Some devices expect it this way.
---

Not sure if it worthy an option.

 libavformat/rtpenc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libavformat/rtpenc.c b/libavformat/rtpenc.c
index d330607..c501870 100644
--- a/libavformat/rtpenc.c
+++ b/libavformat/rtpenc.c
@@ -187,8 +187,11 @@ static int rtp_write_header(AVFormatContext *s1)
         break;
     case AV_CODEC_ID_H264:
         /* check for H.264 MP4 syntax */
-        if (st->codec->extradata_size > 4 && st->codec->extradata[0] == 1) {
-            s->nal_length_size = (st->codec->extradata[4] & 0x03) + 1;
+        if (st->codec->extradata_size > 4) {
+            if (st->codec->extradata[0] == 1)
+                s->nal_length_size = (st->codec->extradata[4] & 0x03) + 1;
+            ff_rtp_send_h264(s1, st->codec->extradata,
+                             st->codec->extradata_size);
         }
         break;
     case AV_CODEC_ID_VORBIS:
--
1.8.3.2

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