前言

本文提供将视频中音频提取出来存为mp3格式，一如既往的实用主义。

主要也是学习一下golang使用ffmpeg工具的方式。

环境依赖

ffmpeg环境安装，可以参考我的另一篇文章：windows ffmpeg安装部署_阿良的博客-CSDN博客

本文主要使用到的不是ffmpeg，而是ffprobe也在上面这篇文章中的zip包中。

golang主要依赖库

github.com/u2takey/ffmpeg-go

代码

不废话，上代码。下面为功能实现的主要代码。

package main

import (
	"fmt"
	"github.com/gofrs/uuid"
	"github.com/google/logger"
	ffmpeg "github.com/u2takey/ffmpeg-go"
	"path/filepath"
	"strings"
)

func InFormat1(target string, str_array []string) bool {
	for _, element := range str_array {
		if target == element {
			return true
		}
	}
	return false
}

//提取MP3
func ExtractMp3(inputVideoPath, outputDir string) string {
	_formatArr := []string{"mp4", "flv"}
	_, _file := filepath.Split(inputVideoPath)
	_tmps := strings.Split(_file, ".")
	_ext := _tmps[len(_tmps)-1]
	if !InFormat1(_ext, _formatArr) {
		logger.Fatal("格式不支持")
	}
	_name, err := uuid.NewV4()
	if err != nil {
		logger.Fatal(err)
	}
	_resultVideoPath := filepath.Join(outputDir, fmt.Sprintf("%s.%s", _name.String(), "mp3"))
	err = ffmpeg.Input(inputVideoPath).
		Output(_resultVideoPath, ffmpeg.KwArgs{"acodec": "libmp3lame"}).
		OverWriteOutput().ErrorToStdOut().Run()
	if err != nil {
		logger.Fatal(err)
	}
	return _resultVideoPath
}


func main() {
	_extractMp3 := ExtractMp3("E:\\360MoveData\\Users\\xxx\\Desktop\\3333333.mp4", "E:\\360MoveData\\Users\\xxx\\Desktop")
	fmt.Println(_extractMp3)
}

日志工具代码如下，非必要。

package logutil

import (
	"github.com/google/logger"
	"os"
)

var pLogger *logger.Logger

// Init init logger
func Init(verbose, systemLog bool, logPath string) {
	file, err := os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0660)
	if err != nil {
		logger.Fatalf("logger Init: open log file(%v) error(%v)", logPath, err)
	}
	pLogger = logger.Init("FFmpegDemoLogger", verbose, systemLog, file)
}

// Close close logger
func Close() {
	pLogger.Close()
}

代码说明

1、ExtractMp3方法参数分别为，输入视频地址、输出mp3目录地址值。

2、做了简单的视频格式校验，如需添加，可以自己看着来。

3、最终视频名使用uuid避免重复。

验证一下

准备的视频信息。

执行结果

ffmpeg version n4.3.1-20-g8a2acdc6da Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3-win32 (GCC) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enabl
e-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --dis
able-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-lib
bluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenj
peg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --ena
ble-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'E:\360MoveData\Users\huyi\Desktop\3333333.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
creation_time : 2022-09-08T12:04:43.000000Z
Hw : 1
:
bitRate : 16000000
:
com.apple.quicktime.artwork: {"data":{"edittime":22,"infoStickerId":"","musicId":"","os":"windows","product":"lv","stickerId":"","videoEffectId":"","videoId":"245ba6f1-f2ab-4d70-b
c77-c70ea30c171a","videoParams":{"be":0,"ef":0,"ft":0,"ma":0,"me":0,"mu":0,"re":0,"sp":0,"st":0,"te":0,"t
maxrate : 16000000
:
te_is_reencode : 1
:
encoder : Lavf58.76.100
Duration: 00:00:26.91, start: 0.000000, bitrate: 11898 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 11741 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
creation_time : 2022-09-08T12:04:43.000000Z
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 156 kb/s (default)
Metadata:
creation_time : 2022-09-08T12:04:43.000000Z
handler_name : SoundHandler
Stream mapping:
Stream #0:1 -> #0:0 (aac (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'E:\360MoveData\Users\huyi\Desktop\7e1acd79-5117-4d4a-85eb-bff1bf01c80b.mp3':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
te_is_reencode : 1
:
Hw : 1
:
bitRate : 16000000
:
com.apple.quicktime.artwork: {"data":{"edittime":22,"infoStickerId":"","musicId":"","os":"windows","product":"lv","stickerId":"","videoEffectId":"","videoId":"245ba6f1-f2ab-4d70-b
c77-c70ea30c171a","videoParams":{"be":0,"ef":0,"ft":0,"ma":0,"me":0,"mu":0,"re":0,"sp":0,"st":0,"te":0,"t
maxrate : 16000000
:
TSSE : Lavf58.45.100
Stream #0:0(und): Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp (default)
Metadata:
creation_time : 2022-09-08T12:04:43.000000Z
handler_name : SoundHandler
encoder : Lavc58.91.100 libmp3lame
size= 422kB time=00:00:26.93 bitrate= 128.4kbits/s speed=84.1x
video:0kB audio:421kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.187326%
E:\360MoveData\Users\huyi\Desktop\7e1acd79-5117-4d4a-85eb-bff1bf01c80b.mp3