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new 69568479a9 avformat/rtpenc: use unsigned type for ssrc option
69568479a9 is described below
commit 69568479a9dc737216165e751fc256e201d17732
Author: Neko Asakura <[email protected]>
AuthorDate: Fri Feb 20 20:24:08 2026 +0000
Commit: michaelni <[email protected]>
CommitDate: Sat Feb 28 01:23:12 2026 +0000
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 <[email protected]>
Signed-off-by: Michael Niedermayer <[email protected]>
---
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 },
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