Worked on the FFmpeg/FFmpeg repository to address a critical bug in chroma MTT depth parsing within the H.266 picture header, focusing on codec development and video processing using C. The solution involved updating the parser to respect the ph_max_mtt_hierarchy_depth_intra_slice_chroma condition and correctly handle scenarios where the sps_partition_constraints_override_enabled_flag overrides SPS values. This change aligned the implementation with the ITU-T H.266 V4 specification, mirroring the logic used for luma and inter-slice branches. The fix improved parser stability and decoding reliability, reducing edge-case failures and preventing desynchronization issues in affected video streams.