[HELP] FFMPEG Help - x265 HDR HLG Encoding from MXF

[Selur]

Have you tried something like: (can't test atm., so the following is untested)

ffmpeg -ss 00:00:04.0 -i "INPUT.mxf" -vn -i "INPUT.mxf" -an -max_muxing_queue_size 1024 -c:v libx265 -pix_fmt yuv420p10le -x265-params "aq-mode=2:repeat-headers=0:strong-intra-smoothing=1:bframes=4:b-adapt=2:frame-threads=0:colorprim=bt2020:transfer=arib-std-67:colormatrix=bt2020nc:hdr10_opt=0:hdr10=0:chromaloc=0" -crf:v 18 -preset:v slow -filter_complex "[0:1][0:2]join=inputs=2:channel_layout=stereo[a]"   -c:a libfaac -q:a 100 -map 1:0 -map "[a]" -map_metadata -1 -r 25  -default_mode infer_no_subs  "OUTPUT.MP4"

explanation:

-ss 00:00:04.0 -i "INPUT.mxf" -vn -i "INPUT.mxf" -anf"

loads the source two times (index: 0 and index: 1), while one of the input (index: 0) is delayed and video is disabled (-vn) for the first input (index: 0) and audio is disabled (-an) for the second input (index: 1); not sure if the disabling of the audio/video is necessary, might be covered by the mapping later.

-max_muxing_queue_size 1024

is used to avoid 'Too many packets buffered for output stream'

-c:v libx265 -pix_fmt yuv420p10le -x265-params "aq-mode=2:repeat-headers=0:strong-intra-smoothing=1:bframes=4:b-adapt=2:frame-threads=0:colorprim=bt2020:transfer=arib-std-67:colormatrix=bt2020nc:hdr10_opt=0:hdr10=0:chromaloc=0" -crf:v 18 -preset:v slow

does the video encoding

-filter_complex "[0:1][0:2]join=inputs=2:channel_layout=stereo[a]" -c:a libfaac -q:a 100

does the audio channel changes and the reencodeing
"[0:1][0:2]": take stream with index 1 and index 2 from the source with index 0
"join=inputs=2:channel_layout=stereo": join these inputs using a stereo layout
"[a]": output as "a"

-map 1:0 -map "[a]"

Map the first stream form the second input (index: 0) and 'a' to the output.

-map_metadata -1

drops meta data from the inputs

-r 25

sets the output frame rate that should be set on the output

-default_mode infer_no_subs

tells ffmpeg to set no subtitle track as default track (no clue why you use it here)

"OUTPUT.MP4"

sets the output.

Like I wrote I'm not sure whether the '-an' and '-vn' are necessary, so the above might still not work, but should give a hint how to do it.

Cu Selur