bcambel

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:

bcambel

'use strict';
console.log('Loading function');

exports.handler = (event, context, callback) => {
    /*Print streams as source only data here*/
    event.records.forEach((record) => {
        console.log(record.kinesisRecordMetadata.sequenceNumber);
        console.log(record.kinesisRecordMetadata.subsequenceNumber);
        console.log(record.kinesisRecordMetadata.partitionKey);
        console.log(record.kinesisRecordMetadata.shardId);

bcambel

{
  "StreamName": "$input.params('stream-name')"
}

bcambel

{
  "StreamDescription": {
    "EncryptionType": "NONE",
    "EnhancedMonitoring": [
      {
        "ShardLevelMetrics": []
      }
    ],
    "HasMoreShards": false,
    "RetentionPeriodHours": 24,

bcambel

{
    // the templates argument that will be replaced from the URL 
    // <api>/Stream/{stream-name}
    "StreamName": "$input.params('stream-name')",
    // Data that we received + a NEW LINE Base64 encoded (Cg==)
    "Data": "$util.base64Encode($input.json('$.Data'))Cg==",
    "PartitionKey": "$input.path('$.PartitionKey')"
}

bcambel

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

bcambel

# Required downloads:
sudo wget http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1404/x86_64/cuda-repo-ubuntu1404_8.0.44-1_amd64.deb
# NVIDIA-Linux-x86_64-367.27.run
# cuda_8.0.27_linux.run
# cudnn-8.0-linux-x64-v5.0-ga.tgz

sudo apt-get install build-essential
sudo apt-get install linux-image-extra-`uname -r`
sudo ./NVIDIA-Linux-x86_64-367.27.run
./cuda_8.0.27_linux.run --extract=`pwd`/extracts

bcambel

#!/bin/bash

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
echo debconf shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections; echo debconf shared/accepted-oracle-license-v1-1 seen true | sudo debconf-set-selections creates=/usr/lib/jvm/java-8-oracle
sudo apt-get install oracle-java8-installer ca-certificates oracle-java8-set-default  -y

bcambel

#!/bin/bash
VERSION="1.11.2.2"
wget https://openresty.org/download/openresty-${VERSION}.tar.gz
wget https://openresty.org/download/openresty-${VERSION}.tar.gz.asc
gpg --keyserver pgpkeys.mit.edu --recv-key A0E98066
gpg openresty-${VERSION}.tar.gz.asc
gpg openresty-${VERSION}.tar.gz.asc
tar -xvf openresty-${VERSION}
cd openresty-${VERSION}
sudo apt-get install build-essential libreadline-dev libncurses5-dev libpcre3-dev libssl-dev perl -y

bcambel

(with-open [file-stream (FileInputStream. ten-gb-filename)]
  (let [channel (chan 500)
        ;; make four workers to read byte arrays off the channel:
        counters (for [_ (range 4)] 
                   (go-loop [newline-count 0]
                     (let [barray (async/<! channel)]
                       (if (nil? barray) ;; channel is closed
                         newline-count
                         (recur (+ newline-count
                                   (count-newlines barray)))))))]