Brian R dudewheresmycode

Generate 2min of colorbars and audio

ffmpeg \
-f lavfi -i "sine=frequency=1000:duration=120" \
-f lavfi \
-i testsrc=duration=5:size=1280x720:rate=24 \
-t 120 \
-map 0:0 \
-map 1:0 \

Some notes on getting Debian 10 (stable) installed and running on the Beelink U57 Mini PC with Intel Core i5-5257u Processor.

Install Debian

Create a bootable USB Flash drive of the Debian 10 netinst ISO using Etcher.

Download ISO from Debian: https://www.debian.org/distrib/netinst
Flash to SD Card using Balena Etcher https://www.balena.io/etcher/
Connect ethernet cable to Beelink

Note: The firmware needed to use the Beelink's onboard Intel Wifi is proprietary, and is not included with the default install of Debian. If you don't have the option of a wired LAN connection you can use an "unofficial" Debian CD image, that includes the proprietary (non-free) firmware. (https://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/) See the below section on installing the firmware later on.

Immediately after startup press the Del key to enter the BIOS.

Basic ffmpeg scene detection:

ffmpeg -i input.flv -filter:v "select='gt(scene,0.4)',showinfo" -f null -

scene (video only) value between 0 and 1 to indicate a new scene; a low value reflects a low probability for the current frame to introduce a new scene, while a higher value means the current frame is more likely to be one (see the example below) https://ffmpeg.org/ffmpeg-filters.html#select_002c-aselect

Set the scene change detection threshold as a percentage of maximum change on the luma plane. Good values are in the [8.0, 14.0] range. Scene change detection is only relevant in case combmatch=sc. The range for scthresh is [0.0, 100.0].

	# Define the P/Invoke signatures
	Add-Type @"
	using System;
	using System.Runtime.InteropServices;
	using System.Text;

	public class WindowTools {
	[StructLayout(LayoutKind.Sequential)]
	public struct RECT {
	public int Left;

	#!/usr/bin/env bash

	ROKU_IP="192.168.1.167"
	ROKU_USER="rokudev"
	ROKU_PASSWORD="XXXXXXX"
	APP_FOLDER="app"
	DEST_FOLDER="dist"

	timestamp=$(date +%s)
	zipfile="../$DEST_FOLDER/rokuapp-$timestamp.zip"

	#!/bin/bash

	wget "https://nodejs.org/dist/v20.9.0/node-v20.9.0-linux-arm64.tar.xz"
	tar -xf node-v20.9.0-linux-arm64.tar.xz
	cd node-v20.9.0-linux-arm64
	sudo cp -R bin include lib share /usr/local/

	node -v
	npm -v

	#!/bin/bash

	ffprobe \
	-v error \
	-select_streams v \
	-show_entries frame=pict_type,pts_time \
	-of csv=p=0 \
	-skip_frame nokey \
	$INPUT_FILE > iframes.txt

	#!/bin/bash

	packager \
	'in=./tmp/output_540p.mp4,stream=video,init_segment=./tmp/output/video_3000_0/video_init.mp4,segment_template=./tmp/output/video_3000_0/video_$Number$.m4s' \
	'in=./tmp/output_720p.mp4,stream=video,init_segment=./tmp/output/video_1700_1/video_init.mp4,segment_template=./tmp/output/video_1700_1/video_$Number$.m4s' \
	'in=./tmp/output_1080p.mp4,stream=video,init_segment=./tmp/output/video_1200_2/video_init.mp4,segment_template=./tmp/output/video_1200_2/video_$Number$.m4s' \
	'in=./tmp/output_audio_128.mp4,stream=audio,language=en,roles=main,hls_name=main_en_2,init_segment=./tmp/output/audio_96_2/audio_init.mp4,segment_template=./tmp/output/audio_96_2/audio_$Number$.m4s' \
	'in=./tmp/output_audio_196.mp4,stream=audio,language=en,roles=main,hls_name=main_en_3,init_segment=./tmp/output/audio_64_3/audio_init.mp4,segment_template=./tmp/output/audio_64_3/audio_$Number$.m4s' \
	--fragment_duration 6 \
	--segment_duration 6 \

	#!/bin/bash

	BUILD_ID=$(date +"%s")

	SRC_DIR="MyApp"
	ZIP_FILE="dist/devbuild_$BUILD_ID.zip"
	ROKU_URL="http://192.168.1.167"
	ROKU_DEV_USER="rokudev"
	ROKU_DEV_PW="******"

	#!/bin/sh

	ffmpeg \
	-i "http://relay.publicdomainradio.org/classical.mp3" \
	-f lavfi \
	-re \
	-i testsrc=duration=120:size=1280x720:rate=24 \
	-map 0:0 \
	-map 1:0 \
	-c:v libx264 \