Thank you for your answser! I'm going to try libavfilter. I saw it seems to provide a filter algorithm, so i guess libavfilter can replace libswscale? So what is the benefits to use libswcale instead of libavfilter?
On Wed, Feb 13, 2013 at 6:35 PM, Paul B Mahol <[email protected]> wrote: > On 2/13/13, Eric Beuque <[email protected]> wrote: > > Hi, > > > > I'm using avcodec and swcale to to display a MPJEG stream in a Qt > > application. > > > > avcodec decode image as YUV image and swscale rescale it in a RGB32 image > > to fit in the windows. > > > > I would like to provide a zoom feature, i so i am wondering if any way > > exists with swscale to rescale only the selected region. For example, I > got > > an original YUV image as 1280x800 pixels, the destination widget is > 640x480 > > pixels, but i want only to display the region [0,0] to [320,240]. > > > > Is swscale able to to that? I have some difficulties to understand all > > variables in the documentation. > > No, swscale is not supposed to do that. > > libavfilter have filters that do cropping, pading and etc... > Also its not hard to do it manually. > > > Thank for your help > > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user >
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