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The following commit(s) were added to refs/heads/master by this push:
new fd290e2fcd avcodec/cbs_av1_syntax_template: reset seen_frame_header on
sequence headers
fd290e2fcd is described below
commit fd290e2fcdd431bdce5ae7f308d22e7eaa3afa96
Author: Michael Niedermayer <[email protected]>
AuthorDate: Mon Jun 15 03:38:11 2026 +0200
Commit: michaelni <[email protected]>
CommitDate: Mon Jun 15 17:10:52 2026 +0000
avcodec/cbs_av1_syntax_template: reset seen_frame_header on sequence
headers
With this change CBS and the decoder appear to be in sync.
Fixes: division by 0
Fixes:
501794431/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AV1_fuzzer-4792576644546560
Fixes:
501898692/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AV1_fuzzer-4772278394224640
Found-by: continuous fuzzing process
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <[email protected]>
---
libavcodec/cbs_av1_syntax_template.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavcodec/cbs_av1_syntax_template.c
b/libavcodec/cbs_av1_syntax_template.c
index f43c3a4de5..f3d84f3c05 100644
--- a/libavcodec/cbs_av1_syntax_template.c
+++ b/libavcodec/cbs_av1_syntax_template.c
@@ -186,10 +186,13 @@ static int FUNC(decoder_model_info)(CodedBitstreamContext
*ctx, RWContext *rw,
static int FUNC(sequence_header_obu)(CodedBitstreamContext *ctx, RWContext *rw,
AV1RawSequenceHeader *current)
{
+ CodedBitstreamAV1Context *priv = ctx->priv_data;
int i, err;
HEADER("Sequence Header");
+ priv->seen_frame_header = 0;
+
fc(3, seq_profile, AV_PROFILE_AV1_MAIN,
AV_PROFILE_AV1_PROFESSIONAL);
flag(still_picture);
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