[MPlayer-users] Re: 2 questions about 2-Pass DivX encoding with mencoder

[Arpi]

Hi,

> > it's not easy to detect (it soulhd be possible counting coded frames
> > for 10 seconds) and it's not the job of mencoder imho.
> 
> Hmm.
> 
> If I am right, telecined MPEGs contain only 24fps, but some frames have
> an "duplicate me!!!1" flag set.

it's a bit much mroe difficult. there are 4 flags a various headers together
giving some field/frame display time. but in theory, yes, it's possible to
detect different behaviour of this flags and detect fake rate (they are
not really duplicated, just delayed by half frame/field time).

> So, if one encounters an MPEG, which wants to be played at 30fps, but
> does _not_ contain those flags, we have a "real" NTSC MPEG.
yes. but not "real" ntsc's can be 24 fps, 15 fps, 25 fps or really variabel
fps mpegs... for proper detection, you should count frames for a few
seconds, and decide his it constant rate, converted rate (constant ratio,
like 2:2 : 3:2 at telecine) or variable rate.

> Or what am I missing here?
RTFM :)


A'rpi / Astral & ESP-team

--
mailto:arpi at thot.banki.hu
http://esp-team.scene.hu