+
+ if (par->codec_id == AV_CODEC_ID_VP9) {
+ int ret = ff_stream_add_bitstream_filter(s->streams[0], "vp9_superframe", NULL);
+ if (ret < 0)
+ return ret;
+ } else if (par->codec_id == AV_CODEC_ID_AV1) {
+ int ret = ff_stream_add_bitstream_filter(s->streams[0], "av1_metadata", "td=insert");
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ivf_write_header(AVFormatContext *s)
+{
+ AVCodecParameters *par = s->streams[0]->codecpar;
+ AVIOContext *pb = s->pb;
+