diff --git a/doc/APIchanges b/doc/APIchanges
index cedffbf428dcb8933267aa484547e70c89aa8ffc..5dca6b3e51d4c4acdf47aed6f0d66d75e3feffd0 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,10 @@ libavutil:     2015-08-28
 
 API changes, most recent first:
 
+2017-06-14 - xxxxxxx - lavu 55.66.100 - hwcontext.h
+  av_hwframe_ctx_create_derived() now takes some AV_HWFRAME_MAP_* combination
+  as its flags argument (which was previously unused).
+
 2017-06-14 - xxxxxxx - lavc 57.99.100 - avcodec.h
   Add AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH.
 
diff --git a/libavutil/hwcontext.c b/libavutil/hwcontext.c
index ed09c49f2d561d1aa5228678a2ce4f9c65294efc..5a2219471655e15666d356b00cdc5871906ac929 100644
--- a/libavutil/hwcontext.c
+++ b/libavutil/hwcontext.c
@@ -458,6 +458,11 @@ int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
         // and map the frame immediately.
         AVFrame *src_frame;
 
+        frame->format = ctx->format;
+        frame->hw_frames_ctx = av_buffer_ref(hwframe_ref);
+        if (!frame->hw_frames_ctx)
+            return AVERROR(ENOMEM);
+
         src_frame = av_frame_alloc();
         if (!src_frame)
             return AVERROR(ENOMEM);
@@ -467,7 +472,8 @@ int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
         if (ret < 0)
             return ret;
 
-        ret = av_hwframe_map(frame, src_frame, 0);
+        ret = av_hwframe_map(frame, src_frame,
+                             ctx->internal->source_allocation_map_flags);
         if (ret) {
             av_log(ctx, AV_LOG_ERROR, "Failed to map frame into derived "
                    "frame context: %d.\n", ret);
@@ -819,6 +825,12 @@ int av_hwframe_ctx_create_derived(AVBufferRef **derived_frame_ctx,
         goto fail;
     }
 
+    dst->internal->source_allocation_map_flags =
+        flags & (AV_HWFRAME_MAP_READ      |
+                 AV_HWFRAME_MAP_WRITE     |
+                 AV_HWFRAME_MAP_OVERWRITE |
+                 AV_HWFRAME_MAP_DIRECT);
+
     ret = AVERROR(ENOSYS);
     if (src->internal->hw_type->frames_derive_from)
         ret = src->internal->hw_type->frames_derive_from(dst, src, flags);
diff --git a/libavutil/hwcontext.h b/libavutil/hwcontext.h
index 37e8831f6bcb983544646ec9f47f7de10094d64f..edf12cc631a0294c9a36923e2475a54f2fd9ebe7 100644
--- a/libavutil/hwcontext.h
+++ b/libavutil/hwcontext.h
@@ -566,7 +566,9 @@ int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags);
  *                           AVHWFramesContext on.
  * @param source_frame_ctx   A reference to an existing AVHWFramesContext
  *                           which will be mapped to the derived context.
- * @param flags  Currently unused; should be set to zero.
+ * @param flags  Some combination of AV_HWFRAME_MAP_* flags, defining the
+ *               mapping parameters to apply to frames which are allocated
+ *               in the derived device.
  * @return       Zero on success, negative AVERROR code on failure.
  */
 int av_hwframe_ctx_create_derived(AVBufferRef **derived_frame_ctx,
diff --git a/libavutil/hwcontext_internal.h b/libavutil/hwcontext_internal.h
index 0a0c4e86ce44d7b103128184498ab85dbf2b25eb..68f78c0a1f47e7ad3b79bbebbf407f49d0b31000 100644
--- a/libavutil/hwcontext_internal.h
+++ b/libavutil/hwcontext_internal.h
@@ -121,6 +121,11 @@ struct AVHWFramesInternal {
      * context it was derived from.
      */
     AVBufferRef *source_frames;
+    /**
+     * Flags to apply to the mapping from the source to the derived
+     * frame context when trying to allocate in the derived context.
+     */
+    int source_allocation_map_flags;
 };
 
 typedef struct HWMapDescriptor {
diff --git a/libavutil/version.h b/libavutil/version.h
index 322b683cf40988ffb0387c96a77bc7e61fb58b3d..308d16f95bfec7e885315798381cb318cd34a779 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -80,7 +80,7 @@
 
 
 #define LIBAVUTIL_VERSION_MAJOR  55
-#define LIBAVUTIL_VERSION_MINOR  65
+#define LIBAVUTIL_VERSION_MINOR  66
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \