I've been using MP4 fast for conversions of wtv with 1280 set as the width. I've just noticed that some files convert to 1280x720 and others convert to 1280x704.
All the conversions play well but I'm curious as to what causes. The shows were likely recorded from different US channels and using different tuners. I can probably go back and link the conversions to a given channel (network) but I don't know if there is any way to determine which tuner was used.
Wayne