Adicione drawfilters extras à cadeia por vírgula separando-os
/usr/local/bin/ffmpeg -i "P1010377.MOV" -c:a libfaac -q:a 150 -c:v libx264 -crf:v 12 -preset:v veryslow -intra -vf "scale=640:-1, drawtext=fontfile=/Library/Fonts/Verdana.ttf:text='some filename.mp4':x=100:y=100:fontcolor='white', drawtext=fontsize=15:fontfile=/Library/Fonts/Verdana.ttf:timecode='00\:00\:00\:00':rate=25:fontsize=32:fontcolor='white':box=1:boxcolor=0x000000AA:x=10:y=10" "P1010377.MOV.MP4"