These recomendations are not absolute. Earlier I`ve tuned DivX 4.12
codec better, than it`s standart settings. XviD standart settings are
better `tuned`, but some trivial changes MUST be done to get better
result for some appropriate videomaterial.
I work with VCD/DVD original, NOT with VHS/TV sources.
Maximum keyframe interval
Maximum keyframe interval: 300 change to what you want.
I set 10000.
This minimizes number of keyrames to `only-scene-changes`.
Default forced keyframes per 10 sec (300 default settings) makes less bitrate
for other part of stream. Difference may be measured in quantizer levels
viewing analyse.log. You may gain even 2 quantizer levels.
But large keyframe interval make inconvinient travelling over time axis
in any player. :-(
So - if you prefer to choose position smoothly - make this number less.
I prefer to see film as normal film - from beginning to the end.
Settings I am using in MOST films` encoding are:
pass-independent Profile @ Level setting:
DO NOT turn ON options "QPel" and "Global Motion Compensation"!
these two options cause incompatibilities with many hardware players
pass-independent Advanced Options setting:
1st pass setting:
2nd pass setting:
Statistic of the result
When Xvid makes second pass, it draws Quantizer histogramm.
I`ve found some empiric rule FOR LOW BITRATES (<0.2bpp).
"Nice histogramm means nice picture".
Nice histogramm means the most `smooth` Gaussian Curve of P-frames
and B-Frames. And peaks of the curves must be in arythmetical progress.
2-4-6, 2-5-8 for example.