Guilherme Roberge Daleffe daleffe

Live Transcoding

This is a collection of working commandline examples to show how one could use FFMpeg and VLC for live transcoding of video streams. All examples have been tested on OSX 10.7.5 with FFMPeg 1.1.3 and VLC 2.0.5 in early 2013.

Documentation links

Use ffmpeg to stream video from a dahua 4300s to a file or files

You can use ffmpeg to directly pull frames off of a dahua 4300s at full resolution. May be a good alternative to pricey dvrs which likely cannot record at full resolution, may not work with the camera, or are prohibitevly expensive

Simple Stream to file

Simple stream to file. Full resolution

ffmpeg -loglevel debug -rtsp_transport tcp -i "rtsp://admin:[email protected]:554/live" \

-c copy -map 0 foo.mp4

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

	# dmesg \| grep corrupt
	[ 21.280705] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
	# umount /boot
	# git clone http://daniel-baumann.ch/git/software/dosfstools.git

	# cd dosfstools

	# make
	cc -O2 -fomit-frame-pointer -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Wno-sign-compare -Wno-missing-field-initializers -Wmissing-prototypes -Wstrict-prototypes -g -c -o fatlabel.o src/fatlabel.c
	.

	/*
	* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
	* Digest Algorithm, as defined in RFC 1321.
	* Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
	* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
	* Distributed under the BSD License
	* See http://pajhome.org.uk/crypt/md5 for more info.
	*/

	/*

	#!/bin/bash
	set -e

	# trap keyboard interrupt (control-c)
	trap control_c INT

	# Must be run as root
	# requires:
	# - wget
	# - pax

	public class RC4 {

	public static byte[] Encrypt(byte[] pwd, byte[] data) {
	int a, i, j, k, tmp;
	int[] key, box;
	byte[] cipher;

	key = new int[256];
	box = new int[256];
	cipher = new byte[data.Length];

	# https://trac.ffmpeg.org/wiki/Capture/Desktop
	# https://ffmpeg.org/ffmpeg-devices.html#gdigrab
	# https://trac.ffmpeg.org/wiki/Encode/H.264#LosslessH.264

	# WARNING: THE RECORDING WILL STOP WHEN UAC POPUP IS SHOWN

	C:\SoftPortable\ffmpeg\bin\ffmpeg `
	-f gdigrab -framerate 30 -draw_mouse 1 -i desktop `
	-c:v libx264 -qp 0 -pix_fmt yuv444p -preset ultrafast `
	"C:\Videos\recording-$(get-date -f yyyy-MM-dd-Hmss).mp4"

	### Problem
	On Archlinux

	`journalctl -p 3 -xb`

	shows

	`intel_rapl: no valid rapl domains found in package 0`

	### Slove