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 |
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); |
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); |
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); |
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); |
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); |
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); |
以上就是 FFmpeg.NET 类库才常用操作。