Record MP4 with Blackmagic devices tools & FFMPEG

bmdtools_ffmpeg_recording.md

Requirements

Use with Blackmagic devices tools.

Shell command

• Input is 1080p 25fps (-m 7) with audio & video from HDMI (-A 3 -V 3)
• Output is 720p 25fps at ca. 5mbit h264

bmdcapture -m 7 -A 2 -V 3 -c 2 -d 0 -v -F nut -C 0 -f pipe:1 | \
  ffmpeg -y -r 25 -probesize 10M -i - \
  -c:a libfdk_aac -ac 2 -b:a 96k -ar 44100 -c:v libx264 -pix_fmt yuv420p -profile:v main -level 32 -b:v 5000K \
  -r 25 -f mp4 -vf "scale=1280:-1" output.mp4