c# Process Arguments and Missing Output -

i'm using ffmpeg process gather information on file:

private void gatherframes() {     process process = new process();     process.startinfo.filename = "ffmpeg";     process.startinfo.arguments = "-i \"" + filepath + "\"";     process.startinfo.redirectstandarderror = true;     process.startinfo.useshellexecute = false;      if (!process.start())     {         console.writeline("error starting");         return;     }     streamreader reader = process.standarderror;     string line;     while ((line = reader.readline()) != null)     {         outputrichtextbox.appendtext(line + "\n");     }     process.close(); } 

this seems works fine. want framerate, , thanks other posts, i've found ffprobe can used that:

public void getframerate() {     process process = new process();     process.startinfo.filename = "ffprobe";     process.startinfo.arguments = "-v 0 -of compact=p=0 -select_streams 0 -show_entries stream = r_frame_rate \"" + filepath + "\"";     console.writeline(process.startinfo.arguments);     process.startinfo.redirectstandarderror = true;     process.startinfo.redirectstandardoutput = true;     process.startinfo.useshellexecute = false;     process.startinfo.createnowindow = false;     console.writeline(process.startinfo);      if (!process.start())     {         console.writeline("error starting");         return;     }      streamreader reader = process.standarderror;     string line;     while ((line = reader.readline()) != null)     {         console.writeline(line);     }     process.close(); } 

this not seem work @ all. process starts, not return expect returned.

if run command manually, following in cmd.exe:

> e: > cd "file_path" > ffprobe -v 0 -of compact=p=0 -select_streams 0 -show_entries stream=r_frame_rate "file_name.mp4" r_frame_rate=60/1 

note: -show_entries stream = r_frame_rate not work, -show_entries stream=r_frame_rate without spaces.

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i'm not sure how go doing process.