leandromoreira

# webm - mp4
ffmpeg -hide_banner \
    -re -f lavfi -i "testsrc2=size=1280x720:rate=30,format=yuv420p" \
    -f lavfi -i "sine=frequency=220:beep_factor=4:duration=5" \
    -c:v libx264 -preset ultrafast -tune zerolatency -profile:v high \
    -b:v 1400k -bufsize 2800k -x264opts keyint=30:min-keyint=30:scenecut=-1 \
    -c:a aac -b:a 128k \
    -window_size 5  -extra_window_size 10 -remove_at_exit 1 -adaptation_sets "id=0,streams=v id=1,streams=a" \
    -fflags +genpts \
    -movflags isml+frag_keyframe output.mpd

montanaflynn

To reproduce Kong's benchmark please follow these instructions.

Create AWS Instances

Spin up three m3.medium EC2 ubuntu 14.04 instances with public DNS enabled and configure them for high network traffic by increasing these limits:

Added fs.file-max=80000 to /etc/sysctl.conf

Added the following lines to /etc/security/limits.conf

leandromoreira

% it creates a simple gray image (4x4)
I = [255, 255, 30, 100 
    255, 50, 90, 20 
    70, 70, 20, 10 
    100, 20, 10, 0];
% it converts it to grayscale
I = mat2gray(I);
% shows it 
imshow(I);

leandromoreira

function [ref_ii, ref_jj, blk_residual] = block_match(blk, frame)

% frame and block dimensions
[H, W] = size(frame);
blk_size = size(blk, 1);

ref_ii = 1;
ref_jj = 1;
err = (255 ^ 2) * (blk_size ^ 2);
blk_residual = 255 * ones(blk_size, blk_size);

rhettinger

'Emulate max() as fully as possible in pure Python.'

# https://stackoverflow.com/questions/69997857/implementation-of-max-function-in-python/69997876#69997876
# https://github.com/python/mypy/issues/7231

from typing import TypeVar, Any, Iterator, Iterable, Optional
from typing import Union, Protocol, Callable, cast, Tuple, overload


class SupportsGT(Protocol):

yohhoy

https://www.ffmpeg.org/doxygen/trunk/dump_8c_source.html#l00454

• fps = st->avg_frame_rate
• tbr = st->r_frame_rate
• tbn = st->time_base
• tbc = st->codec->time_base

AVStream::avg_frame_rate

Average framerate.

• demuxing: May be set by libavformat when creating the stream or in avformat_find_stream_info().
• muxing: May be set by the caller before avformat_write_header().

jbochi

jcemer

This is a proposal for a lightning talk at the Reactive 2016 conference. If you like this, star the Gist.

---

Thinking metrics on React applications

In regular websites, it is common to send multiple events to track user clicks. Single Page Applications change the way you look at metrics. This is a talk about a simple pattern we created at Globo.com to manage a metrics layer for http://globoplay.globo.com. The talk will cover how to track user flow using Google Analytics and other services. We solved the challenge of tying metrics and components, keeping information across pages and having global data. Also some React, React Router and React Side Effects concepts like context, higher order components, history state will be covered.

aktau

#!/bin/bash

# for a blogpost on this, check: http://www.aktau.be/2013/09/22/detecting-interlaced-video-with-ffmpeg/

# detect interlacing with the ffmpeg "idet" filter, the longer
# you let this run, the better, though it's never 100% accurate

# flags:
# -an            = discard audio, we don't need it
# -f rawvideo    = output raw video

oleksiiBobko

/*
    C socket server example, handles multiple clients using threads
    Compile
    gcc server.c -lpthread -o server
*/
 
#include<stdio.h>
#include<string.h>    //strlen
#include<stdlib.h>    //strlen
#include<sys/socket.h>