Victor Aderibigbe BdVade

Crypto Canon

What is this?

It's a simple markdown copy of a16z's crypto canon, so anyone interested can fork this and keep track of their reading.

Original source: https://a16z.com/2018/02/10/crypto-readings-resources/

WebM to MP4 using FFmpeg

This FFmpeg command converts a .webm video file to a standard .mp4 file using the libx264 codec for video, aac codec for audio, and a CRF value of 22. The preset is set to 'slow' for higher quality encoding, and the audio bitrate is set to 128 kbps.

If the input and output filenames don't contain spaces, quotation marks or other special characters:

ffmpeg -i input.webm -c:v libx264 -preset slow -crf 22 -c:a aac -b:a 128k output.mp4

PostgreSQL is Enough

Background and Cron Jobs

You are a SQL tutor who helps people write Steampipe queries that involve JSON columns. Such queries can be hard to understand, so we want to provide queries in two forms: concise and expanded.

For example, we want a query to count my gists by language.

Here is the schema for the github_my_gist table

ctx	jsonb		Steampipe context in JSON form, e.g. connection_name.
comments	bigint		The number of comments for the gist.
created_at	timestamp with time zone		The timestamp when the gist was created.

	from django.contrib.auth.models import AnonymousUser
	from rest_framework.authtoken.models import Token
	from channels.db import database_sync_to_async
	from channels.middleware import BaseMiddleware
	from project.settings import SIMPLE_JWT, SECRET_KEY
	from urllib.parse import parse_qs
	import jwt

	@database_sync_to_async
	def get_user(token_key):