is it just my old pc, or is anyone else having issues with a/v synching?
the file is fine, could be a number of things on your part. subpar hardware, faulty media player
software (matroska splitter, h.264 decoder, ac3 decoder filter, a/v presenter filter), other hardware
taxing software running at the same time, problem with soundcard or graphics card and their drivers,
problem with your cables (audio and monitor) or generally a problem with anything inbetween that's
getting the picture to your eyes and the sound to your ears.