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FastAPI and Uvicorn Logging

When running FastAPI app, all the logs in console are from Uvicorn and they do not have timestamp and other useful information. As Uvicorn applies python logging module, we can override Uvicorn logging formatter by applying a new logging configuration.

Meanwhile, it's able to unify the your endpoints logging with the Uvicorn logging by configuring all of them in the config file log_conf.yaml.

Before overriding:

uvicorn main:app --reload

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Gstreamer Pipeline Samples

Table of Contents:

• Gstreamer Pipeline Samples
  • Tips for Debug
  • Video
    • display test video
    • record to file
• record and display at the same time(queue)

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#!/usr/bin/python3
#-*- coding: utf-8 -*-

import logging
import timeit
import traceback
import time

import gi
gi.require_version('Gst', '1.0')

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"""A simple whoami server to analyze incoming HTTP requests

# For simplicity, we don't do:
# 1. Detect End of HTTP Request either by double CRLF(`\r\n\r\n`) or `Content-Length`.
# 2. Parse the HTTP request message.
# Instead, we just do:
# 1. Read max size of `GET` and `POST` requests data is 4096 bytes.
# 2. Close the connection for each request.
"""

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---

authors:

• frank tags:
• Python
• Unicode
• ctypes description: Python Unicode keywords:
• Python Unicode

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Build OpenCV in Mac with QT, Gstreamer Support

Install dependencies

brew install cmake #
brew install qt5 #optional
brew install gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly gst-libav #optional
pip3 install numpy

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FFmpeg Samples

FFmpeg Wiki

List private options of the codec

# Show available `presets`
ffmpeg -h encoder=h264_nvenc

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SSH Login Setup

1. Generate ssh key

# Generate ssh key with files(~/.ssh/id_rsa, ~/.ssh/id_rsa/pub) and username in default
ssh-keygen -t rsa

# Generate ssh key with specified files and username
ssh-keygen -t rsa -f ~/.ssh/[KEY_FILENAME] -C [USERNAME]

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Check Universal App Is Running as Native or Translated Binrary

On Apple silicon, arm app is running as native binary and x86_64 app is translated by Rosseta before executing.

Make Test Demo

❯ clang -o arm_proc_translated proc_translated.c -target arm64-apple-macos11
❯ clang -o x86_64_proc_translated proc_translated.c -target x86_64-apple-macos11
❯ lipo -create -output universal_proc_translated x86_64_proc_translated arm_proc_translated

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# Enable Powerlevel10k instant prompt. Should stay close to the top of ~/.zshrc.
# Initialization code that may require console input (password prompts, [y/n]
# confirmations, etc.) must go above this block; everything else may go below.
if [[ -r "${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${(%):-%n}.zsh" ]]; then
  source "${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${(%):-%n}.zsh"
fi

# If you come from bash you might have to change your $PATH.
# export PATH=$HOME/bin:/usr/local/bin:$PATH