Someone opened an issue https://github.com/intel/libxcam/issues/729  they want 
to use a FFmpeg video filter pipeline to do multiple decoder, stitching and 
encoder.

Those 3rd party libs are not necessary for stitching and most image processing 
functions. By default these 3rd libs are disabled.

-----Original Message-----
From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of 
myp...@gmail.com
Sent: Thursday, July 30, 2020 5:34 PM
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH] avfilter/vf_xcam: add xcam video filter

On Thu, Jul 30, 2020 at 5:15 PM myp...@gmail.com <myp...@gmail.com> wrote:
>
> On Thu, Jul 30, 2020 at 5:12 PM Nicolas George <geo...@nsup.org> wrote:
> >
> > zongwave (12020-07-31):
> > > From: Yinhang Liu <yinhangx....@intel.com>
> > >
> > > xcam filter is a wrapper of libxcam project which supports 360 
> > > video stitching, automotive surround view stitching, digital video 
> > > stabilization (DVS), Wide dynamic range (WDR), wavelet noise reduction, 
> > > 3D noise reduction, etc.
> >
> > Hi. Thanks for the patch. But it seems to have been generated in a 
> > strange way, with double insertion marks. Did you commit your 
> > changes and then use git format-patch or git send-email?
> >
> > Regards,
> >
> > --
> >   Nicolas George
>
> The other thing is, I found libxcam (https://github.com/intel/libxcam)
> depend on a lot of 3rd libs
> "
> If --enable-gst, need install libgstreamer1.0-dev, 
> libgstreamer-plugins-base1.0-dev If --enable-aiq, need get ia_imaging 
> lib which we don't support If --enable-libcl, need compile or install 
> OpenCL driver If --enable-opencv, suggest OpenCV versions [3.0.0 - 
> 4.0.0) (or: OpenCV Wiki) If --enable-render, need compile 
> OpenSceneGraph library with configure option 
> "-DOSG_WINDOWING_SYSTEM=X11"
> If --enable-gles, need to install Mesa3D library If --enable-vulkan, 
> need to install Mesa3D library If --enable-avx512, need to install GCC 
> version > 4.9 ( CPUs With
> AVX-512 required)
> If --enable-dnn, need to compile OpenVino inference-engine If 
> --enable-json, need to install json.hpp "
> Is it a good idea to wrap a lib like this in AVFilter?

My confusion is, where is the boundary of FFmpeg?
in my personal opinion, libxcam is not a self-contained library.
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