FFmpeg 是一套可以用来记录、转换数字音频、视频，并能将其转化为流的开源计算机程序。采用 LGPL 或 GPL 许可证。它提供了录制、转换以及流化音视频的完整解决方案。它包含了非常先进的音频/视频编解码库 libavcodec，为了保证高可移植性和编解码质量，libavcodec 里很多 code 都是从头开发的。
这篇文章主要介绍如何在 C# 中使用 FFmpeg。
在项目中使用包管理器控制台安装 nuget 包：
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PM> Install-Package xFFmpeg.NET
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1、从视频中抓取缩略图
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var
inputFile =
new
MediaFile (
@"C:\Path\To_Video.flv"
);
var
outputFile =
new
MediaFile (
@"C:\Path\To_Save_Image.jpg"
);
var
ffmpeg =
new
Engine(
"C:\\ffmpeg\\ffmpeg.exe"
);
// 保存位于视频第 15 秒的帧。
var
options =
new
ConversionOptions { Seek = TimeSpan.FromSeconds(15) };
await ffmpeg.GetThumbnailAsync(inputFile, outputFile, options);
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2、获取视频元数据
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var
inputFile =
new
MediaFile (
@"C:\Path\To_Video.flv"
);
var
ffmpeg =
new
Engine(
"C:\\ffmpeg\\ffmpeg.exe"
);
var
metadata = await ffmpeg.GetMetadataAsync(inputFile);
Console.WriteLine(metadata.Duration);
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3、基本转换
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var
inputFile =
new
MediaFile (
@"C:\Path\To_Video.flv"
);
var
outputFile =
new
MediaFile (
@"C:\Path\To_Save_New_Video.mp4"
);
var
ffmpeg =
new
Engine(
"C:\\ffmpeg\\ffmpeg.exe"
);
await ffmpeg.ConvertAsync(inputFile, outputFile);
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4、将 Flash 视频转换为 DVD
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var
inputFile =
new
MediaFile (
@"C:\Path\To_Video.flv"
);
var
outputFile =
new
MediaFile (
@"C:\Path\To_Save_New_DVD.vob"
);
var
conversionOptions =
new
ConversionOptions
{
Target = Target.DVD,
TargetStandard = TargetStandard.PAL
};
var
ffmpeg =
new
Engine(
"C:\\ffmpeg\\ffmpeg.exe"
);
await ffmpeg.ConvertAsync(inputFile, outputFile, conversionOptions);
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5、将 FLV 转换为 MP4
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var
inputFile =
new
MediaFile (
@"C:\Path\To_Video.flv"
);
var
outputFile =
new
MediaFile (
@"C:\Path\To_Save_New_Video.mp4"
);
var
conversionOptions =
new
ConversionOptions
{
MaxVideoDuration = TimeSpan.FromSeconds(30),
VideoAspectRatio = VideoAspectRatio.R16_9,
VideoSize = VideoSize.Hd1080,
AudioSampleRate = AudioSampleRate.Hz44100
};
var
ffmpeg =
new
Engine(
"C:\\ffmpeg\\ffmpeg.exe"
);
await ffmpeg.ConvertAsync(inputFile, outputFile, conversionOptions);
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6、截取视频
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var
inputFile =
new
MediaFile (
@"C:\Path\To_Video.flv"
);
var
outputFile =
new
MediaFile (
@"C:\Path\To_Save_ExtractedVideo.flv"
);
var
ffmpeg =
new
Engine(
"C:\\ffmpeg\\ffmpeg.exe"
);
var
options =
new
ConversionOptions();
options.CutMedia(TimeSpan.FromSeconds(30), TimeSpan.FromSeconds(25));
await ffmpeg.ConvertAsync(inputFile, outputFile, options);
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以上就是 FFmpeg.NET 类库才常用操作。