video2gif

A program used to convert video to gif with openCV.

Summary

video2gif is programmed to convert some most popular video format files into GIF. For now you can convert video files with its format in: .mp4, .avi, .rm, .rmvb, .mkv, to GIF files. You can also convert a picture to a static GIF image, supported file format including .jpg, .bmp. Transparent color is not supported for the moment.

Dependency

• Operating System: Windows only, suggesting Windows 8 or higher
• Compiler: Visual Studio 2010 or higher
• OpenCV: OpenCV 3+

Usage

The simplest way to use this program is:

video2gif yourvideofile

This command will generate a GIF file with original image size, a same FPS as video, a same name as video file. You can add some options to make your generated GIF file better.

Decide output filename

The ouput file can be given a name with the follow option:

-o yourname.gif

Resize image

Your can resize your output image with the command like:

-r 0.5

This will generate a GIF file with half width and height as original video. Notice that Enlarging the image is not supported now so a parameter larger then 1 will be ignored.

Setting FPS

You can set FPS of your file. Command:

-f 12

Given FPS should not be great than the original one.

Reset playing speed

Maybe you want to speed up or slow down your GIF file's playing speed, then you can use the command:

-s 1.1

This command will generate a GIF with its playing speed 1.1 times faster than original one. Notice that this will change your FPS setting, the real FPS is Speed Ratio multiple set FPS.

Cut a chapter

Maybe you just want to generate a GIF with just a part of your video instead of the whole one. The cut command gives you the option:

-c 120.5-121.5

you should provide 2 time points with their units second, connected by symbol '-'. The example command will generate GIF with input video start from 120.5s to 121.5s. Time point can be decimals. Notice that the time format 'hh:mm:ss' is not supported for now.

Use local color table

When the command

-l

is added, every frame will be quantized dividedly. This will make your file more colorful but larger.

Use key frame

The command

-k

will generate animated GIF with the first frame as its reference frame. Any other frame will cover over it while playing.

Help info

If you don't give any parameters(including input filename), then you'll get the full notice.