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marcduiker /
Last active Sep 30, 2020
CREATE: Serverless Homework
marcduiker / RetryCallsAndEscalate.cs
Created Sep 16, 2020
Possible solution to retry calls and escalate when the callee does not respond within a certain time.
View RetryCallsAndEscalate.cs
namespace DurableFunctions.Demo.DotNetCore.RetryCallsWithBackup
public class EscalatingCallsOrchestrator
public async Task RunEscalatingCallsOrchestrator(
[OrchestrationTrigger] IDurableOrchestrationContext context,
ILogger logger)
var escalatingCallsInput = context.GetInput<EscalatingCallsInput>();
marcduiker / EscalateCallsOrchestrator.cs
Created Sep 16, 2020
Escalate calls orchestrator with time out.
View EscalateCallsOrchestrator.cs
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.DurableTask;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace DurableFunctions.Demo.DotNetCore.EscalateCalls
marcduiker / ffmpeg_increase_audio_level
Last active Sep 15, 2020
Increase the audio level of an existing mp4 file with ffmpeg
View ffmpeg_increase_audio_level
ffmpeg -i input.mp4 -af "volume=10dB" -c:v copy -c:a aac -b:a 192k output.mp4
marcduiker / incremental_rename.ps1
Last active Aug 9, 2020
Incrementally rename files for ffmpeg
View incremental_rename.ps1
$files = Get-ChildItem "<Path where the pngs are>" -Filter *.png | Sort-Object
$fileCount = 0
$files |
Foreach-Object {
$currentFileNumber = [int]$_.BaseName.Substring($prefix.Length)
if ($currentFileNumber -ne $fileCount) {
$newFileFormat = "$prefix{0:d4}.png" -f $fileCount
Rename-Item $_.FullName $newFileFormat
marcduiker /
Last active Aug 10, 2020
FFmpeg command for creating video for Twitter

This FFmpeg command reads images named frame_[4 char digit].png and converts it to an mp4 using the h264 encoding which Twitter accepts. The bitrate is set to 5M to reduce blocking as much as possible. Reduce the bitrate to obtain a smaller file size.

ffmpeg -framerate 10 -i frame_%04d.png -c:v h264_qsv -b:v 5M video.mp4

marcduiker / set_kv__access_policy_for_function_app.ps1
Last active Jun 24, 2020
Azure CLI to add an access policy for a Function App to KeyVault
View set_kv__access_policy_for_function_app.ps1
$principalId = az functionapp identity show -n FUNC_APP_NAME -g RESOURCE_GROUP_NAME --query principalId
$appId = az ad sp show --id $principalId --query appId
az keyvault set-policy -n KEYVAULT_NAME --spn $appId --secret-permissions get
View MSBuild

My definition of serverless

My definition of serverless is that:

  • You don't have full responsibility of the infrastructure, which is a good thing.
  • Your resources should scale up and down automatically, based on the load.
  • You only pay for what you actually use, so the consumption model.


  • Glue code, connect services
View ServerlessDays Amsterdam Conference

Serverless Days Amsterdam Conference Script

This document contains the script for the online ServerlessDays Amsterdam Conferene. We're using a combination of OBS, Skype & NDI Tools to combine our streams. Streaming is done to which in turn forwards it to YouTube, Twitch and Periscope.


The lines in the script are prefixed with the role of the person who needs to undertake an action.

  • TECH = The person who's controlling OBS
View Speaker

Hi ServerlessDays speaker!

Here are the instructions for joining our conference on May 8th. Please read them through carefully so the experience on the conference day will be as smooth as possible. Another email will follow, which contains the exact time you need to be online during the conference.

There are three actions we ask you to do now:

  1. Read this entire message, yes, all of it!
  2. Send us your prerecorded session before Friday if you haven't done so already.
  3. Connect with our co-organizer, Marc Duiker, on Skype: m.duiker_1

Tech requirements

You can’t perform that action at this time.