2012/5/24 Alex Cohn <[email protected]> > On Thu, May 24, 2012 at 11:19 AM, Carl Lindqvist <[email protected]> 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 > > BR > Alex > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user >
In this case the video is just standard SD video, 720x576 8bit uyvy. But I also have some 1080i video i would like to process in the same way. If I understand how to do one, I can probably figure out how to do the other one. I can probably do my own calculations and even optimize a bit with SSE, since I think I get how the chroma samples should behave, but it would be nice to have swscale do it for me if it is supported. Is it really necessary to have 2 instances, one for each field. It seems as if this would be a pretty common thing to want to do. I have not yet looked at MPlayer/libmpcodecs/vf_scale.c, will do it tomorrow and see what I can find. How does the ffmpeg app do it? What file should I look at for source examples? Regards Carl Lindqvist
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