[MPlayer-users] Re: Newbie problems starting mencoder

D Richard Felker III dalias at aerifal.cx
Thu Sep 25 17:53:07 CEST 2003

On Thu, Sep 25, 2003 at 04:30:38AM -0500, Jonathan Rogers wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> D Richard Felker III wrote:
> >Using -vf detc=dr=1 or -vf ivtc=1 with tv cam content (interlaced 50
> >or 60 fps) will drop at least 1 out of every 5 "frames" (actually
> >field pairs since frames don't exist), and additionally try to make
> >progressive frames by rematching fields with less difference between
> >them, which will reorder (and thus misorder) fields! So it's a very
> >bad idea. Before selecting whether to encode as-is, deinterlace, or
> >reverse telecine, you must be sure you know what kind of content
> >you're dealing with! Actually the new vf_pullup can deal with mixed
> >progressive/pulldown content properly, but it still could be a bad
> >idea with true interlaced video...
> >
> Of course it's bad to use detc or ivtc with interlaced video. That's why 
> I said, "Specifically, one should only deinterlace TV sources." I went 
> on to recommend using detc or ivtc *for film sources*. Please try to 
> read a post before you go off on it. You wonder why I've gotten so angry 
> at you before.

Sorry, I did misread.


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