CODEWITHSUNDEEP
javac++videompeg
Anonymous
Anonymous

Reputation: 3404

How can I convert a video file (mpeg, for example) into a collection of images?

How can I convert a video file (mpeg, for example) into a collection of images?

Ideal answer would cover both C++ and Java using available libraries, and also how to manually strip the individual frames out of a video file for some common video format.

Upvotes: 5

Views: 3472

Answers (3)

Dipan Mehta
Dipan Mehta

Reputation: 2160

Probably you can use apiexample.c inside the ffmpeg's libavcodec library that will allow you to see how to take a frame buffer to encode it in the mpeg stream easily.

Alternatively you can use Gstreamer which is a much neater framework.

For Java, try to use Java Media Framework.

Upvotes: 0

Don Reba
Don Reba

Reputation: 14031

You can do this using ffmpeg with -vcodec png. For example, this would convert my_video.avi into frames with five-digit numbers:

ffmpeg -i my_video.avi -vcodec png frame%05d.png

You can also need to specify desired framerate and resolution. You can run ffmpeg -codecs to see all the available formats.

Upvotes: 3

Mechanical snail
Mechanical snail

Reputation: 30647

To extract all frames losslessly, use

ffmpeg -i "$input_file" -f image2 "outdir/%05d.png"

If you prefer a different output format, just change .png; by default ffmpeg will infer the file type from the extension.

The option -f image2 tells ffmpeg to write to a series of images. The "outdir/%05d.png" gives a filename pattern, in this case "5-digit frame number.png".

If you only want to extract n frames per second, add the option -r n after "$input_file". (I think n can be floating-point.)

In the case that your video is Motion JPEG (mjpeg), instead use:

ffmpeg -i "$input_file" -vcodec copy -f image2 "outdir/%05d.jpg"

This unpacks the frames directly from the video stream, which is faster and obviously uses less disk space.

For more information/other options, see the man page or the documentation (search for image2).

Upvotes: 6

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