A/V sync

(DO NOT encode from STDIN !)

mencoder is made to fix A/V sync issues of the input file, but if that doesn't work (mostly when the original has a variable frame rate) you can use "-mc 0" (it sets the 'M'aximum 'C'orrection to 0). If you want to further guard against strange frame duplications and skips you can use "-mc 0 -noskip". This prevents all A/V sync and copies frames one-by-one so you can NOT use any filter that drops or duplicate frames or if the input has variable bitrate.