[Libav-user] Swscale: Interlaced 4:2:2 to interlaced 4:2:0

Alex Cohn alexcohn at netvision.net.il
Thu May 24 16:38:18 CEST 2012

On Thu, May 24, 2012 at 11:19 AM, Carl Lindqvist <lulebo at gmail.com> wrote:
> Yes, my input is raw SDI video. Interlaced SD 4:2:2 8bit (or 10bit, but I
> use 8bit). I want the output to be interlaced, full field rade. Right now,
> swscale produces chroma samples that are scaled from both fields, which give
> the effect in the image in the stack overflow thread when looking at the
> final video.
> I have been reading what I can find about swscale, but can't really find any
> info on this. This is the code I use (just standard stuff):
> img_convert_ctx = sws_getContext(destWidth, destHeight,
>                                                  PIX_FMT_UYVY422,
>                                                  c->width, c->height,
>                                                  c->pix_fmt,
>                                                  sws_flags, NULL, NULL,
> NULL);
> sws_scale(img_convert_ctx, tmp_picture->data, tmp_picture->linesize,
>                       0, destHeight, picture->data, picture->linesize);

What are the input and output sizes in your case?

> Is there a flag that sets this? There are some flags like
> SWS_FULL_CHR_H_INP, but I can't find any info on what they do.
> Regards
> Carl Lindqvist


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