[FFmpeg-user] simple bob -- How?

[Paul B Mahol]

On Tue, Dec 29, 2020 at 10:50 AM Mark Filipak (ffmpeg) <markfilipak at bog.us>
wrote:

> On 12/29/2020 04:39 AM, Paul B Mahol wrote:
> > On Tue, Dec 29, 2020 at 10:32 AM Mark Filipak (ffmpeg) <
> markfilipak at bog.us>
> > wrote:
> >
> >> On 12/29/2020 04:09 AM, Mark Filipak (ffmpeg) wrote:
> >>> On 12/29/2020 04:04 AM, Paul B Mahol wrote:
> >>>> On Tue, Dec 29, 2020 at 9:56 AM Mark Filipak (ffmpeg) <
> >> markfilipak at bog.us>
> >>>> wrote:
> >>>>
> >>>>> On 12/29/2020 03:41 AM, Paul B Mahol wrote:
> >>>>>> On Tue, Dec 29, 2020 at 5:51 AM Mark Filipak (ffmpeg) <
> >>>>> markfilipak at bog.us>
> >>>>>> wrote:
> >>>>>>
> >>>>>>> I seek a way to do simple bob (i.e. repeat fields at 2xFPS) with no
> >>>>> other
> >>>>>>> filtering. Can you help me?
> >> -snip-
> >>>>>> After so much time you still struggle a lot, buy some GUI tools and
> be
> >>>>>> happy ever after.
> >>
> >> Here's what I've tried so far:
> >> -filter_complex
> >> "split[a][b],[a]separatefields[c],[b]separatefields[d],[c][d]join"
> >> -filter_complex
> >> "split[a][b],[a]separatefields[c],[b]separatefields[d],[c][d]interleave"
> >> -vf "separatefields,shuffleframes=0 0,weave"
> >> -vf separatefields,scale=720x480
> >> -vf separatefields,scale=w=iw:h=2*ih
> >> -filter_complex "split[a][b],[a]separatefields[c],[c][b]scale2ref"
> >>
> >
> > Do you want interlacer or deinterlacer? It is very unclear from your
> > subject what you need.
> >
> > Simple bob deinterlacer takes every single field and than interpolates
> > missing fields with bilinear interpolation iirc.
>
> I think that bob just separates fields (e.g. [720x480] ->
> [720x240][720x240]), then line doubles
> (e.g. [720x240][720x240] -> [720x480][720x480]). When it is played back,
> horizontal lines in the
> video appear to bob up and down (but at 60Hz, that's not very noticeable).
>

Try this filtergraph:

separatefields,split[a][b],[a][b]vstack,il=l=i:c=i


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