diff --git a/src/video_capture/DirectShowGrabber.cpp b/src/video_capture/DirectShowGrabber.cpp
index 4739dac17..1c234d229 100644
--- a/src/video_capture/DirectShowGrabber.cpp
+++ b/src/video_capture/DirectShowGrabber.cpp
@@ -1317,7 +1317,8 @@ static struct video_frame * vidcap_dshow_grab(void *state, struct audio_frame **
 	s->frame->tiles[0].data = (char *) s->returnBuffer;
 	//fprintf(stderr, "[dshow] s: %p\n", s);
 	//s->tile->data_len = s->width * s->height * 3;
-	s->frame->tiles[0].data_len = s->returnBufferLen;
+	s->frame->tiles[0].data_len = is_codec_opaque(s->frame->color_spec) ? s->returnBufferLen :
+		vc_get_datalen(s->frame->tiles[0].width, s->frame->tiles[0].height, s->frame->color_spec);
 
 /*
 	fprintf(stderr, "[dshow] s5: %p\n", s);