x265 y4m input doesn't work with 'mono' and 'mono16' color spaces

[Ma0]

The two commands are working:

ffmpeg -i 720p50_parkrun_ter.y4m -v error -pix_fmt gray -f rawvideo - | x265 - --input-res 1280x720 --fps 50/1 --input-csp i400 w.hevc

ffmpeg -i 720p50_parkrun_ter.y4m -v error -pix_fmt gray16le -f rawvideo - | x265 - --input-res 1280x720 --fps 50/1 --input-csp i400 --input-depth 16 w.hevc

The two commands are not working:

ffmpeg -i 720p50_parkrun_ter.y4m -v error -pix_fmt gray -f yuv4mpegpipe - | x265 --y4m - w.hevc

ffmpeg -i 720p50_parkrun_ter.y4m -v error -pix_fmt gray16le -f yuv4mpegpipe - | x265 --y4m - w.hevc

[Ma0]

Resolved by d059b4c