diff --git a/plugins/mac-vth264/encoder.c b/plugins/mac-vth264/encoder.c
index 4fec74de7..8551a1aee 100644
--- a/plugins/mac-vth264/encoder.c
+++ b/plugins/mac-vth264/encoder.c
@@ -660,17 +660,15 @@ static bool parse_sample(struct vt_h264_encoder *enc, CMSampleBufferRef buffer,
 	CMTime pts = CMSampleBufferGetPresentationTimeStamp(buffer);
 	CMTime dts = CMSampleBufferGetDecodeTimeStamp(buffer);
 
-	pts = CMTimeMultiplyByFloat64(pts,
-				      ((Float64)enc->fps_num / enc->fps_den));
-	dts = CMTimeMultiplyByFloat64(dts,
-				      ((Float64)enc->fps_num / enc->fps_den));
-
 	if (CMTIME_IS_INVALID(dts))
 		dts = pts;
 	// imitate x264's negative dts when bframes might have pts < dts
 	else if (enc->bframes)
 		dts = CMTimeSubtract(dts, off);
 
+	pts = CMTimeMultiply(pts, enc->fps_num);
+	dts = CMTimeMultiply(dts, enc->fps_num);
+
 	bool keyframe = is_sample_keyframe(buffer);
 
 	da_resize(enc->packet_data, 0);
@@ -772,7 +770,7 @@ static bool vt_h264_encode(void *data, struct encoder_frame *frame,
 
 	CMTime dur = CMTimeMake(enc->fps_den, enc->fps_num);
 	CMTime off = CMTimeMultiply(dur, 2);
-	CMTime pts = CMTimeMultiply(dur, frame->pts);
+	CMTime pts = CMTimeMake(frame->pts, enc->fps_num);
 
 	CVPixelBufferRef pixbuf = NULL;