gifify-视频转GIF工具

gifify

Convert any video file to an optimized animated GIF. Either in its full length or only a part of it.

Demo time

This screencast was recorded withlolilolicon/FFcast then converted to a GIF with:

gifify screencast.mkv -o screencast.gif --resize 800:-1

Features

• command line interface
• programmatic JavaScript ( Node.JS ) stream interface
• unix friendly, supports stdin & stdout
• optimized! usespornel/giflossy to generate light GIFS
• lots of options: movie speed, fps, colors, compression, resize, from & to, subtitles
• no temp files used, everything happens in memory
• fast! Extracting a 5 seconds GIF from the middle of a 2 hours movie takes less than 20 seconds

Requirements

Before using gifify, please install:

• Node.js ( $ brew install node )
• FFmpeg :rooster: :rooster: :rooster: :rooster: ( $ brew install ffmpeg --with-libass --with-fontconfig )
• convert , the famous ImageMagick ( $ brew install imagemagick --with-fontconfig )
• pornel/giflossy, it's a gifsicle fork (waiting forgifsicle#16 to be merged) ( $ brew install giflossy )

You can also use thegifify Docker image which comes with everything installed.

Installation

npm install -g gifify

Command line usage

> gifify -h    Usage: gifify [options] [file]    Options:      -h, --help              output usage information     -V, --version           output the version number     --colors <n>            Number of colors, up to 255, defaults to 80     --compress <n>          Compression (quality) level, from 0 (no compression) to 100, defaults to 40     --from <position>       Start position, hh:mm:ss or seconds, defaults to 0     --fps <n>               Frames Per Second, defaults to 10     -o, --output <file>     Output file, defaults to stdout     --resize <W:H>          Resize output, use -1 when specifying only width or height. `350:100`, `400:-1`, `-1:200`     --speed <n>             Movie speed, defaults to 1     --subtitles <filepath>  Subtitle filepath to burn to the GIF     --text <string>         Add some text at the bottom of the movie     --to <position>         End position, hh:mm:ss or seconds, defaults to end of movie

Programmatic usage

See theexample.

var fs = require('fs'); var gifify = require('gifify'); var path = require('path');  var input = path.join(__dirname, 'movie.mp4'); var output = path.join(__dirname, 'movie.gif');  var gif = fs.createWriteStream(output);  var options = {   resize: '200:-1',   from: 30,   to: 35 };  gifify(input, options).pipe(gif);

You can also pass a readable stream to gifify(stream, opts) .

Readable stream input performance

Gifify supports streams both on command line ( cat movie.mp4 | gifify -o out.gif ) and in the programmatic API ( gifify(readableStream, opts).pipe(writableStream) ).

While it's super useful in some cases, if you have the file on disk already, you better do gifify movie.mp4 -o out.gif or gifify(filePath, opts).pipe(writableStream) .

Why? Because piping 3.4GB when you want to cut from 40:20 to 40:22 still takes a loooooot of time and does not give you any performance benefit.

FFmpeg has to read from 0GB -> $START_BYTE_40:20 and discards it. But everything flows in your memory.

When using direct file input from command line, we pass the -i filename option to FFmpeg and then it's super fast!

Be careful when |piping .

Adding some text

You can burn some simple text into your GIF:

gifify back.mp4 -o back.gif --from 01:48:23.200 --to 01:48:25.300 --text "What?..What?What?"

Result:

Subtitles

You can burn subtitles into your GIF, it's that easy:

gifify 22.mkv -o movie.gif --subtitles 22.ass --from 1995 --to 2002 --resize 600:-1

You must create new subtitles files, the timecodes for the complete film will not work for a five seconds GIF.

Create subtitles using aegisub and augment the font size for a great effect!

Here's the 22.ass from the previous command, created with aegisub:

[Script Info] ; Script generated by Aegisub 3.2.1 ; http://www.aegisub.org/ Title: Default Aegisub file ScriptType: v4.00+ WrapStyle: 0 ScaledBorderAndShadow: yes YCbCr Matrix: None  [Aegisub Project Garbage]  [V4+ Styles] Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1  [Events] Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text Dialogue: 0,0:00:02.50,0:00:03.97,Default,,0,0,0,,{/fnLiberation Sans/fs40}Okay, okay. Dialogue: 0,0:00:05.00,0:00:06.90,Default,,0,0,0,,{/fnLiberation Sans/fs40}Okay. Okay.

Result extracting a GIF from 22 Jump Street :

GIF Performance

On modern hardware GIF is the slowest and most expensive video codec. Can we please allow it to be obsoleted?

https://pornel.net/efficient-gifs#sec44

YOLO!

Giflossy

Giflossy is a fork of gifsicle , gifsicle author is currentlyworking on integrating the lossy part in gifsicle.

So in little time we will be able to directly use gifsicle and gifiscle packages.

Thanks

jclem/gifify was a great source of inspiration.