Thanks very much for read my topic.
I wait convert some video files for archiver and playback having maximum compression quality not losing quality.
Not bluray or HD 2k 4k videos or etc.
I not see any option in converter or same any calculator tool to see what the best compression settings for videos types below.

Some files are in DivX and Xvid and few being H264 AVC.
I want understand :
- what are the best bitrate values for good and very good quality convertion.
- CBR or VBR ?
- CABAC does better compression and lose quality ?

The files details are below. I not wait change resolution. Only convert to H.264.
Videos not have fast scenes moving and some are 24 and others 30 FPS.
Perhaps changing from 30 to 24 fps not has any visible lose in playback ?

DivX
512X288 890 kb/s 24 FPS Audio MP3 74 kb/s 48 khz 2 channels
720X480 1200 kb/s 30 FPS Audio MP3 128 kb/s 44 khz 2 channels

Xvid
512X384 847 kb/s 30 FPS Audio MP3 128 kb/s 48 khz 2 channels
640X480 B&W 958 kb/s 30 FPS Audio MP3 128 kb/s 44 khz 2 channels
640X480 844 kb/s 30 FPS Audio MP3 128 kb/s 44 khz 2 channels
720X544 2218 kb/s 30 FPS Audio MP3 128 kb/s 48 khz 2 channels

I also wait to convert from H.264 to H.264 to optimize file size not losing quality.
Converting from H.264 to H.264 lose quality in each convert ?

H264
320X240 212 kb/s 30 FPS Audio MP3 128 kb/s 44 khz 2 channels
320X240 using CABAC 299 kb/s 30 FPS Audio MP3 128 kb/s 44 khz 2 channels
420X320 268kbps FPS Audio AAC 95 kb/s 44 khz 2 channels
640 x 480 1842 kb/s 30 FPS Audio AAC 128 kb/s 48 khz 2 channels
1280X544 963 kb/s 24 FPS Audio AAC 120 48 khz 2 channels

AVC
480X360 551 kb/s 29 FPS AAC 96 kb/s 48 khz 2 channels
640X480 CABAC 616 551 kb/s 24 FPS MP3 128 kb/s 48 khz 2 channels
1805 551 kb/s 24 FPS AAC 128 kb/s 48 khz 2 channels
1999 551 kb/s 30 FPS AAC 128 kb/s 48 khz 2 channels
870 551 kb/s 24 FPS MP3 128 kb/s 48 khz 2 channels
1440X1080 CABAC 3674 551 kb/s 25 FPS MP3 320 kb/s 48 khz 2 channels
4022 551 kb/s 30 FPS 256 kb/s 44 khz 2 channels

Thanks very much for your reply.
Have an nice week.