EOS7D No sound on video streaming

[mercifulboss]

Describe the bug

I am trying to use the Canon EOS7D for video streaming to youtube. However, it doesn't seem to use my camera microphone but rather uses my shitty laptop microphone

Name the camera
Canon EOS 7D usb:001,005

libgphoto2 and gphoto2 version
output of: gphoto2 --version
gphoto2 2.5.28
libgphoto2 2.5.31
libgphoto2_port 0.12.2

Archlinux
To Reproduce
gphoto2 --stdout autofocusdrive=1 --capture-movie --capture-sound | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video4

The command

gphoto2 --capture-sound with the camera plugged in and turned on gives the output:

ERROR: Could not capture image
ERROR: Could not capture
*** Error (-6: 'Unsupported operation') ***

If its a camera misbehavior, attach debug output using --debug --debug-logfile=debug.log (if considered useful).

gphoto2 is almost feature complete but it seems only this last thing remains. Since its an old camera it doesn't have wifi I can't use android apps to detect the sound. Please help!

[msmeissn]

the sound feed cannot be captured separately.
only way would be to capture the full movie stream and extract the sound from that.

(with this method:
Newer Canon EOS DSLRs (around 7D and later) : Switch the camera to movie record mode on the camera. Then run gphoto2 --set-config viewfinder=1 --set-config movierecordtarget=Card --wait-event=10s --set-config movierecordtarget=None --wait-event-and-download=2s (before 2.5.6, replace viewfinder by eosviewfinder). If this does not work, check and switch the capturetarget to SD Card (gphoto2 --set-config capturetarget=1)
)