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Using VAAPI's hardware accelerated video encoding on Linux with Intel's hardware on FFmpeg and libav

Hello, brethren :-)

As it turns out, the current version of FFmpeg (version 3.1 released earlier today) and libav (master branch) supports full H.264 and HEVC encode in VAAPI on supported hardware that works reliably well to be termed "production-ready".

preface: Posting these online since it sounds like these notes are somewhat interesting based on a few folks I've shared with. These are semi-rough notes that I basically wrote for myself in case I ever needed to revisit this fix, so keep that in mind.

I recently bought an LG ULTRAGEAR monitor secondhand off of a coworker. I really love it and it's been great so far, but I ran into some minor issues with it in Linux. It works great on both Mac and Windows, but on Linux it displays just a black panel until I use the second monitor to go in and reduce the refresh rate down to 60 Hz.

This has worked decent so far but there's some issues:

It doesn't work while linux is booting up. The motherboards boot sequence is visible just fine, but as soon as control is handed over to Linux and I'd normally see a splash screen while I'm waiting for my login window, I see nothing.
It doesn't work on the login screen. This would be fine if login consistently worked on my second screen, but I need to manually switch

	urlencode() {
	# urlencode <string>

	old_lc_collate=$LC_COLLATE
	LC_COLLATE=C

	local length="${#1}"
	for (( i = 0; i < length; i++ )); do
	local c="${1:$i:1}"
	case $c in

	#define _LARGEFILE64_SOURCE

	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <errno.h>
	#include <time.h>
	#include <signal.h>
	#include <sys/fcntl.h>
	#include <sys/ioctl.h>

	#!/usr/bin/env python3

	# A simple script to build 64-bit and 32-bit Mesa and libdrm on amd64 Debian
	# stable, Debian testing, Debian unstable, and possibly some Ubuntu versions
	# with some tweaks.
	#
	# libdrm is build too, because often version right now in Debian sid and experimental
	# is too old for current mesa git repo. Also it is nice to build debug
	# versions of libdrm when troubleshooting some crashes and bugs.
	#