is there any way to include subtitles?

when i using the command

`./mp4muxer_mac -o "Liaison.mp4" -i out/out_2.ec3 -i out/out_1.h265 -i out/out_3.data`

i get

`ERROR! Input ES type: dat, extension not supported`

Edit:
this is the command i'm using to demux
`./mp4demuxer_mac --input-file Liaison.mp4 --output-folder out`