vt-framerate.patch

diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
index e6d10928d5..c8131d299d 100644
--- a/libavcodec/videotoolboxenc.c
+++ b/libavcodec/videotoolboxenc.c
@@ -896,8 +896,10 @@ static int vtenc_create_encoder(AVCodecContext   *avctx,
                                 VTCompressionSessionRef *session)
 {
     VTEncContext *vtctx = avctx->priv_data;
+    double       frame_rate = av_q2d(avctx->framerate);
     SInt32       bit_rate = avctx->bit_rate;
     SInt32       max_rate = avctx->rc_max_rate;
+    CFNumberRef  frame_rate_num;
     CFNumberRef  bit_rate_num;
     CFNumberRef  bytes_per_second;
     CFNumberRef  one_second;
@@ -944,6 +946,21 @@ static int vtenc_create_encoder(AVCodecContext   *avctx,
         return AVERROR_EXTERNAL;
     }
 
+    frame_rate_num = CFNumberCreate(kCFAllocatorDefault,
+                                  kCFNumberDoubleType,
+                                  &frame_rate);
+    if (!frame_rate_num) return AVERROR(ENOMEM);
+
+    status = VTSessionSetProperty(vtctx->session,
+                                  kVTCompressionPropertyKey_ExpectedFrameRate,
+                                  frame_rate_num);
+    CFRelease(frame_rate_num);
+
+    if (status) {
+        av_log(avctx, AV_LOG_ERROR, "Error setting framerate property: %d\n", status);
+        return AVERROR_EXTERNAL;
+    }
+
     bytes_per_second_value = max_rate >> 3;
     bytes_per_second = CFNumberCreate(kCFAllocatorDefault,
                                       kCFNumberSInt64Type,