Using pipes with FFMpeg as an input

user_1765862 0
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I'm using FFMPEG library to manipulate video on user upload.

public async Task ManageVide(IFormFile file)
{   
   ... process file
   string command = $"-i inputFile.mp4 -vf -s 800x600 outFile.mp4";
   ...
}

is it possible to use memory stram as an input and output of the ffmpeg command? I read somewhere that for this can be used ffmpeg pipe. But I don't know how to structure the command

public async Task ManageVide(MemoryStream stream)
{   
    string command = $"-i pipe:{stream} -vf -s 800x600 test.mp4";
    ...
}
ffmpeg .net c#
2 Answers

I've been using the library CliWrap to work with FFMPEG. A simple example, of reading and writing from a memorystream:

await Cli.Wrap("Path/to/exe")
         .WithArguments(arguments)
         .WithStandardInputPipe(PipeSource.FromStream(source))
         .WithStandardOutputPipe(PipeTarget.ToStream(destinationStream))
         .ExecuteAsync(cancellationToken);

destinationStream.Position = 0;
user_34915890

You can use FFmpegArgs
Example

using FileStream input = new FileStream(".\\Images\\img0.jpg", FileMode.Open, FileAccess.Read, FileShare.Read);
using FileStream output = new FileStream("img0_out.jpg", FileMode.Create, FileAccess.Write, FileShare.Read);

FFmpegArg ffmpegArg = new FFmpegArg();
var videoMap = ffmpegArg.AddVideoInput(new VideoPipeInput(input, DemuxingFileFormat.mjpeg), 1, 0);
var imageMap = videoMap.ImageMaps.First().ScaleFilter().W("iw/2").H("ih/2").MapOut;
ffmpegArg.AddOutput(new ImagePipeOutput(output, MuxingFileFormat.mjpeg, imageMap));

var result = ffmpegArg.Render(c => c.WithFFmpegBinaryPath("path to ffmpeg")).Execute();

From arguments

var result = FFmpegRender
  .FromArguments(args,c => c.WithFFmpegBinaryPath("path to ffmpeg"))
  .WithStdInStream(pipein)
  .Execute();
user_50341390
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