500-video-processing

500-video-processing

In this example, we will extract audio (mp3) from a YouTube video using youtubbe-dl and ffmpeg.

However instead of downloading the entire video to our computer and keeping our CPU busy, we can offload this work to cloud using dexec:

youtube-dl [url] -o - | ffmpeg -i pipe:0 -f mp3 pipe:1

Then, we save the STDOUT of this command to music.mp3.

Sorry for teaching you how to pirate music, I couldn’t find a better example.

To run this example:

$ docker pull vimagick/youtube-dl
$ go run main.go
(play music.mp3)

Migration from os/exec

Again, just 5 lines (after 4 examples, you’re not surprised, right?):

> 	cl, _ := docker.NewClientFromEnv()
> 	d := dexec.Docker{cl}
> 
> 	m, _ := dexec.ByCreatingContainer(docker.CreateContainerOptions{
> 		Config: &docker.Config{Image: "vimagick/youtube-dl"}})
< 	cmd := exec.Command("sh", "-c", fmt.Sprintf("youtube-dl %s -o - | ffmpeg -i pipe:0 -f mp3 pipe:1", url))
> 	cmd := d.Command(m, "sh", "-c", fmt.Sprintf("youtube-dl %s -o - | ffmpeg -i pipe:0 -f mp3 pipe:1", url))