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I know that I record by issuing the command raspivid -o filename.h264 -t 100000 (film for 100 seconds) but how do I specify the directory at witch I want to store the file?

Usb is at dev/sdb1

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You need to create a directory for and mount the filesystem on the USB drive.

mkdir /mnt/usb
mount /dev/sdb1 /mnt/usb

Then you can specify the directory of where the USB drive is now mounted in the same command you issued before, like this:

raspivid -o /mnt/usb/filename.h264 -t 100000
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  • Does the camera store the video on the MicroSd card first and then transferes to the USB drive or does it store it there directly?
    – Clone
    Nov 8, 2016 at 5:09
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    Directly to usb. By mounting the usb drive partition (named: /dev/sdb1) onto the directory /mnt/usb everything that you write under /mnt/usb with be written directly to the usb drive and should never touch the sdcard. You will need to mount the usb each time it is inserted or you reboot the device unless you configure it to automatically mount upon detection/boot. You will also want to ensure that you use the command: umount /mnt/usb before removing the drive, so it has a chance to sync any unwritten data to the drive.
    – Hydranix
    Nov 20, 2016 at 6:23

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