have no clue, wait for more answers

Well yes the reverb/echo would indicate it might be slightly out of sync. Also i heard that ffmpeg -offset doesn't support negative values. Is that right?