Update README.md

README.md

@@ -1,3 +1,128 @@
 ## MovieGo 📽
 
-MovieGo is a Golang library for video editing. The library is designed for fast processing of routine tasks related to video editing.
+MovieGo is a Golang library for video editing. The library is designed for fast processing of routine tasks related to video editing.
+
+### 🎥 Resize video in Golang
+
+Currently there are three methods in the package that help you resize the video:
+* `ResizeByWidth( new width )`
+* `ResizeByHeight( new height )`
+* `Resize( new width, new height )`
+
+```golang
+package main
+
+import (
+    "github.com/mowshon/moviego"
+)
+
+func main() {
+    first, _ := moviego.Load("forest.mp4")
+
+    first.ResizeByWidth(500).Output("resized-by-width.mp4").Run()
+    first.ResizeByWidth(150).Output("resized-by-height.mp4").Run()
+    first.Resize(1000, 500).Output("resized.mp4").Run()
+}
+```
+
+These commands in ffmpeg:
+
+```bash
+ffmpeg -i forest.mp4 -vf scale=500:210 resized-by-width.mp4 -y
+ffmpeg -i forest.mp4 -vf scale=150:62 resized-by-height.mp4 -y
+ffmpeg -i forest.mp4 -vf scale=1000:500 resized.mp4 -y
+```
+
+### 🎥 Cut video in Golang
+The `Video` structure has a `SubClip` method which can trim the video by specifying the beginning and end of the video segment.
+
+```golang
+package main
+
+import (
+    "github.com/mowshon/moviego"
+    "log"
+)
+
+func main() {
+    first, _ := moviego.Load("forest.mp4")
+
+    // Cut video from second 3 to second 5.
+    err := first.SubClip(3, 5).Output("final.mp4").Run()
+    if err != nil {
+        log.Fatal(err)
+    }
+}
+```
+
+### 🎥 Combine multiple videos into one in Golang
+Having several videos you can combine them into one. You can apply different effects to video clips from a slice at the same time.
+
+```golang
+func main() {
+    first, _ := moviego.Load("forest.mp4")
+    second, _ := moviego.Load("sky.mp4")
+
+    // Combine multiple videos into one.
+    finalVideo, err := moviego.Concat([]moviego.Video{
+        first,
+        second,
+        first.SubClip(1, 3),
+        second.SubClip(5.3, 10.5),
+        first.FadeIn(0, 5).FadeOut(5),
+    })
+
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    renderErr := finalVideo.Output("final.mp4").Run()
+    if err != nil {
+        log.Fatal(renderErr)
+    }
+}
+```
+
+### 🎥 Add a fade-in or fade-out transition for Video and Audio
+
+Here we have 4 methods for working with `Fade` effects. Two for video and two for audio tracks from the video.
+
+* `.FadeIn(start, duration)` - The video fade-in from the beginning (the screen is black) to the specified time interval.
+* `.FadeOut(seconds before the end)` - Fading video into a completely black screen. You need to specify in seconds from the end of the video when to start fading.
+* `.AudioFadeIn(start, duration)` - If you want the audio track to be completely muted at the beginning, you can specify the beginning at 0.5 seconds.
+* `.AudioFadeOut(seconds before the end)` - The audio track will fade out at the end depending on the specified interval in seconds to the end of the video.
+
+```golang
+func main() {
+    first, _ := moviego.Load("forest.mp4")
+
+    // Add fade-in and fade-out
+    first.FadeIn(0, 3).FadeOut(5).Output("fade-in-with-fade-out.mp4").Run()
+
+    // Cut video and add Fade-in
+    first.SubClip(5.20, 10).FadeIn(0, 3).Output("cut-fade-in.mp4").Run()
+
+    // Mute the sound for the first 0.5 seconds and then
+    // turn the sound on with the fade in.
+    first.AudioFadeIn(0.5, 4).Output("audio-fade-in.mp4").Run()
+
+    // Add video fade-out with audio fade-out.
+    first.FadeOut(5).AudioFadeOut(5).Output("fade-out.mp4").Run()
+}
+```
+
+### 🖼️ Screenshot - Saving a Frame of Video Clip in Golang
+
+You can make a screenshot by specifying the desired time from the video in seconds.
+
+```golang
+func main() {
+    first, _ := moviego.Load("forest.mp4")
+
+    // A simple screenshot from the video.
+    first.Screenshot(5, "simple-screen.png")
+
+    // Take a screenshot after applying the effects.
+    first.FadeIn(0, 3).FadeOut(5).Screenshot(0.4, "screen.png")
+}
+```