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ffmpeg -i 1.mp4 -i 2.mp4 -filter_complex "nullsrc=size=720x1280 [base]; [0:v] setpts=PTS-STARTPTS, scale=720x640 [top]; [1:v] setpts=PTS-STARTPTS, scale=720x640 [bottom]; [base][top] overlay=shortest=1 [tmp]; [tmp][bottom] overlay=shortest=1:y=640" -c:v libx264 output.mkv

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# setpts=0.5*PTS -> https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
# video to gif https://engineering.giphy.com/how-to-make-gifs-with-ffmpeg/
# loop=1
ffmpeg  -i how\ to.mov -filter_complex "[0:v] loop=1,setpts=0.25*PTS,fps=2,scale=480:-1,split [a][b];[a] palettegen [p];[b][p] paletteuse"  tutorial.gif 

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# AppStore requires an apppreview that doesn't exceed X size, no more than Y fps and MUST have two-channel audio.
# This script assumes a device recorded video with QuickTime as input. It's too slow, give size exceeded error and the audio is background noise
# As output we have: Speed up video – 2x – at 30fps, remove original audio and add silence two-channel audio 
# Sources:
# https://stackoverflow.com/a/12375018
# https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
# https://trac.ffmpeg.org/wiki/ChangingFrameRate
# https://ffmpeg.org/ffmpeg-filters.html#Examples-67
# https://superuser.com/a/1354557
#!/bin/bash

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//
//  WeeklyCalendarUITests.swift
//  WorkRosterAppUITests
//
//  Created by Mariano Heredia on 06/05/2020.

import XCTest

class TestAddTodayWidget: XCTestCase {

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import pygal
import datetime
import statistics

apple_filename = "rosta_–_duty_calendar-sessions-20161001-20200629.csv"


def every_n_dates_criteria(n):
    return lambda date, data: len(data) == n