diff --git a/libavformat/swfdec.c b/libavformat/swfdec.c
index 27412180e9898814f7f53f50a00088b49d54a3c3..6f7092694c70539536bea37f6a0e054603fac552 100644
--- a/libavformat/swfdec.c
+++ b/libavformat/swfdec.c
@@ -111,7 +111,7 @@ static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
                 return -1;
             vst->codec->codec_type = CODEC_TYPE_VIDEO;
             vst->codec->codec_id = codec_get_id(swf_codec_tags, get_byte(pb));
-            av_set_pts_info(vst, 64, 256, swf->frame_rate);
+            av_set_pts_info(vst, 16, 256, swf->frame_rate);
             vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
             len -= 8;
         } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {