---
doc/general.texi | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/doc/general.texi b/doc/general.texi
index 9fa79f5..a056704 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -112,6 +112,44 @@ Go to @url{https://github.com/dekkers/libilbc} and follow
the instructions for
installing the library. Then pass @code{--enable-libilbc} to configure to
enable it.
+@section AviSynth
+
+Libav can read AviSynth scripts as input.
+
+For Windows, the avisynth_c.h header needed for this support is the variant
+provided by x264's source code in its extras/ directory, or provided with a
+Makefile at @url{https://github.com/qyot27/avisynth_headers} (which is a
+temporary repository). The reason for this is because the copy provided
+in classic AviSynth's CVS repository has not been updated to support
+AviSynth 2.6. AviSynth 2.5 is not supported by Libav.
+
+For Linux and OSX, AvxSynth is used to provide this support. avxsynth_c.h is
+installed as part of the normal build routine, as illustrated on AvxSynth's
+wiki: @url{https://github.com/avxsynth/avxsynth/wiki/System-Setup} (the
+instructions for compiling its prerequisites are outdated, as FFMS 2.18 or
+higher is now needed; the list of dependencies to be downloaded from the
+repositories is still the same, though).
+
+Pass @code{--enable-avisynth} to configure to enable the support.
+
+Supported versions (Windows):
+AviSynth 2.6 (@url{http://avisynth.nl}, current version = alpha 5)
+AviSynth+ 0.1 (@url{http://avs-plus.net})
+
+Supported versions (Linux and OSX):
+AvxSynth (@url{https://github.com/avxsynth/avxsynth})
+
+@float NOTE
+AviSynth and AvxSynth are loaded dynamically. Distributors can build Libav
+with @code{--enable-avisynth}, and the binaries will work regardless of the
+end user having AviSynth or AvxSynth installed - they'll only need to be
+installed to use AviSynth scripts (obviously).
+
+For 64-bit builds of Libav on Windows, the only version that can be used
+is AviSynth+, since classic AviSynth doesn't support 64-bit.
+@end float
+
+
@chapter Supported File Formats and Codecs
--
1.8.3.2
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