Pixels on Personal computer monitors are frequently sq., but pixels used in digital video typically have non-square aspect ratios, for instance those Utilized in the PAL and NTSC variants from the CCIR 601 digital video conventional, plus the corresponding anamorphic widescreen formats. To show subtitles/captions in addition to your video, https://www.youtube.com/watch?v=jfBrROL69Lk