how to build one plugin in meson

[Tim Müller]

> when i try to build gst-libav,  it says libavfilter not found
> 
> meson.build:18:0: ERROR:  Dependency "libavfilter" not found, tried
> pkgconfig
> 
> libavfilter should install as a part of libav which is inside 
> gst-libs/ext/libav/. no?

The meson build does not support using the ffmpeg snapshot contained in
the tarball. You need to build against an external ffmpeg version. Only
the autotools build supports the internal ffmpeg snapshot.

Cheers
 Tim

-- 
Tim Müller, Centricular Ltd - http://www.centricular.com