Get Unable to cast object of type 'FFmpeg.NET.MediaFile' to type 'FFmpeg.NET.InputFile' error when trying to cut video file. about ffmpeg.net HOT 2 CLOSED

Your code
MediaFile video_in = new(input_file1);
MediaFile video_out = new(output_file1);
needs to look as such
MediaFile video_in = new MediaFile(input_file1);
MediaFile video_out = new MediaFile(output_file1);

That's why you received the type mismatch error.

//ffmpegPath is your path to ffmpeg.exe. eg "c:\ffmpeg\ffmpeg.exe"
public async Task MakeVideoSegment(string input, string output, string ffmpegPath, int TrimStart, int TrimEnd)
{
var inputFile = new MediaFile(input);
var outputFile = new MediaFile(output);
var ffmpeg = new FFmpeg.NET.Engine(ffmpegPath);
var options = new ConversionOptions();
int SecondsToTrim = TrimEnd - TrimStart;
options.CutMedia(TimeSpan.FromSeconds(TrimStart), TimeSpan.FromSeconds(SecondsToTrim));
await ffmpeg.ConvertAsync(inputFile, outputFile, options);
TrimmedFileNameFullPath = outputFile.FileInfo.FullName.ToString();
return TrimmedFileNameFullPath;

    }

from ffmpeg.net.

Use InputFile and OutputFile instead of MediaFile. MediaFile will now actually become an abstract class and does not implement IInputArguments which is used by ConvertAsync.

var inputFile = new InputFile(@"C:\Path\To_Video.flv");
var outputFile = new OutputFile(@"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, default);

from ffmpeg.net.