Erich Ocean erichocean

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

To me, "require-and-automatically-visible" is violating the beauty of namespace. But, maybe I felt this way because I don't understand Clojure's registry or how require works.

I thought about this more, and I think I have a better understanding of why this feels strange. Clojure has one thing called "namespaces" which are clojure.lang.Namespace objects created by the ns macro. Functionally speaking they are a storage location which mostly just contain vars and references to vars in other namespaces. They are used for code organization: specifically for organizing vars and occasionally Java classes and interfaces.

Clojure also has a completely different thing called "namespaces" which are prefixes that get attached to keywords and symbols. These can interact with ns namespaces thru the reader in a handful of ways (for instance, ::double-colon keywords and symbols inside backtick forms are resolved according to the current clojure.lang.Namespace) but for the most part should be considered a di

	If you've got something like this:

	file was built for arm64 which is not the architecture being linked (x86_64):

	Than this gist is for you.

	Let's say you have already developed the framework itself and just want to build the binary
	and distribute it through the Cocoapods.

	1. Make sure your framework "Deployment Target" is equal to all the dependencies from your podspec file.

	// NOTE: ignore the .cpp extension on the filename - this is VEX
	// but I couldn't find a gist-friendly way to syntax-hilight it
	// ¯\_(ツ)_/¯
	//
	// h's magic adaptive point resizer for optimal
	// rendering of tiny points/particles/wires
	//
	// 1/2/2018 [email protected]
	// CC-0 - use and abuse

	-- Redis script to implement a leaky bucket
	-- see https://medium.com/callr-techblog/rate-limiting-for-distributed-systems-with-redis-and-lua-eeea745cb260
	-- (c) Florent CHAUVEAU <[email protected]>

	local ts = tonumber(ARGV[1])
	local cps = tonumber(ARGV[2])
	local key = KEYS[1]

	-- remove tokens < min (older than now() -1s)
	local min = ts -1

	-- Redis script to get the size of a token bucket
	-- see https://medium.com/callr-techblog/rate-limiting-for-distributed-systems-with-redis-and-lua-eeea745cb260
	-- (c) Florent CHAUVEAU <[email protected]>

	local ts = tonumber(ARGV[1])
	local key = KEYS[1]

	-- remove tokens < min (older than now() -1s)
	local min = ts -1

	-- Redis script to add an event to a token bucket
	-- see https://medium.com/callr-techblog/rate-limiting-for-distributed-systems-with-redis-and-lua-eeea745cb260
	-- (c) Florent CHAUVEAU <[email protected]>

	local ts = tonumber(ARGV[1])

	-- set the token bucket to 1 second (rolling)
	local min = ts -1

	-- iterate overs keys

	#include <metal_stdlib>
	using namespace metal;

	struct VertexIn {
	float2 position [[attribute(0)]]; // varies per-vertex
	float4 color [[attribute(1)]]; // varies per-instance
	float3 center [[attribute(2)]]; // varies per-instance
	float radius [[attribute(3)]]; // varies per-instance
	};

	;; # EMULATING DATOMIC EXCISION VIA MANUAL DATA MIGRATION


	;; *************************************
	;; ## Introduction
	;; *************************************

	;; This Gist demonstrates a generic way to migrate an entire Datomic database
	;; from an existing 'Origin Connection' to a clean 'Destination Connection',
	;; while getting rid of some undesirable data and otherwise preserving history.

	global
	log 127.0.0.1 local0 notice
	maxconn 4096
	user haproxy
	group haproxy
	ssl-server-verify none

	defaults
	log global
	mode http