diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
index 422e14585e..26e61507dc 100644
--- a/libavformat/nsvdec.c
+++ b/libavformat/nsvdec.c
@@ -177,6 +177,7 @@ typedef struct NSVContext {
     AVRational framerate;
     uint32_t *nsvs_timestamps;
     //DVDemuxContext* dv_demux;
+    int nsvf;
 } NSVContext;
 
 static const AVCodecTag nsv_codec_video_tags[] = {
@@ -280,6 +281,12 @@ static int nsv_parse_NSVf_header(AVFormatContext *s)
 
     nsv->state = NSV_UNSYNC; /* in case we fail */
 
+    if (nsv->nsvf) {
+        av_log(s, AV_LOG_TRACE, "Multiple NSVf\n");
+        return 0;
+    }
+    nsv->nsvf = 1;
+
     size = avio_rl32(pb);
     if (size < 28)
         return -1;