43a08d907b
Default to enable uniform_spacing_flag. Guess level by the tile
rows/cols. Supported for ICL+ platforms.
Also add documentations.
To encode with 4 rows 2 columns:
ffmpeg ... -c:v hevc_vaapi -tiles 4x2 ...
ffmpeg ... -c:v hevc_vaapi -tile_rows 4 -tile_cols 2 ...
Suggested-by: Jun Zhao <mypopydev@gmail.com>
Signed-off-by: Linjie Fu <linjie.justin.fu@gmail.com>