[MPlayer-users] mencoder, file sizes

[Sven Hartge]

Um 03:03 Uhr am 12.11.01 schrieb Felix Buenemann:

>>  It seems there is some corelation between source quality and compression
>> - when source is very good I get big gains on filesize, when it's ok there
>> is no noticable gain, and when source movie quality is poor, then divx4
>> gets bigger.

> yes, the cleaner the input video the better it can be compressed, compression
> artefacts in input video are unhealthy to encoders.

Right, I experience this right now, while tinkering with my TV-card. Since
Old-fashioned TV uses interlacing, faster moving objects or panning causes
the picture to look like a comb.

This compresses so bad, even a 2000kbps stream (divx4,384x288) looks
really really ugly, whereas the same sequence from a clean source (ie no
interlace combs) contains _no_ noticable artifacts when encoded at 900kbps
(divx4,384x288).

And this brings me to another subject, but I'll mention this in a seperate
eMail to reduce mixing threads.

S!