Question

问候，

我正在尝试找到一个免费的.NET库或命令行可执行文件，它允许我将M4A文件转换为MP3或WMA文件。请帮忙:)。

Answer 1

发现它！

http://pieter.wigleven.com/it/archives/3

可能还有其他解决方案，但这是我正在寻找的黄金。

P.S。我写了a .NET DLL来处理这个幕后故事。这是非常可怕的代码，但它完成了工作。

Answer 2

如果您知道正确的工具，这很简单：

ffmpeg -i infile.m4a tmp.wav
lame tmp.wav outfile.mp3

这是一个批量版本（对不起Linux / Mac）：

#!/bin/bash

n=0
maxjobs=3

for i in *.m4a ; do
    ffmpeg -i "$i" "$TMP/${i%m4a}wav"
    (lame "$TMP/${i%m4a}wav" "${i%m4a}mp3" ; rm "$TMP/${i%m4a}wav") &

    # limit jobs
    if (( $(($((++n)) % $maxjobs)) == 0 )) ; then
        wait
    fi

done

Answer 3

有趣。
您提供的链接指向命令行实用程序如果您真的想以编程方式执行此操作，您可能会对我在Rarewares找到的DLL版本感兴趣。不确定API说明是否附带......： - ）

Answer 4

来自How to convert media file to WMA file

string fileName = @"e:\Down\test.wmv";
DsConvert.ToWma(fileName, fileName + ".wma", DsConvert.WmaProfile.Stereo128);

Answer 5

对于UWP

public class ConvertToMp3Manager
{
    public PrepareTranscodeResult PrepareTranscode = null;
    public MediaTranscoder TransCoder = null;
    public StorageFile SourceAudio { get; set; }
    public StorageFile DestinationAudio { get; set; }
    public AudioFormat AudioFormat { get; set; }
    public AudioEncodingQuality AudioQuality { get; set; }
    private MediaEncodingProfile profile = null;
    public  ConvertToMp3Manager(StorageFile sourceAudio, StorageFile destinationAudio, AudioFormat AudioType = AudioFormat.MP3, AudioEncodingQuality audioEncodingQuality = AudioEncodingQuality.High)
    {
        if (sourceAudio == null || destinationAudio == null)
            throw new ArgumentNullException("sourceAudio and destinationAudio cannot be null");
        switch (AudioType)
        {
            case AudioFormat.AAC:
            case AudioFormat.M4A:
                profile = MediaEncodingProfile.CreateM4a(audioEncodingQuality);
                break;
            case AudioFormat.MP3:
                profile = MediaEncodingProfile.CreateMp3(audioEncodingQuality);
                break;
            case AudioFormat.WMA:
                profile = MediaEncodingProfile.CreateWma(audioEncodingQuality);
                break;
        }
        this.SourceAudio = sourceAudio;
        this.DestinationAudio = destinationAudio;
        this.AudioFormat = AudioType;
        this.AudioQuality = audioEncodingQuality;
        this.TransCoder = new MediaTranscoder();
    }
    /// <summary>
    /// Return true if audio can be transcoded
    /// </summary>
    /// <returns></returns>
    public async Task<bool> ConvertAudioAsync()
    {
        PrepareTranscode = await this.TransCoder.PrepareFileTranscodeAsync(this.SourceAudio, this.DestinationAudio, profile);
        if (PrepareTranscode.CanTranscode)
        {
            var transcodeOp = PrepareTranscode.TranscodeAsync();
            return true;
        }
        else
            return false;
    }
    public static async Task<bool> ConvertAudioAsync(StorageFile sourceAudio, StorageFile destinationAudio, AudioFormat AudioType = AudioFormat.MP3, AudioEncodingQuality audioEncodingQuality = AudioEncodingQuality.High)
    {
        ConvertToMp3Manager convertToMp3Manager = new ConvertToMp3Manager(sourceAudio, destinationAudio, AudioType, audioEncodingQuality);
        var success = await convertToMp3Manager.ConvertAudioAsync();
        return success;
    }
}
public enum AudioFormat
{
    MP3,
    AAC,
    M4A,
    WMA
}

如何以编程方式将M4A文件转换为MP3或WMA文件？

5 个答案: