Convert live photos and videos into animated GIFs in iOS, or extract frames from them.
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README.md

NSGIF2 Awesome Stories in Ready

Create a GIF from the provided video file url, Or extract images from videos.

This repository has been separated from original repo along with some nontrivial different features, designs, and improvements. Please do diff each other, and visit original repo for more information if you need.

Installation

Framework Requirements

Accelerate.framework

There are 2 ways you can add NSGIF to your project:

Manual

Simply import the 'NSGIF' into your project then import the following in the class you want to use it:

#import "NSGIF.h"

From CocoaPods

pod "NSGIF2"

Usage - GIF from a video

Default request automatically set essential options such as the best frame count, delay time, output temp file name, or size. see interface file for more options.

Write 1 line to export

[NSGIF create:[NSGIFRequest requestWithSourceVideo:tempVideoFileURL] completion:^(NSURL *GifURL) {
    //GifURL is to nil if it failed or stopped.
}];

If you need more.

NSGIFRequest * request = [NSGIFRequest requestWithSourceVideo:tempVideoFileURL destination:gifFileURL];
request.progressHandler = ^(double progress, NSUInteger position, NSUInteger length, CMTime time, BOOL *stop, NSDictionary *frameProperties) {
    NSLog(@"%f - %lu - %lu - %lld - %@", progress, position, length, time.value, frameProperties);
};

[NSGIF create:request completion:^(NSURL *GifURL) {
    //GifURL is to nil if it failed or stopped.
}];

Interrupt process for given request

request.progressHandler = ^(double progress, NSUInteger position, NSUInteger length, CMTime time, BOOL *stop, NSDictionary *frameProperties) {
    BOOL cancelationCondition = YES;
    if(cancelationCondition){
        *stop = YES;
    }
};

Options - NSGIFRequest

/* required.
 * a file's url of source video */
@property(nullable, nonatomic) NSURL * sourceVideoFile;

/* optional.
 * defaults to nil.
 * automatically assign the file name of source video (ex: IMG_0000.MOV -> IMG_0000.gif)  */
@property(nullable, nonatomic) NSURL * destinationVideoFile;

/* optional but important.
 * Defaults to NSGIFScaleOptimize (not set).
 * This option will affect gif file size, memory usage and processing speed. */
@property(nonatomic, assign) NSGIFScale scalePreset;

/* optional but important.
 * Defaults to 4.
 * number of frames in seconds.
 * This option will affect gif file size, memory usage and processing speed. */
@property(nonatomic, assign) NSUInteger framesPerSecond;

/* optional but defaults is recommended.
 * Defaults is to not set.
 * How far along the video track we want to move, in seconds. It will automatically assign from duration of video and framesPerSecond. */
@property(nonatomic, assign) NSUInteger frameCount;

/* optional.
 * Defaults to 0,
 * the number of times the GIF will repeat. which means repeat infinitely. */
@property(nonatomic, assign) NSUInteger loopCount;

/* optional.
 * Defaults to 0.13.
 * unit is 10ms, 1/100s, the amount of time for each frame in the GIF.
 * This option will NOT affect gif file size, memory usage and processing speed. It affect only FPS. */
@property(nonatomic, assign) CGFloat delayTime;

/* optional.
 * Defaults is to not set. unit is seconds, which means unlimited */
@property(nonatomic, assign) NSTimeInterval maxDuration;

/* optional.
 * Defaults is to not set.
 * This option will crop(via AspectFill Mode) fast while create each images. Their size will be automatically calculated.
 * ex)
 *  square  : aspectRatioToCrop = CGSizeMake(1,1)
 *  16:9    : aspectRatioToCrop = CGSizeMake(16,9) */
@property(nonatomic, assign) CGSize aspectRatioToCrop;

/* optional.
 * Defaults is nil */
@property (nonatomic, copy, nullable) NSGIFProgressHandler progressHandler;

/* gif creation job is now proceeding */
@property(atomic, readonly) BOOL proceeding;

Usage - Extract each frames from a video to images.

NSFrameExtractingRequest * request = [NSFrameExtractingRequest requestWithSourceVideo:videoURL];
request.progressHandler = ^(double progress, NSUInteger offset, NSUInteger length, CMTime time, BOOL *stop, NSDictionary *frameProperties) {
    // normalized progress, Zero to 1.
};
request.framesPerSecond = 2;

[NSGIF extract:request completion:^(NSArray<NSURL *> *extractedFrameImageUrls) {
    //complete.
}];

Options - NSFrameExtractingRequest

/* required.
 * a file's url of source video */
@property(nullable, nonatomic) NSURL * sourceVideoFile;

/* optional.
 * defaults to temp directory.
 */
@property(nullable, nonatomic) NSURL * destinationDirectory;

/* optional.
 * Defaults to jpg.
 * This property will be affect to UTType(Automatically detected) of extracting image file.
 */
@property(nonatomic, readwrite, nullable) NSString * extension;

/* optional but important.
 * Defaults to NSGIFScaleOptimize (not set).
 * This option will affect gif file size, memory usage and processing speed. */
@property(nonatomic, assign) NSGIFScale scalePreset;

/* optional.
 * Defaults is to not set. unit is seconds, which means unlimited */
@property(nonatomic, assign) NSTimeInterval maxDuration;

/* optional but important.
 * Defaults to 4.
 * number of frames in seconds.
 * This option will affect gif file size, memory usage and processing speed. */
@property(nonatomic, assign) NSUInteger framesPerSecond;

/* optional but defaults is recommended.
 * Defaults is to not set.
 * How far along the video track we want to move, in seconds. It will automatically assign from duration of video and framesPerSecond. */
@property(nonatomic, assign) NSUInteger frameCount;

/* optional.
 * Defaults is to not set.
 * This option will crop(via AspectFill Mode) fast while create each images. Their size will be automatically calculated.
 * ex)
 *  square  : aspectRatioToCrop = CGSizeMake(1,1)
 *  16:9    : aspectRatioToCrop = CGSizeMake(16,9) */
@property(nonatomic, assign) CGSize aspectRatioToCrop;

/* optional.
 * Defaults is nil */
@property (nonatomic, copy, nullable) NSGIFProgressHandler progressHandler;

/* readonly
 * status for gif creating job 'YES' equals to 'now proceeding'
 */
@property(atomic, readonly) BOOL proceeding;

In the future, I will add a feature that can

  • create from a provided photo url.
  • perform simultaneous processing with provided specific chunk size.
  • seek for specific point.
  • generate infinite lengh of GIFs (Split with specific chunk size -> encoding -> merge each encoded piece of gifs.)
  • use APIs which is pefectly similar with PhotosKit of iOS.

Pull requests are more than welcomed!

License

Usage is provided under the MIT License. See LICENSE for the full details.