Quote:
Originally Posted by whogoesthere
some use 720p because its believed to be better for sports programming...
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That's only because they are using too low a bitrate for the 1080, use a OTA antenna on your local channels to see what you are missing. You can see this on regular programming as well, if there is flashing or a lot of action. Another place you'll see it is on dark sky scenes.
You can use different bitrates for compressed video. The resolution, codec, content and bandwidth(or file) limitations are all considerations. For example with 720*480 DVD that uses MPEG2 the sweet spot is 6000kbps. You may want to go up to 8000kbps if you have a lot of action or if it's homemade video which is typically very noisy and has a lot of movement, anything higher typically does not give you any benefit and just creates a larger file.
On the low end 4000kbps is about the limit and you will have noticeable loss in quality especially during action scenes. If you want or need to go lower you are better off lowering the resolution so it has sufficient bitrate which is what the cable company is doing. You lose detail over video with sufficient bitrate but that doesn't matter since it can't be properly rendered anyway.