The resolution is named after the width, 1080P resolution1920 *1080,720p resolution 1280*720, BD 1280 resolution 1280*720.

Although the resolution is theoretical, sometimes the real situation is different. Sometimes the resolution of 1080P is 1920*8 18.

Sometimes the resolution of 720P is 1280*544, because some videos have black edges on the top and bottom, so they still belong to 1080P and 720P.

Definition comparison is1080p > 720P & gtBD 1280

The first two are based on BD Blu-ray original disc conversion, but MKV format belongs to true BD. Although the last one is named BlueRay Disk(BD) 1280, it belongs to fake HD (fake BD), and it is generally in RMVB format, so it is relatively small in size.

True BD is generally 2-30G, of which 720P is generally 2- 10G, and 1080P is generally tens of grams; The fake BD is generally 1-2G.

If the resolution is 1366*768, it is unnecessary to download 1080P, which is a waste of space. 720P is enough, and BD 1280 is also ok. In fact, BD 1280 is only a little fuzzy than 720P.