Some x265 additional params are being ignored by the encoder

I can’t figure out why no-sao and selective-sao=0 are being ignored. Additional params are deblock=-3:-3:no-sao:selective-sao=0:keyint=240 Raw command is "ffmpeg.exe" -y -i "file.mkv" -max_muxing_queue_size 1024 -map 0:0 -c:v libx265 -pix_fmt yuv420p10le -x265-params "deblock=-3:-3:no-sao:selective-sao=0:keyint=240:aq-mode=2:repeat-headers=1:strong-intra-smoothing=1:bframes=4:b-adapt=2:frame-threads=0:colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc:hdr10_opt=1:master-display=G(8500,39850)B(6550,2300)R(35400,14600)WP(15635,16450)L(10000000,20):max-cll=0,0:hdr10=1" -crf 17 -preset medium -map_metadata -1 -map_chapters 0 -map 0:4 -c:1 copy -disposition:1 default -metadata:s:1 language='eng' -map 0:5 -c:2 copy -disposition:2 0 -metadata:s:2 language='eng' -map 0:6 -c:3 copy -disposition:3 0 -metadata:s:3 language='chi' -map 0:7 -c:4 copy -disposition:4 0 -metadata:s:4 language='hrv' -map 0:8 -c:5 copy -disposition:5 0 -metadata:s:5 language='cze' -map 0:9 -c:6 copy -disposition:6 0 -metadata:s:6 language='dan' -map 0:10 -c:7 copy -disposition:7 0 -metadata:s:7 language='dut' -map 0:11 -c:8 copy -disposition:8 0 -metadata:s:8 language='fin' -map 0:12 -c:9 copy -disposition:9 0 -metadata:s:9 language='fre' -map 0:13 -c:10 copy -disposition:10 0 -metadata:s:10 language='ger' -map 0:14 -c:11 copy -disposition:11 0 -metadata:s:11 language='gre' -map 0:15 -c:12 copy -disposition:12 0 -metadata:s:12 language='heb' -map 0:16 -c:13 copy -disposition:13 0 -metadata:s:13 language='hun' -map 0:17 -c:14 copy -disposition:14 0 -metadata:s:14 language='ita' -map 0:18 -c:15 copy -disposition:15 0 -metadata:s:15 language='kor' -map 0:19 -c:16 copy -disposition:16 0 -metadata:s:16 language='nor' -map 0:20 -c:17 copy -disposition:17 0 -metadata:s:17 language='pol' -map 0:21 -c:18 copy -disposition:18 0 -metadata:s:18 language='por' -map 0:22 -c:19 copy -disposition:19 0 -metadata:s:19 language='por' -map 0:23 -c:20 copy -disposition:20 0 -metadata:s:20 language='rum' -map 0:24 -c:21 copy -disposition:21 0 -metadata:s:21 language='rus' -map 0:25 -c:22 copy -disposition:22 0 -metadata:s:22 language='slv' -map 0:26 -c:23 copy -disposition:23 0 -metadata:s:23 language='spa' -map 0:27 -c:24 copy -disposition:24 0 -metadata:s:24 language='spa' -map 0:28 -c:25 copy -disposition:25 0 -metadata:s:25 language='swe' -map 0:29 -c:26 copy -disposition:26 0 -metadata:s:26 language='tha' -map 0:30 -c:27 copy -disposition:27 0 -metadata:s:27 language='tur' "file2.mkv" The mediainfo of the output file shows, amongst other things ...deblock=-3:-3 / sao / no-sao-non-deblock / rd=3 / selective-sao=4.... So deblock is working but options for sao are being ignored. keyint=240 is also there so there’s something specific about sao. Is it option in the UI that I’m just missing which is overriding the extra parameters?

[E-t-z]

I just use it to avoid bitrate overshooting, over particular level spec, with very low crf’s which I sometimes use. And I was a bit unsure, when encoding HEVC, if I should use Advanced options or add it as x265 param, hence I continued to use it as I initially set it up in custom profile.

BTW, I started to use VBV, when there were no advanced panel available 😄

[clidx]

I figured it out. ffmpeg requires different values of the same parameter to be separated by a , rather than : like Handbrake etc. So it should be deblock=-3,-3. For some reason this causes the parsing of the next parameter to fail, so in my case it was trying to read -3:no-sao as a single parameter (which is odd since it has a : in it). Also all parameters must be assigned a value even if they can be used on their own in other libx265 encoders, e.g. no-sao=1 or sao=0. With the person who messaged you, since the deblock param is so common in x265 encoding, that could be the problem as well.