golang ffmpeg transcoding

With the continuous advancement of the development of the Internet, audio and video content has become an important part of people's daily life. For audio and video processing, transcoding is an indispensable part. In the field of transcoding, golang and ffmpeg are both excellent tools. This article will introduce how to use golang combined with ffmpeg for audio and video transcoding, aiming to help readers better understand this field.

1. Introduction to golang

Golang is an emerging programming language and a compiled language developed by Google. It has many excellent features such as static typing, automatic garbage collection, and concurrent programming features. It is very suitable for network programming and the development of high-performance applications.

2. Introduction to FFmpeg

FFmpeg is a powerful audio and video conversion tool. It not only supports almost all common audio and video formats, but also can perform format conversion and media stream processing. FFmpeg is open source, free, and cross-platform. It is a good choice in the field of audio and video processing.

3. Combined use of golang and FFmpeg

Since golang and FFmpeg are both excellent tools, their combined use in actual development can enable us to complete the transcoding task more efficiently. Specifically, we can use golang to call FFmpeg, making the transcoding process simpler and more convenient.

1. Installing FFmpeg

Before using FFmpeg for transcoding, we need to install it first. The specific installation steps are as follows:

(1) Download FFmpeg:

The official website of FFmpeg is https://ffmpeg.org/download.html. Just select the corresponding version from the official website to download. .

(2) Decompress the installation package:

Decompress the downloaded FFmpeg installation package to get the FFmpeg program.

(3) Configure environment variables:

Add the path of the FFmpeg program to the system environment variable so that we can call FFmpeg through the terminal at any location. The specific method is as follows:

export PATH="$PATH:/path/to/ffmpeg/bin"

The above is the configuration method of Linux system. Under Windows system, it needs to be manually added to the system environment variables.

2. Calling FFmpeg

In golang, we can call the FFmpeg program through the os/exec package. The specific method is as follows:

package main
 
import (
    "os/exec"
)
 
func main() {
    cmd := exec.Command("ffmpeg", "-i", "input.mp4", "output.mp4")
    err := cmd.Run()
    if err != nil {
        panic(err)
    }
}

The above code will call the FFmpeg command to convert a file named "input.mp4" into an "output.mp4" file.

3. Optional settings

In actual development, we usually need to set the parameters in the transcoding process to adjust the transcoding effect. The following are some commonly used parameters and their meanings:

(1) -i: Specify the input file name

(2) -s: Specify the video resolution

(3 ) -r: Specify the frame rate

(4) -vcodec: Specify the video encoder

(5) -acodec: Specify the audio encoder

(6) -ab ：Specify the audio bit rate

(7)-ar ：Specify the audio sampling rate

(8)-f ：Specify the output format

(9)-b ：Specify the video Code rate

(10)-y: If the output file already exists, the file is forced to be overwritten

The following is a sample code that demonstrates how to set some transcoding parameters:

package main
 
import (
    "os/exec"
)
 
func main() {
    cmd := exec.Command("ffmpeg", "-i", "input.mp4", "-s", "1920x1080", "-b", "800k", "-vcodec", "libx264", "-strict", "-2", "-acodec", "aac", "-ab", "128k", "-ar", "48000", "-f", "mp4", "-y", "output.mp4")
    err := cmd.Run()
    if err != nil {
        panic(err)
    }
}

The above code will convert a file named "input.mp4", set the video resolution to 1920x1080, the video bit rate to 800k, the video encoder to libx264, the audio encoder to aac, and the audio bit rate to 128k. The audio sampling rate is 48000, the output format is mp4, and the output file "output.mp4" is forced to be overwritten.

4. Summary

This article introduces how to use golang combined with ffmpeg to transcode audio and video. By using golang, we can call the ffmpeg program more conveniently to complete the audio and video transcoding task. In actual development, you can also adjust the transcoding effect by setting transcoding parameters to get a better user experience. The above are just some examples, readers can explore and try more according to their own needs.

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