Can't output on more than 51 quality

[TimeParabox]

When I enter the quality, it only supports up to 51 quality

[JustVldKsh]

From what i understand, this is FFmpeg's CRF setting (relevant FFmpeg wiki page), it goes from 0 to 51 where 0 is the best quality (lossless, max size), 23 is FFmpeg's default and 51 is the worst (maximum losses, smallest size)