diff --git a/libavformat/rtpenc.c b/libavformat/rtpenc.c index 5abd490cc4..3a541dd283 100644 --- a/libavformat/rtpenc.c +++ b/libavformat/rtpenc.c @@ -133,8 +133,7 @@ static int rtp_write_header(AVFormatContext *s1) break; case CODEC_ID_H264: /* check for H.264 MP4 syntax */ - if (st->codec->extradata_size > 0 && st->codec->extradata && - st->codec->extradata[0] == 1) { + if (st->codec->extradata_size > 4 && st->codec->extradata[0] == 1) { s->nal_length_size = (st->codec->extradata[4] & 0x03) + 1; } break;