[FFmpeg-cvslog] avformat/rtpenc: Add flag AVFMT_NODIMENSIONS.

[Koushik Dutta]

ffmpeg | branch: master | Koushik Dutta <koushd at gmail.com> | Wed Mar 26 13:13:13 2025 -0700| [2657e1679ef595ad4e873cfae5a069dd559a762e] | committer: Michael Niedermayer

avformat/rtpenc: Add flag AVFMT_NODIMENSIONS.

Not all rtp formats require the video dimensions to be available
up front. H264 and HEVC will send them as stream parameters.
The flag is restrictive and prevents RTP repacketization
without parsing the codec information out of the stream.

This change checks to see if the codec parameters are available
on the rtp formats that need it.

Signed-off-by: Koushik Dutta <koushd at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2657e1679ef595ad4e873cfae5a069dd559a762e
---

 libavformat/rtpenc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/libavformat/rtpenc.c b/libavformat/rtpenc.c
index 3db13ee0b2..8b989dca71 100644
--- a/libavformat/rtpenc.c
+++ b/libavformat/rtpenc.c
@@ -635,10 +635,18 @@ static int rtp_write_packet(AVFormatContext *s1, AVPacket *pkt)
         rtp_send_ilbc(s1, pkt->data, size);
         break;
     case AV_CODEC_ID_MJPEG:
+        if (st->codecpar->width <= 0 || st->codecpar->height <= 0) {
+            av_log(s1, AV_LOG_ERROR, "dimensions not set\n");
+            return AVERROR(EINVAL);
+        }
         ff_rtp_send_jpeg(s1, pkt->data, size);
         break;
     case AV_CODEC_ID_BITPACKED:
     case AV_CODEC_ID_RAWVIDEO: {
+        if (st->codecpar->width <= 0 || st->codecpar->height <= 0) {
+            av_log(s1, AV_LOG_ERROR, "dimensions not set\n");
+            return AVERROR(EINVAL);
+        }
         int interlaced = st->codecpar->field_order != AV_FIELD_PROGRESSIVE;
 
         ff_rtp_send_raw_rfc4175(s1, pkt->data, size, interlaced, 0);
@@ -685,5 +693,5 @@ const FFOutputFormat ff_rtp_muxer = {
     .write_packet      = rtp_write_packet,
     .write_trailer     = rtp_write_trailer,
     .p.priv_class      = &rtp_muxer_class,
-    .p.flags           = AVFMT_TS_NONSTRICT,
+    .p.flags           = AVFMT_NODIMENSIONS | AVFMT_TS_NONSTRICT,
 };