[MEncoder-users] Encoding interlacing telecine and frame rate

[RC]

On Thu, 10 Aug 2006 17:38:39 +0100
Mikey <abc.mikey at googlemail.com> wrote:

> If it is 24000/1001 and stays like that then it is PAL and wont be
> interlaced or telecined.

PAL is exactly 25fps..  
NTSC (soft-telecined) film is ~24fps.
 
> If it is 60000/1001 and stays like that then it is NTSC and may be
> interlaced or telecined. 

NTSC is 30000/1001.  Though there are two fields in every frame.  

It's only if you split each field off into it's own frame (-vf tfields)
that you get 60000/1001.  Or with 720p HDTV broadcasts.

> What does detc do? I have seen it used but I couldn't find a
> description in the manual.

man mplayer
/detc

> There is some mention in the manual to detecting from the output of
> mplayer whether something was interlaced or telecined. Is this
> possible?

MPlayer output will tell you if it is soft telecined (~24fps) and if it
is also mixed with ~30fps (interlaced/progressive/hard telecined) video.

Detecting hard telecining is much more complex and time consuming.  And
detecting interlacing isn't currently possible (without some
mplayer modifications).