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Using FFprobe for video metadata

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@ -1,12 +1,6 @@
# Video-IO
A simple Video I/O library written in Go. This library relies on [FFMPEG](https://www.ffmpeg.org/), which must be downloaded before usage.
One of the key features of this library is it's simplicity: The FFMPEG commands used to read and write video are readily available in `videoio.go` for you to modify as you need. All functions placed in one file for portability.
## Documentation
Video-IO features `Video` and `VideoWriter` structs which can read and write videos.
A simple Video I/O library written in Go. This library relies on [FFmpeg](https://www.ffmpeg.org/), which must be downloaded before usage.
## `Video`
@ -19,15 +13,23 @@ for video.NextFrame() {
}
```
Notice that once the `video` is initialized, you will have access to certain metadata of the video such as the
* width (pixels)
* height (pixels)
* bitrate (kB/s)
* duration (seconds)
* frames per second
* video codec
* pixel format
```
type Video struct {
filename string
width int
height int
channels int
bitrate int
frames int
duration float64
fps float64
codec string
pix_fmt string
framebuffer []byte
pipe *io.ReadCloser
cmd *exec.Cmd
}
```
Once the frame is read by calling the `NextFrame()` function, the resulting frame is stored in the `framebuffer` as shown above. The frame buffer is an array of bytes representing the most recently read frame as an RGB image. The framebuffer is flattened and contains image data in the form: `RGBRGBRGBRGB...`.
@ -85,4 +87,5 @@ for video.NextFrame() {
# Acknowledgements
* Special thanks to [Zulko](http://zulko.github.io/) and his [blog post](http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/) about using FFMPEG to process video.
* Special thanks to [Zulko](http://zulko.github.io/) and his [blog post](http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/) about using FFmpeg to process video.
* The [ImageIO-FFMPEG](https://github.com/imageio/imageio-ffmpeg/) project on GitHub.