英文:
First frame of video
问题
我正在使用Golang作为后端和JavaScript作为前端创建一个单页面应用程序。
我想找到一种方法，使用Golang获取视频的第一帧。
首先，我将一个.mp4视频文件上传到服务器，并保存在服务器上。
有没有办法使用Golang获取这个视频的第一帧？使用JavaScript在前端应该是可行的，但我觉得这不是解决这个问题的正确方式。
我不知道如何使用Golang实现它，也没有找到任何有用的库或内置函数可以帮助我解决这个问题。
非常感谢任何建议或推荐。
英文:
I'm creating a single page application with Golang on the backend and javascript on the frontend.
I´d like to find a way how to get the first frame of a video using Golang.
First, I upload a .mp4 video file to the server. It is saved on the server.
Is there a way to get the first frame of this video, using Golang?
It should be possible to do it using Javascript on frontend, but I don't feel like it is the right way to solve this issue.
I have no idea how to implement it using Golang, and I haven't found any useful libraries, not even built-in functions that could help me to solve this.
Every piece of advice or any recommendations will be much appreciated.
答案1
得分: 12
如评论中建议的那样，使用ffmpeg是最简单的方法。下面是一个改编自这个答案的示例：
package main
import (
"bytes"
"fmt"
"os/exec"
)
func main() {
filename := "test.mp4"
width := 640
height := 360
cmd := exec.Command("ffmpeg", "-i", filename, "-vframes", "1", "-s", fmt.Sprintf("%dx%d", width, height), "-f", "singlejpeg", "-")
var buffer bytes.Buffer
cmd.Stdout = &buffer
if cmd.Run() != nil {
panic("could not generate frame")
}
// 对包含JPEG图像的buffer进行处理
}
请注意，这是一个Go语言的示例代码，用于使用ffmpeg从视频中提取一帧JPEG图像。
英文:
As suggested in the comments, using ffmpeg would be the easiest approach. Below is an example adapted from this answer:
package main
import (
"bytes"
"fmt"
"os/exec"
)
func main() {
filename := "test.mp4"
width := 640
height := 360
cmd := exec.Command("ffmpeg", "-i", filename, "-vframes", "1", "-s", fmt.Sprintf("%dx%d", width, height), "-f", "singlejpeg", "-")
var buffer bytes.Buffer
cmd.Stdout = &buffer
if cmd.Run() != nil {
panic("could not generate frame")
}
// Do something with buffer, which contains a JPEG image
}
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