the source is HDCAM and like Betacam Digital it's 20 bit audio on tape, HDCAM SR is 24bit.
Indeed, those are strange delivery specification. After research, i got some info, it's 24bit file but 20bit audio and 4 empty bit.
I capture that 20bit source in a 24bit format, hoping to get only 20 active bit, i just deliver, waiting for a reply from client to see if the file is ok.