Question

我正在使用用户指定的标记来实现与修剪音频文件相关的软件，例如，如果音频文件播放1分钟并且用户想要将该文件从20秒修剪为40秒并保存它有新文件。代码示例将不胜感激。

提前致谢。

Answer 1

感谢大家的回复，但我得到了Mark Heath NAudio的解决方案。这是样本希望它有所帮助：）

public static class WavFileUtils
{
    public static void TrimWavFile(string inPath, string outPath, TimeSpan cutFromStart, TimeSpan cutFromEnd)
    {
        using (WaveFileReader reader = new WaveFileReader(inPath))
        {
            using (WaveFileWriter writer = new WaveFileWriter(outPath, reader.WaveFormat))
            {
                int bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000;

                int startPos = (int)cutFromStart.TotalMilliseconds * bytesPerMillisecond;
                startPos = startPos - startPos % reader.WaveFormat.BlockAlign;

                int endBytes = (int)cutFromEnd.TotalMilliseconds * bytesPerMillisecond;
                endBytes = endBytes - endBytes % reader.WaveFormat.BlockAlign;
                int endPos = (int)reader.Length - endBytes; 

                TrimWavFile(reader, writer, startPos, endPos);
            }
        }
    }

    private static void TrimWavFile(WaveFileReader reader, WaveFileWriter writer, int startPos, int endPos)
    {
        reader.Position = startPos;
        byte[] buffer = new byte[1024];
        while (reader.Position < endPos)
        {
            int bytesRequired = (int)(endPos - reader.Position);
            if (bytesRequired > 0)
            {
                int bytesToRead = Math.Min(bytesRequired, buffer.Length);
                int bytesRead = reader.Read(buffer, 0, bytesToRead);
                if (bytesRead > 0)
                {
                    writer.WriteData(buffer, 0, bytesRead);
                }
            }
        }
    }
}

Answer 2

ffmpeg -ss 00:00:30.0 -t 00:00:10.0 -i input.mp3 -acodec copy output.mp3

这可以使用 Ffmpeg 来实现。因此，请为Windows下载 ffmpeg ，然后将 FFmpeg 作为Process下载。

PS：-ss Pun Offset -t Length，在示例中将音频文件从30秒修剪为40秒（10秒长度）

Answer 3

使用Sox提取文件的子部分

The trim effect copies the portion of the input starting at start and ending at start plus length to the output. Both parameters may be specified either as numbers of samples, consisting of an integer followed by the letter s, e.g. "8700s" or a time value. Time values are of the form ((hh:)mm:)ss(.fs). A bare integer is therefore a time value in seconds.

For example, suppose that you have a recording 1 hour long and wish to cut it into two halves. The following two commands will leave the first half in Half1.wav and the second half in Half2.wav.
sox Input.wav  Half1.wav trim 0 30:00
sox Input.wav  Half2.wav trim 30:00 30:00
The original file is unaffected, so once you have confirmed that the two output files contain what they should, you may delete the original if you wish to.

Sox是可扩展的，并且具有（可安装）支持多种格式，包括wav，flac，mp3等

Answer 4

尝试更改代码：

byte[] buffer = new byte[1024];

要

byte[] buffer = new byte[endPosition-startPosition];

修剪音频文件（.wav，.mp3）

4 个答案:

使用Sox提取文件的子部分