I'm having a load of difficulty syncing the audio to the video when I convert my Durarara from MKV to MP4. I've tried messing with the framerate and that did nothing for me, also mucked with the Audio Sample rate... also nothing.
>>1 avc free should fix it... just choose mp4 but please choose x264 for your codec! and mp3 at 128 for your audio! keep the aspect ratio to original other than that play the mkv with kmplayer or vlc player it worked fine for me.