Small script to decrypt encrypted videos of https://gitlab.com/tnibler/cryptocam that replaces https://gitlab.com/tnibler/cryptocam-companion License: GPL-3.0-only: https://www.gnu.org/licenses/gpl-3.0-standalone.html

cryptocam_decrypt.sh

#!/bin/bash

# Copyright 2021 Martin Rey

# REQUIREMENTS
# bash, xargs, gpg2, ffmpeg, jq
#
# USAGE
# cryptocam_decrypt.sh INPUT_DIR OUTPUT_DIR
# 
# NOTE
# `pwd` is the default if a directory isn't set

shopt -s nullglob

# only add slash to directry path if a path is set 
test -z "${1}" || INPUT_DIR=$(realpath "${1}")/
test -z "${2}" || OUTPUT_DIR=$(realpath "${2}")/

# go through every encrypted metadata file, read its content
# and use it to decrypt the corresponding, encrypted media file
for encrypted_file in "${INPUT_DIR}"*.pgp; do
    gpg -q --decrypt "${encrypted_file}" | jq -r ".timestamp, .encryptionKey" | xargs sh -c "ffmpeg -decryption_key \$1 -i ${encrypted_file%%.*}.mp4 ${OUTPUT_DIR}/\$0.mp4"
done

Note: This in incompatible with the cryptocam versions >=2.0.0 !

Upstream has revamped basically every part of the project with the release of version 2. They've also switched to age for encrypting, among other things. That's one of the main reasons why this won't work anymore on videos captured with cryptocam 2.x.x
Luckily, they now also provide both a GUI and a CLI tool to decrypt the videos!

Take a look at https://gitlab.com/cryptocam/cryptocam-companion-cli (CLI) and https://gitlab.com/cryptocam/cryptocam-companion (GUI) if interested.

There's also a dedicated website over at https://cryptocam.gitlab.io/ with step by step guides, feature showcases and documentation.