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

[Arpi]

Hi,

> Ok, I am feeling dumb now:
> 
> I tried to encode an 29.76 DVD (Slayers Next), used -ofps 23.976 and got
> those dreaded "duplicate 1 frame(s)" messages. After _not_ using -ofps
> 23.976 the messages did not occur.
> 
> So, this DVD is _not_ inverse telecined and contains 29.976 fps of
> *real* frames?

yes. it was probably digitalized from ntsc video, not from 24fps cinema
film and telecined to get ntsc rate.

someone asked how and where does mplayer the inverse telecine stuff.
it doesn't really do any special thing. telecined video means somehow
variable framerate (actually variable frame display time), and it just
ignore this time and ise 1.0/ofps value if -ofps is ised.
as real telecined videos come from 24fps movies (for ntsc, they are slowed
down by 0.1% to get 29.97 instead of 30fps telecined) and the stream
actually contains only 24 frames per second, if i ignore telecine's
frametimes, i just get constant 24fps stream.

and for the original topic:
29.97 fps does mean NTSC rate, and does not mean telecined video. it is maybe
telecined maybe real 29.97 fps.
i've even seen 29.97 fps video (not really) telecined from 25fps source (pal).
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.
(maybe some minfo program)


A'rpi / Astral & ESP-team

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