FFmpeg 是一套可以用來記錄、轉換數字音頻、視頻，並能將其轉化為流的開源計算機程序。采用 LGPL 或 GPL 許可證。它提供了錄制、轉換以及流化音視頻的完整解決方案。它包含了非常先進的音頻/視頻編解碼庫 libavcodec，為了保證高可移植性和編解碼質量，libavcodec 里很多 code 都是從頭開發的。
這篇文章主要介紹如何在 C# 中使用 FFmpeg。
在項目中使用包管理器控制台安裝 nuget 包：
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PM> Install-Package xFFmpeg.NET
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1、從視頻中抓取縮略圖
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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"
);
// 保存位於視頻第 15 秒的幀。
var
options =
new
ConversionOptions { Seek = TimeSpan.FromSeconds(15) };
await ffmpeg.GetThumbnailAsync(inputFile, outputFile, options);
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2、獲取視頻元數據
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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、基本轉換
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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、將 Flash 視頻轉換為 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、將 FLV 轉換為 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、截取視頻
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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 類庫才常用操作。