--- /dev/null
+--- ffmpeg-4.4/libavcodec/libdav1d.c 2021-04-09 00:28:39.000000000 +0300
++++ ffmpeg-4.4/libavcodec/libdav1d.c 2022-03-27 15:54:53.212041349 +0300
+@@ -33,6 +33,9 @@
+ #include "decode.h"
+ #include "internal.h"
+
++#define FF_DAV1D_VERSION_AT_LEAST(x,y) \
++ (DAV1D_API_VERSION_MAJOR > (x) || DAV1D_API_VERSION_MAJOR == (x) && DAV1D_API_VERSION_MINOR >= (y))
++
+ typedef struct Libdav1dContext {
+ AVClass *class;
+ Dav1dContext *c;
+@@ -145,6 +148,15 @@
+ if (dav1d->operating_point >= 0)
+ s.operating_point = dav1d->operating_point;
+
++#if FF_DAV1D_VERSION_AT_LEAST(6,0)
++ if (dav1d->frame_threads || dav1d->tile_threads)
++ s.n_threads = FFMAX(dav1d->frame_threads, dav1d->tile_threads);
++ else
++ s.n_threads = FFMIN(threads, DAV1D_MAX_THREADS);
++ s.max_frame_delay = (c->flags & AV_CODEC_FLAG_LOW_DELAY) ? 1 : s.n_threads;
++ av_log(c, AV_LOG_DEBUG, "Using %d threads, %d max_frame_delay\n",
++ s.n_threads, s.max_frame_delay);
++#else
+ s.n_tile_threads = dav1d->tile_threads
+ ? dav1d->tile_threads
+ : FFMIN(floor(sqrt(threads)), DAV1D_MAX_TILE_THREADS);
+@@ -153,6 +165,7 @@
+ : FFMIN(ceil(threads / s.n_tile_threads), DAV1D_MAX_FRAME_THREADS);
+ av_log(c, AV_LOG_DEBUG, "Using %d frame threads, %d tile threads\n",
+ s.n_frame_threads, s.n_tile_threads);
++#endif
+
+ res = dav1d_open(&dav1d->c, &s);
+ if (res < 0)
+@@ -185,6 +198,9 @@
+ Libdav1dContext *dav1d = c->priv_data;
+ Dav1dData *data = &dav1d->data;
+ Dav1dPicture pic = { 0 }, *p = &pic;
++#if FF_DAV1D_VERSION_AT_LEAST(5,1)
++ enum Dav1dEventFlags event_flags = 0;
++#endif
+ int res;
+
+ if (!data->sz) {
+@@ -456,11 +472,18 @@
+ return 0;
+ }
+
++#ifndef DAV1D_MAX_FRAME_THREADS
++#define DAV1D_MAX_FRAME_THREADS DAV1D_MAX_THREADS
++#endif
++#ifndef DAV1D_MAX_TILE_THREADS
++#define DAV1D_MAX_TILE_THREADS DAV1D_MAX_THREADS
++#endif
++
+ #define OFFSET(x) offsetof(Libdav1dContext, x)
+ #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
+ static const AVOption libdav1d_options[] = {
+- { "tilethreads", "Tile threads", OFFSET(tile_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_TILE_THREADS, VD },
+- { "framethreads", "Frame threads", OFFSET(frame_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_FRAME_THREADS, VD },
++ { "tilethreads", "Tile threads", OFFSET(tile_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_TILE_THREADS, VD | AV_OPT_FLAG_DEPRECATED },
++ { "framethreads", "Frame threads", OFFSET(frame_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_FRAME_THREADS, VD | AV_OPT_FLAG_DEPRECATED },
+ { "filmgrain", "Apply Film Grain", OFFSET(apply_grain), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VD | AV_OPT_FLAG_DEPRECATED },
+ { "oppoint", "Select an operating point of the scalable bitstream", OFFSET(operating_point), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 31, VD },
+ { "alllayers", "Output all spatial layers", OFFSET(all_layers), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },