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no-senders; approved; loop; banned-address; header-match-ffmpeg-devel.ffmpeg.org-0; header-match-ffmpeg-devel.ffmpeg.org-1; header-match-ffmpeg-devel.ffmpeg.org-2; header-match-ffmpeg-devel.ffmpeg.org-3; emergency; member-moderation X-Mailman-Version: 3.3.10 Precedence: list Reply-To: FFmpeg development discussions and patches Subject: [FFmpeg-devel] [PR] avformat/rtpenc: use unsigned type for ssrc option (PR #22302) List-Id: FFmpeg development discussions and patches Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: michaelni via ffmpeg-devel Cc: michaelni Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Archived-At: List-Archive: List-Post: PR #22302 opened by michaelni URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22302 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22302.patch The ssrc option used AV_OPT_TYPE_INT with range [INT_MIN, INT_MAX], but the underlying struct field is uint32_t and RFC 3550 defines SSRC as a 32-bit identifier covering the full [0, UINT32_MAX] range. This caused ffmpeg to reject any SSRC value above INT_MAX (~2.1 billion), which is roughly half of all valid values. The auto-generated fallback path (av_get_random_seed()) already returns uint32_t and can produce values above INT_MAX, creating an inconsistency where the automatic path succeeds but the explicit -ssrc option rejects the same value. Change the option to AV_OPT_TYPE_UINT with range [0, UINT32_MAX] to match the field type and allow the full identifier space. Fixes ticket #9080. Signed-off-by: Neko Asakura Signed-off-by: Michael Niedermayer >>From fcb7c9cd5cd2257620eaf7a7861238f03b1e6629 Mon Sep 17 00:00:00 2001 From: Neko Asakura Date: Fri, 20 Feb 2026 20:24:08 +0000 Subject: [PATCH] avformat/rtpenc: use unsigned type for ssrc option The ssrc option used AV_OPT_TYPE_INT with range [INT_MIN, INT_MAX], but the underlying struct field is uint32_t and RFC 3550 defines SSRC as a 32-bit identifier covering the full [0, UINT32_MAX] range. This caused ffmpeg to reject any SSRC value above INT_MAX (~2.1 billion), which is roughly half of all valid values. The auto-generated fallback path (av_get_random_seed()) already returns uint32_t and can produce values above INT_MAX, creating an inconsistency where the automatic path succeeds but the explicit -ssrc option rejects the same value. Change the option to AV_OPT_TYPE_UINT with range [0, UINT32_MAX] to match the field type and allow the full identifier space. Fixes ticket #9080. Signed-off-by: Neko Asakura Signed-off-by: Michael Niedermayer --- libavformat/rtpenc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/rtpenc.c b/libavformat/rtpenc.c index 3602b081d5..6d8e95f4c3 100644 --- a/libavformat/rtpenc.c +++ b/libavformat/rtpenc.c @@ -33,7 +33,7 @@ static const AVOption options[] = { FF_RTP_FLAG_OPTS(RTPMuxContext, flags), { "payload_type", "Specify RTP payload type", offsetof(RTPMuxContext, payload_type), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 127, AV_OPT_FLAG_ENCODING_PARAM }, - { "ssrc", "Stream identifier", offsetof(RTPMuxContext, ssrc), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, + { "ssrc", "Stream identifier", offsetof(RTPMuxContext, ssrc), AV_OPT_TYPE_UINT, { .i64 = 0 }, 0, UINT32_MAX, AV_OPT_FLAG_ENCODING_PARAM }, { "cname", "CNAME to include in RTCP SR packets", offsetof(RTPMuxContext, cname), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM }, { "seq", "Starting sequence number", offsetof(RTPMuxContext, seq), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 65535, AV_OPT_FLAG_ENCODING_PARAM }, { NULL }, -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org