SinisterMaya

You can do it using a RawVideoPipeSource like in the example file https://github.com/rosenbjerg/FFMpegCore/blob/main/FFMpegCore.Examples/Program.cs

IMHO the issue here is from a design choice for the indentation or It could be an oversight. from the MudTableGroupRow.razor :  Level coming from the TableGroupDefinition Class ...

Your args translate to ``-i "D:\VideoFile\a.mp4" -c:v copy -c:a aac -movflags faststart "D:\VideoFile\b.mp4" -y`` Have you tried to remove the WithFastStart argument ? also, you can use directly the copy...