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ffmpeg: Rotate video

ffmpeg -i in.mov -vf "transpose=1" out.mov

For the transpose parameter you can pass:

• 0 = 90 Counter Clockwise and Vertical Flip (default)
• 1 = 90 Clockwise
• 2 = 90 Counter Clockwise

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Delete multiple git branches

Delete all branches with fix prefix

git branch | grep fix | xargs git branch -D

Delete all branches with feat prefix

git branch | grep feat | xargs git branch -D

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How to download zoom recordings

youtube-dl -o output-filename.mp4 --referer "https://zoom.us/" --add-header "Cookie: <Header cookie>" "<General Request URL>"

When you visit the Zoom recording that you want to download.

• Go to the url of the recording you want to download and open the browsers developer tools by pressing Ctrl + Shift + I or F12.
• Click on the Network tab on the developer tools
• Refresh the page Ctrl+R or F5.
• Search for .mp4 in the search box of the developer tools.

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sudo pkill -9 coreaudiod

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iOS. Record simulator screen

xcrun simctl io booted recordVideo myVideo.mov

Options

You can specify the following options to the command.

• --codec Specifies the codec type: "h264" or "hevc". Default is "hevc".

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ffmpeg: Transform to mp4 and resize to width=300px

ffmpeg -i input.webm -filter:v scale="300:trunc(ow/a/2)*2" -vcodec h264 -an output.mp4

-an means no sound

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Android emulator. Reduce CPU usage on MacOS

I wasn't able to shut the audio off with the config.ini file, but only with the -noaudio cmd line argument to qemu. However, with Android Studio 3.2, you can't add custom arguments to the emulator, so I made this:

In the emulator dir of the Android SDK, in my case ~/Android/Sdk/emulator/

mv emulator emulator.orig Make a bash script called emulator with the content:

#!/bin/bash

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Git: Rebase

From your feature branch:

git fetch
git rebase origin/master

If any conflict shall arise, resolve them one by one. Once all conflicts are dealt with:

git rebase --continue

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Dart: Create project

dart create -t console-simple project_name

Available templates:

• console-simple: A simple command-line application. (default)
• console-full: A command-line application sample.
• package-simple: A starting point for Dart libraries or applications.
• web-simple: A web app that uses only core Dart libraries.

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Flutter: Create project, library or plugin

• create project

flutter create --org com.example.project.name  --androidx -i swift -a kotlin --description 'Description goes here' flutter_project_name

• create library/package

flutter create --org com.example.package.name  --description 'Description goes here' --template=package flutter_package_name

• create plugin