In general, one does not have to care about the size of media used in web-pages anymore, because the bandwidth is often adequate enough. And yes JPEG images appear faster when smaller, but then the images would be of lesser quality.
For video the user knows and expects and accepts that there are more bytes involved, so
you determine the quality. If you want more you go for more pixels and... for larger source files.
Look at what Youtube is doing, it offers various qualities sometimes even in a range from 144p to 2160p (4k). The user selects quality desired, (maybe) on the bandwith available.
The creator of such videos always submits the highest and Youtube converts downwards to the range. I am sure that the creator would use images of the largest size he has available.
Hope that this helps.
o, and btw: if you go for 1920x1080 and use smaller jpeg files, the quality of the video would be less, but still with the size of a 1920x1080 video...
This message was edited 1 time. Last update was at Jan 26. 2020 07:44