diff --git a/ffmpeg.c b/ffmpeg.c
index b962d5e..c60b330 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -750,6 +750,7 @@ static void close_output_stream(OutputStream *ost)
 static void output_packet(AVFormatContext *s, AVPacket *pkt, OutputStream *ost)
 {
     int ret = 0;
+    static int done = 0;

     /* apply the output bitstream filters, if any */
     if (ost->nb_bitstream_filters) {
@@ -782,6 +783,19 @@ static void output_packet(AVFormatContext *s, AVPacket *pkt, OutputStream *ost)
     } else
         write_packet(s, pkt, ost);

+    if (!done) {
+        if(ost->nb_bitstream_filters && ost->bsf_ctx[0]->par_out->extradata_size) {
+            av_freep(&ost->st->codecpar->extradata);
+            ost->st->codecpar->extradata_size = 0;
+            ost->st->codecpar->extradata = av_mallocz(ost->bsf_ctx[0]->par_out->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
+            if (!ost->st->codecpar->extradata)
+                goto finish;
+            memcpy(ost->st->codecpar->extradata, ost->bsf_ctx[0]->par_out->extradata, ost->bsf_ctx[0]->par_out->extradata_size);
+            ost->st->codecpar->extradata_size = ost->bsf_ctx[0]->par_out->extradata_size;
+        }
+        done = 1;
+    }
+
 finish:
     if (ret < 0 && ret != AVERROR_EOF) {
         av_log(NULL, AV_LOG_FATAL, "Error applying bitstream filters to an output "