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FFmpeg cheat sheet

A list of useful commands for the ffmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

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使用ffmpeg合并MP4文件

ffmpeg -i "Apache Sqoop Tutorial Part 1.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i "Apache Sqoop Tutorial Part 2.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i "Apache Sqoop Tutorial Part 3.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate3.ts
ffmpeg -i "Apache Sqoop Tutorial Part 4.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate4.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts|intermediate4.ts" -c copy -bsf:a aac_adtstoasc "Apache Sqoop Tutorial.mp4"

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JSC

JSC is the JavaScript engine from Apple's JavaScriptCore (WebKit) as a console application that you can use to run script in the terminal.

For more info visit the JSC's webkit wiki page.

Adding a shortcut to JSC

Using jsc is simple, the one issue is that Apple keeps changing the location for jsc. To deal with this issue I just create a symbolic link to the binary:

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虽然距离第一次总结ffmpeg指令与剪辑视频相关的姿势 (github.com)已经过去了三年，但是依旧是非常业余的水平。仅作个人记录，谨慎参考，表述有问题的地方欢迎讨论指正。

视频剪切

需求是尽可能无损剪切，精确时间。

根据视频关键帧的情况，分两种方案

1. 极速方案，无损截取出视频两个关键帧之间的片段。

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#!/usr/bin/env python3
import subprocess
import json
import argparse
from os import listdir


filename = "ML2nd-day1-2.mp4"

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从零开始的程序员剪辑视频(误)

更佳markdown渲染样式，推荐使用PC web端阅读，查看原文，地址：https://git.io/fhSBj 代码地址：https://github.com/qq519043202/lrc2srt

一个懒惰却在某些方面爱折腾的程序员开始剪辑视频，不想安装任何大型编辑软件（我的破surface也带不动的感觉）

本文不适合：想要正经学习视频编辑的萌新，右转去学一些大型的编辑软件的使用吧~

本文适合：有计算机背景或爱折腾的视频剪辑萌新，要尝试鄙人的lrc转srt脚本或歌词获取脚本的旁友，不愿意装大型软件的视频萌新(?)

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var saveBlob = (function () {
    var a = document.createElement("a");
    document.body.appendChild(a);
    a.style = "display: none";
    return function (blob, fileName) {
        var url = window.URL.createObjectURL(blob);
        a.href = url;
        a.download = fileName;
        a.click();
        window.URL.revokeObjectURL(url);

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'use strict';

//npm install gulp gulp-minify-css gulp-uglify gulp-clean gulp-cleanhtml gulp-jshint gulp-strip-debug gulp-zip --save-dev

var gulp = require('gulp'),
	clean = require('gulp-clean'),
	cleanhtml = require('gulp-cleanhtml'),
	minifycss = require('gulp-minify-css'),
	jshint = require('gulp-jshint'),
	stripdebug = require('gulp-strip-debug'),

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node_version:=$(shell node -v)
npm_version:=$(shell npm -v)
timeStamp:=$(shell date +%Y%m%d%H%M%S)


.PHONY: install build archive test clean

show:
		@ echo Timestamp: "$(timeStamp)"
		@ echo Node Version: $(node_version)

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JavaFX

References

• JavaFX
• Say no to Electron! Using JavaFX to write a fast, responsive desktop application.
• What It Was Like to Write a Full-Blown Flutter App
• Google’s Flutter = React + Java Swing
• Multi vs Cross Platform in the age of Flutter