huynhthaihoa

About YUV formats

First of all: YUV pixel formats and Recommended 8-Bit YUV Formats for Video Rendering. Chromium's source code contains good documentation about those formats too: chromium/src/media/base/video_types.h and chromium/src/media/base/video_frame.cc (search for RequiresEvenSizeAllocation(), NumPlanes() and those kinds of functions).

YUV?

You can think of an image as a superposition of several planes (or layers in a more natural language). YUV formats have three planes: Y, U, and V.

Y is the luma plane, and can be seen as the image as grayscale. U and V are reffered to as the chroma planes, which are basically the colours. All the YUV formats have these three planes, and differ by the different orderings of them.

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

	## Workflow Orchestration

	### 1. Plan Node Default
	- Enter plan mode for ANY non-trivial task (3+ steps or architectural decisions)
	- If something goes sideways, STOP and re-plan immediately - don't keep pushing
	- Use plan mode for verification steps, not just building
	- Write detailed specs upfront to reduce ambiguity

	### 2. Subagent Strategy
	- Use subagents liberally to keep main context window clean

	/*
	* Convert from OpenCV image and write movie with FFmpeg
	*
	* Copyright (c) 2021 yohhoy
	*/
	#include <iostream>
	#include <vector>
	// FFmpeg
	extern "C" {
	#include <libavformat/avformat.h>

	import torch
	import torch.nn as nn


	def compute_scale_and_shift(prediction, target, mask):
	# system matrix: A = [[a_00, a_01], [a_10, a_11]]
	a_00 = torch.sum(mask * prediction * prediction, (1, 2))
	a_01 = torch.sum(mask * prediction, (1, 2))
	a_11 = torch.sum(mask, (1, 2))