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commit 72a46d7802717887ce7eccd569246ce7a03e41a3 Author: 牟凡 <[email protected]> AuthorDate: Wed Apr 29 15:17:32 2026 +0800 Commit: Frank Plowman <[email protected]> CommitDate: Wed Jun 10 15:12:23 2026 +0100 avcodec/cbs_h266: fix wrong condition for chroma MTT depth in PH In the picture header parser, the chroma branch incorrectly tested sps_max_mtt_hierarchy_depth_intra_slice_chroma to decide whether to parse ph_log2_diff_max_{bt,tt}_min_qt_intra_slice_chroma. Per ITU-T H.266 (V4, 01/2026) section 7.3.2.8 "Picture header structure syntax", the condition is on the just-parsed ph_max_mtt_hierarchy_depth_intra_slice_chroma, exactly mirroring the luma branch a few lines above and the inter-slice branch below. sps_partition_constraints_override_enabled_flag allows the picture header to override the SPS values, so testing the SPS field is incorrect and desynchronises the parser whenever the PH override changes the chroma MTT depth from/to zero. Signed-off-by: Mou Fan <[email protected]> (cherry-picked from commit 28ecb07e55eabb481082c869b4bef3e36e1e0621) --- libavcodec/cbs_h266_syntax_template.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/cbs_h266_syntax_template.c b/libavcodec/cbs_h266_syntax_template.c index 505c28a833..fa2a6a6e3c 100644 --- a/libavcodec/cbs_h266_syntax_template.c +++ b/libavcodec/cbs_h266_syntax_template.c @@ -2808,7 +2808,7 @@ static int FUNC(picture_header) (CodedBitstreamContext *ctx, RWContext *rw, 0, FFMIN(6, ctb_log2_size_y) - min_cb_log2_size_y); ue(ph_max_mtt_hierarchy_depth_intra_slice_chroma, 0, 2 * (ctb_log2_size_y - min_cb_log2_size_y)); - if (sps->sps_max_mtt_hierarchy_depth_intra_slice_chroma != 0) { + if (current->ph_max_mtt_hierarchy_depth_intra_slice_chroma != 0) { unsigned int min_qt_log2_size_intra_c = sps->sps_log2_diff_min_qt_min_cb_intra_slice_chroma + min_cb_log2_size_y; _______________________________________________ ffmpeg-cvslog mailing list -- [email protected] To unsubscribe send an email to [email protected]
