@code{--enable-avisynth} to configure to enable AviSynth support.
For Windows, supported AviSynth variants are
-@url{http://avisynth.nl, AviSynth 2.6} for 32-bit builds and
-@url{http://avs-plus.net, AviSynth+ 0.1} for 32-bit and 64-bit builds.
+@url{http://avisynth.nl, AviSynth 2.6 RC1 or higher} for 32-bit builds and
+@url{http://avs-plus.net, AviSynth+ r1718 or higher} for 32-bit and 64-bit builds.
@url{https://github.com/AviSynth/AviSynthPlus, AviSynth+'s git repository}
provides a GNU-style Makefile which can install just the headers using
@code{make install PREFIX=/install/prefix}.
avs->vi = avs_library.avs_get_video_info(avs->clip);
#ifdef USING_AVISYNTH
- /* libav only supports AviSynth 2.6 on Windows. Since AvxSynth
- * identifies itself as interface version 3 like 2.5.8, this
- * needs to be special-cased. */
+ /* On Windows, libav supports AviSynth interface version 6 or higher.
+ * This includes AviSynth 2.6 RC1 or higher, and AviSynth+ r1718 or higher,
+ * and excludes 2.5 and the 2.6 alphas. Since AvxSynth identifies itself
+ * as interface version 3 like 2.5.8, this needs to be special-cased. */
- if (avs_library.avs_get_version(avs->clip) == 3) {
+ if (avs_library.avs_get_version(avs->clip) < 6) {
av_log(s, AV_LOG_ERROR,
- "AviSynth 2.5.8 not supported. Please upgrade to 2.6.\n");
+ "AviSynth version is too old. Please upgrade to either AviSynth 2.6 >= RC1 or AviSynth+ >= r1718.\n");
ret = AVERROR_UNKNOWN;
goto fail;
}