Τα SD παιζουν σε 720χ576 τα HD εχουν μεσο ορο τα 5Mbs .
και κατι πολυ σημαντικο τα 720p ειναι ανωτερα απο τα 1080i και αναλυετε παρακατω (ΔΕΝ ΜΙΛΑΜΕ ΓΙΑ ΤΑ 1080p!)
https://www.lifewire.com/difference-between-720p-and-1080i-1847334
720p and 1080i are both high definition video resolution formats, but that is where the similarity ends. There are significant differences between the two that may affect the TV you buy and your TV viewing experience.
720p is 1,280 pixels displayed across a screen horizontally and 720 pixels displayed down the screen vertically. This yields 720 horizontal lines or pixel rows that are sent to a TV or other display device progressively, or each line sent following another (that is where the "p" comes from). The entire image (720 lines or pixel rows) is sent every 60th of a second (or twice every 30th of a second). The total number of pixels displayed on the entire 720p screen surface is 921,600 (slightly less than 1 megapixel in digital camera terms).
1080i represents 1,920 pixels arranged horizontally and 1,080 pixels arranged vertically. This yields 1,080 horizontal lines (pixel rows), sent to a TV alternately (referred to as an interlaced signal). In other words, all the odd lines or pixel rows are sent to the TV first, followed by all the even lines or pixel rows.This means that 1080i, since it is interlaced, only sends 540 lines (or half the detail) every 60th of a second, with all the detail sent every 30th of a second. On the surface, 1080i produces more detail than 720p, but since the increased detail is only sent every 1/30th of a second, rather than 1/60th of a second, fast moving objects will exhibit slight interlacing artifacts - which can appear to look like jagged edges or a slightly blurred effect.
επισης παρακατω ειναι ανα συχνοτητα τα καναλια και ο ρυθμος μεταδοσης για το καθενα
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