[FFmpeg-user] How to duplicate 1st line

[Paul B Mahol]

On 1/6/19, Ulf Zibis <Ulf.Zibis at gmx.de> wrote:
> Hi,
>
> because of a noise in the 1st line of my video, I want to duplicate the
> 2nd line to the first. I tried this and got an error about invalid
> horizontal crop value:
> ffmpeg -i in.vob -vf
> "split[in1][in2];[in1]crop=in_w:1:0:1[top];[in2]crop=in_w:in_h-1:0:1[main];[top][main]
> vstack"out_fill-top_.mp4
>
> I guess, the problem is, that the input file is interlaced. So I tried
> the following:
> ffmpeg -i in.vob -vf
> "split[in1][in2];[in1]crop=in_w:2:0:2[top];[in2]crop=in_w:in_h-2:0:2[main];[top][main]
> vstack"out_fill-top_.mp4
> This works, but results in visible artefacts in the first 2 lines.
>
> Because the resulting mp4 video is progressive anyway, how could I get
> what I want (only 1 line should be duplicated)?
>
>
> Thanks
> -Ulf
>
> --
> Von meinem Seibert gesendet
>
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