[FFmpeg-user] ntsc-dvd doesn't default to interlaced.

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of Andy Civil
> Sent: 28 July 2013 03:57
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] ntsc-dvd doesn't default to interlaced.
> 
> On 2013-07-27 9:16 PM, Mike Brown wrote:
> > On Sat, Jul 27, 2013 at 05:09:33PM -0400, Andy Civil wrote:
> >> The way I'm analysing my output, is that I view it in VLC. What
> >> should happen is that I see the 'comb' effect on any moving edges,
> >> but if I choose to turn de-interlacing on, that comb effect disappears.
> >
> > With interlaced video, you better see the "comb" effect with motion
video.
> > But, there is fine print: 1) if the source was from pure interlaced
> > video, i.e., a live event; 2) the source is 2:3 pulldown video, where
> > 3 frames will not have the effect and 2 frames will.
> >
> > You won't have the effect if the source video was progressive.  You
> > might not get the effect if converting 25 fps source to 29.97 fps.
> > The 25 fps source might be progressive in nature (Doctor Who for
> > example).  It depends on how the conversion to 29.97 fps is done and if
> told to do interlaced.
> 
> The video starts from my Sony HX5 as 1920 x 1080 x 30i. It's then
deinterlaced
> by a commercial video editor to 1920 x 1080 x 60p. Every frame is
different.

In that case (converting HD to SD), you may want to consider converting from
BT.709 to BT.601 colour primaries (as earlier suggested by Andy Furniss).
The effect is subtle; it's a matter of how "perfectly" you want to do
things.

> --
> Andy
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