HEVC SPS-replacement PPS-validation bypass

Requires a platform with HEVC hardware decode (Intel/AMD VAAPI on Linux/ChromeOS, D3D11/DXVA on Windows, V4L2 stateless on ChromeOS-ARM). There is no in-Chromium memory corruption — the impact is in the GPU driver / kernel that receives num_tile_columns_minus1=18 together with an SPS that implies only 5 CTB columns.

Wrap the elementary stream first (Chrome will not demux raw Annex-B .hevc for <video src>):

ffmpeg -fflags +genpts -r 30 -i poc.hevc -c:v copy -tag:v hvc1 poc.mp4