[PATCH] avformat/whip: mark as experimental

[Jack Lau]

This muxer has been marked AVFMT_EXPERIMENTAL.

Add a note in muxers.texi that WHIP is an experimental feature

This patch doesn't effect WHIP usage command, as WHIP always
needs to be explicitly specified

The details as follows:
https://ffmpeg.org/pipermail/ffmpeg-devel/2025-June/344705.html

Signed-off-by: Jack Lau <jacklau1222 at qq.com>
---
 doc/muxers.texi    | 2 ++
 libavformat/whip.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/doc/muxers.texi b/doc/muxers.texi
index 30c95c3d34..d2ee90bf33 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -3885,6 +3885,8 @@ ffmpeg -f webm_dash_manifest -i video1.webm \
 WebRTC (Real-Time Communication) muxer that supports sub-second latency streaming according to
 the WHIP (WebRTC-HTTP ingestion protocol) specification.
 
+This is an experimental feature.
+
 It uses HTTP as a signaling protocol to exchange SDP capabilities and ICE lite candidates. Then,
 it uses STUN binding requests and responses to establish a session over UDP. Subsequently, it
 initiates a DTLS handshake to exchange the SRTP encryption keys. Lastly, it splits video and
diff --git a/libavformat/whip.c b/libavformat/whip.c
index 710f24fc5a..bb7b8657dc 100644
--- a/libavformat/whip.c
+++ b/libavformat/whip.c
@@ -1907,7 +1907,7 @@ const FFOutputFormat ff_whip_muxer = {
     .p.long_name        = NULL_IF_CONFIG_SMALL("WHIP(WebRTC-HTTP ingestion protocol) muxer"),
     .p.audio_codec      = AV_CODEC_ID_OPUS,
     .p.video_codec      = AV_CODEC_ID_H264,
-    .p.flags            = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
+    .p.flags            = AVFMT_GLOBALHEADER | AVFMT_NOFILE | AVFMT_EXPERIMENTAL,
     .p.priv_class       = &whip_muxer_class,
     .priv_data_size     = sizeof(WHIPContext),
     .init               = whip_init,
-- 
2.49.0