mp4 aspect subtitles

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    MP4 playback - aspect ratio?

    I have a bunch of MP4 videos which my HDR-Fox will happily play, but not in the correct aspect ratio - old 4:3 ones are stretched to fill the screen, as are files wider than 16:9. They play correctly (with black bars at the sides or top/bottom respectively) when served by the Humax to a Roku...