How to enable in_parallel option?

[zhanglingran]

when I use the in_parallel parameter, the above error occurred during encoding.

the encoding command is as follows.

numactl -N 0,1,2,3 ./ffmpeg -stream_loop -1 \
        -i $1 -input_type 1 -rc 1 \
        -c:v:0 distributed_encoder \
        -in_parallel 1 \
        -s:0 7680x3840 \
        -tile_row:0 6 -tile_column:0 12 \
        -config_file:0 config_high.xml \
        -la_depth:0 0 -r:0 25 -g:0 25 \
        -b:0 50M -map 0:v \
        -c:v:1 distributed_encoder \
        -in_parallel 1 \
        -s:1 1280x1280 -sws_flags neighbor \
        -tile_row:1 2 -tile_column:1 2 \
        -config_file:1 config_low.xml \
        -la_depth:1 0 -r:1 25 -g:1 25 \
        -b:1 2M -map 0:v -vframes 5400 \
        -f omaf_packing \
        -is_live 0 -split_tile 1 -seg_duration 1 \
        -base_url ${URLBASE}/VOD8K/ \
        -out_name Test /usr/local/nginx/html/VOD8K/