lavfi: replace filter_samples by filter_frame

Based on patch by Anton Khirnov
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/src_movie.c

@@ -577,7 +577,7 @@ static int movie_push_frame(AVFilterContext *ctx, unsigned out_id)
         ff_end_frame(outlink);
         break;
     case AVMEDIA_TYPE_AUDIO:
-        ff_filter_samples(outlink, buf);
+        ff_filter_frame(outlink, buf);
         break;
     }