public string WritePart() { FFMPEGCommand.AddInput(InputVideoPath); if (SamplingFrequency > 0) { FFMPEGCommand.AddFlag(new SimpleFlag("ar", SamplingFrequency.ToString())); } if (!string.IsNullOrEmpty(BitRate)) { FFMPEGCommand.AddFlag(new SimpleFlag("b:a", BitRate)); } if (NumAudioChannels >= 2) { FFMPEGCommand.AddFlag(new SimpleFlag("ac", NumAudioChannels.ToString())); } FFMPEGCommand.AddFlag(new SimpleFlag("y", null)); return(FFMPEGCommand.WritePart()); }