video bitrate according size window and 2nd "calc bouto

[Donald]

Hi,

I have some question about the video bitrate and the size of the window. The second button says to us which bitrate is going to be in equivalence with the size of used window. In this way, we can know that "977" is the good bitrate to use with a window to 640 x 272 (2:35, crop). The more the size of window is small, the more we realize that the ideal bitrate is low (logic). So, we realize that in 640 x 272 we can make like 88 minutes of film by keeping(guarding) a bitrate "considered" as check (in green), and that 109 minutes of film can like on 709 Mo if we use a window of 560 x 240. We are tried to think that to make hold more than minute of film it is necessary to lower the size of the window because the ideal bitrate will be less raised (brought up). Questions:

- Is it better to use a too low bitrate (in red) with a size of window in 640 x 272 rather than a correct bitrate (in green) with a smaller window (560 x 240)?

- Is a window of 560 x 240 too small to have a good quality in full screen? In brief, what is the limit not to be exceeded?

[major]

- Is it better to use a too low bitrate (in red) with a size of window in 640 x 272 rather than a correct bitrate (in green) with a smaller window (560 x 240)?

This depends on the movie. Complex movies will have too many artifacts with a "red" bitrate, though "talking heads" could look good.

- Is a window of 560 x 240 too small to have a good quality in full screen? In brief, what is the limit not to be exceeded?

The best choice should not be lower than the the source movie size and not higher than the playback device screen size.

There is no point in using a bigger size than the source, though using a lower size will always result in lower quality.

About the playback device, a NTSC TV screen height is 480 pixels (576 for PAL). Such image with an aspect ratio of 4:3 and square pixels (ie computer screen) will have 640x480 pixels (768x576 for PAL). When playing 2.35:1 material, the height will be 272 for NTSC and 320 for PAL. So for a rough comparison, lower vertical resolutions will look worse than a TV image.