diff --git a/libavformat/avisynth.c b/libavformat/avisynth.c
index fbd4a8d4b0..ac3247a6ce 100644
--- a/libavformat/avisynth.c
+++ b/libavformat/avisynth.c
@@ -65,6 +65,17 @@ typedef struct AviSynthLibrary {
     AVSC_DECLARE_FUNC(avs_release_value);
     AVSC_DECLARE_FUNC(avs_release_video_frame);
     AVSC_DECLARE_FUNC(avs_take_clip);
+#ifdef USING_AVISYNTH
+    AVSC_DECLARE_FUNC(avs_bits_per_pixel);
+    AVSC_DECLARE_FUNC(avs_get_height_p);
+    AVSC_DECLARE_FUNC(avs_get_pitch_p);
+    AVSC_DECLARE_FUNC(avs_get_read_ptr_p);
+    AVSC_DECLARE_FUNC(avs_get_row_size_p);
+    AVSC_DECLARE_FUNC(avs_is_yv24);
+    AVSC_DECLARE_FUNC(avs_is_yv16);
+    AVSC_DECLARE_FUNC(avs_is_yv411);
+    AVSC_DECLARE_FUNC(avs_is_y8);
+#endif
 #undef AVSC_DECLARE_FUNC
 } AviSynthLibrary;
 
@@ -128,6 +139,17 @@ static av_cold int avisynth_load_library(void)
     LOAD_AVS_FUNC(avs_release_value, 0);
     LOAD_AVS_FUNC(avs_release_video_frame, 0);
     LOAD_AVS_FUNC(avs_take_clip, 0);
+#ifdef USING_AVISYNTH
+    LOAD_AVS_FUNC(avs_bits_per_pixel, 0);
+    LOAD_AVS_FUNC(avs_get_height_p, 0);
+    LOAD_AVS_FUNC(avs_get_pitch_p, 0);
+    LOAD_AVS_FUNC(avs_get_read_ptr_p, 0);
+    LOAD_AVS_FUNC(avs_get_row_size_p, 0);
+    LOAD_AVS_FUNC(avs_is_yv24, 0);
+    LOAD_AVS_FUNC(avs_is_yv16, 0);
+    LOAD_AVS_FUNC(avs_is_yv411, 0);
+    LOAD_AVS_FUNC(avs_is_y8, 0);
+#endif
 #undef LOAD_AVS_FUNC
 
     atexit(avisynth_atexit_handler);
@@ -438,17 +460,19 @@ static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
      * Since AvxSynth doesn't have these functions, special-case
      * it in order to avoid implicit declaration errors. */
 
-    if (avs_is_yv24(avs->vi))
+    if (avs_library.avs_is_yv24(avs->vi))
         bits = 24;
-    else if (avs_is_yv16(avs->vi))
+    else if (avs_library.avs_is_yv16(avs->vi))
         bits = 16;
-    else if (avs_is_yv411(avs->vi))
+    else if (avs_library.avs_is_yv411(avs->vi))
         bits = 12;
-    else if (avs_is_y8(avs->vi))
+    else if (avs_library.avs_is_y8(avs->vi))
         bits = 8;
     else
+        bits = avs_library.avs_bits_per_pixel(avs->vi);
+#else
+    bits = avs_bits_per_pixel(avs->vi);
 #endif
-        bits = avs_bits_per_pixel(avs->vi);
 
     /* Without the cast to int64_t, calculation overflows at about 9k x 9k
      * resolution. */
@@ -477,18 +501,21 @@ static int avisynth_read_packet_video(AVFormatContext *s, AVPacket *pkt,
     dst_p = pkt->data;
     for (i = 0; i < avs->n_planes; i++) {
         plane = avs->planes[i];
-        src_p = avs_get_read_ptr_p(frame, plane);
-        pitch = avs_get_pitch_p(frame, plane);
-
 #ifdef USING_AVISYNTH
+        src_p = avs_library.avs_get_read_ptr_p(frame, plane);
+        pitch = avs_library.avs_get_pitch_p(frame, plane);
+
         if (avs_library.avs_get_version(avs->clip) == 3) {
             rowsize     = avs_get_row_size_p_25(frame, plane);
             planeheight = avs_get_height_p_25(frame, plane);
         } else {
-            rowsize     = avs_get_row_size_p(frame, plane);
-            planeheight = avs_get_height_p(frame, plane);
+            rowsize     = avs_library.avs_get_row_size_p(frame, plane);
+            planeheight = avs_library.avs_get_height_p(frame, plane);
         }
 #else
+        src_p = avs_get_read_ptr_p(frame, plane);
+        pitch = avs_get_pitch_p(frame, plane);
+
         rowsize     = avs_get_row_size_p(frame, plane);
         planeheight = avs_get_height_p(frame, plane);
 #endif