I have some legacy code that was written against an old version of ffmpeg
and I need to update it to use the latest API's. There is some code that
does cropping that currently looks like this:
ImgReSampleContext* r_context = img_resample_full_init
(dst_width, dst_height, src_linesize, src_height,
crop.top, crop.bottom, crop.left, crop.right, 0, 0, 0,
0);
img_resample(r_context, (AVPicture*)&dst_picture,
(AVPicture*)dst_frame);
img_resample_close(r_context);
where "crop" is just a struct containing the number of pixels to crop off
on each of the four sides of the original image. Looking over the ffmpeg
release history, ImgReSampleContext and img_resample were deprecated and
then removed, with the comment in the intermediate source code to "use
sws_scale instead." I have looked at sws_scale but don't see an easy way
to do what the above code does -- seems like the "slice" parameters let you
crop vertically, but not horizonatly. Anyone know the answer to this? Do
I need to use libavfilter?
--Marc
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