Hi. Recently tried to convert a TV series from MKV to MP4 with AVC. My new Bravia wouldn't play the MKV file (probably because the recorder is a tad old). Conversion was fine but when watching on TV the subtitles were so small I couldn't read them. I've searched and can't find a button that says " maintain relative size for subtitles", or something like that. Is this something I need to do with the AVC program or with the TV? The Bravia is 55 inch. Appreciate any help. John