0.7.0 Release Candidate 1

Changes:

• Raspberry Pi 3/4 Support
• Update ffmpeg to 4.3.1
• Support multiple coral devices
• Reduce CPU usage of ffmpeg and motion detection
• Replace underlying memory store with shared_memory and update to Python 3.8
• Smaller docker images due to switch to multistage builds
• shm-size parameter no longer necessary for the majority of scenarios

Breaking Changes:

• MQTT snapshots no longer draw regions or bounding boxes
• Default output_args for cameras have changed. If you specified custom output parameters, you will need to update.
• Updated config for specifying coral device. See new detectors section in the example config.
• New json structure at /debug/stats to handle multiple detectors

Images:

• x86: blakeblackshear/frigate:0.7.0-rc1
• Raspberry Pi 3/4 (32bit): blakeblackshear/frigate:0.7.0-rc1-armv7hf
• Raspberry Pi 4 (64bit): blakeblackshear/frigate:0.7.0-rc1-arm64