Worked on the libsdl-org/aom repository to improve the reliability of AV1 High Bit Depth (HighBD) video encoding workflows. Focused on low-level optimization and bug fixing using C and ARM NEON intrinsics, addressing a specific issue in the av1_highbd_pixel_proj_error_neon function. Corrected an indexing error in the tail loop that previously caused inaccurate projection error calculations when processing image widths not divisible by eight. The solution involved careful adjustment of loop logic to ensure correctness across all width cases, reducing the risk of misprojections in Neon-accelerated code paths and enhancing the accuracy of HighBD video processing routines.