tecteun

Convert MP4 file to animated WEBP file in ffmpeg CLI

In terminal.app, install ffmpeg through homebrew

brew install ffmpeg

Validate the installation:

	Official	3rd-party
Supports SLIM Models^*1	❌	❌
RJ45 Network Port (Ethernet)	✔️	❌

This guide is for Windows.

Connect phone via USB to PC, wait a while for drivers to install.
Install "Minimal ADB Fastboot" (from XDA-Developers).
Enable USB DEBUG under "Config / Developer Options" on phone.
Open a Command Prompt under the folder "C:\Program Files (x86)\Minimal ADB and Fastboot"
Open phone adb shell: adb shell
Use the following commands:

All content keys were redacted, they should be 128-bit hex strings.
These methods involve the use of ffmpeg and -cenc_decryption_key which is not part of stable releases as of July 2022. Use nightlies from gyan.dev or some other autobuild in the meantime. Hopefully it gets added in the next stable release.
On my end none of these were particularly reliable. This may change in the future as FFmpeg evolves. The direct method of playing with ffplay is currently the most reliable out of the listed methods.

	#include <Arduino.h>

	#define FREQUENCY 21000
	const uint16_t sample_count = 1000000 / FREQUENCY; // Reorganization of the (48MHz / (sample_count * freq)) - 1 to compute array size.
	uint16_t lut[sample_count];

	// https://forum.arduino.cc/t/samd51-dac-using-dma-seems-too-fast/678418/4
	typedef struct // DMAC descriptor structure
	{
	uint16_t btctrl;