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I'm trying to create a desktop live-streaming app in C#. The program must run under Windows and stream image from user's desktop to rtmp. There must also be options of framerate, video size, quality and codec (h263 and h264). I think FFmpeg is the best choise for this (if it is not so, please write a comment). I've managed to do everything I mentioned above with ffmpeg.exe using console. So I wish to know, can I include FFmpeg library into C# project (as a .lib or .dll) to use it instead of .exe, saving suitable functionality for my task? I'll be very grateful for any examples.

P.S. Here are some examples of commands I use:

ffmpeg -f dshow -i video=UScreenCapture -vcodec h264 -pix_fmt yuv420p -s 320x240 -f flv rtmp://[my adr]/desc

ffmpeg -f dshow -i video=UScreenCapture -vcodec h264 -r 15 -t 0:1:00 -q 12 -pix_fmt yuv420p -s 320x240 -f flv rtmp://[my adr]/desc
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2 Answers 2

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12

This is my sample, hope this help

You can use .exe file like this: 

ffmpeg.StartInfo.UseShellExecute = false;
ffmpeg.StartInfo.RedirectStandardOutput = true;
ffmpeg.StartInfo.FileName = Server.MapPath("~/Video_Clips/ffmpeg.exe");

ffmpeg.StartInfo.Arguments = String.Format(@"-i ""{0}"" -threads 8 -f webm -aspect 16:9 -vcodec libvpx -deinterlace -g 120 -level 216 -profile 0 -qmax 42 -qmin 10 -rc_buf_aggressivity 0.95 -vb 2M -acodec libvorbis -aq 90 -ac 2 ""{1}""",
                                           Server.MapPath("~/Video_Clips/" + sNameWithoutExtension + ".wmv"),
                                           Server.MapPath("~/Video_Clips/" + sNameWithoutExtension + ".webm"));
ffmpeg.Start();

ffmpeg.WaitForExit();
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3 Comments

At some point, you should call Close or Dispose on ffmpeg (which would appear to be of the type Process) to free up the process handle. From MSDN: Handles are an extremely valuable resource, so leaking handles is more virulent than leaking memory. No, the samples don't do this. I've submitted feedback on them.
Thank you for your answer, it's really helpfull. The problem is, that I can't open your project nor with VS-2010, neither with VS-2012. In fact I don't need it for understaniding your answer (your comment is enought), but it's interesting for me to look at it. How can I open your project?
It looks strange, let me try to open it again and I will tell later.
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I know it's a bit old thread but if I get here other people see this too. You shoudn't use it process info to start ffmpeg. It is a lot to do with it. Just use any wrapper. I did this mistake and waste almost year of my life... In Xabe.FFmpeg you could do this by running just 

await Conversion.New().Start(@"-i ""{0}"" -threads 8 -f webm -aspect 16:9 -vcodec libvpx -deinterlace -g 120 -level 216 -profile 0 -qmax 42 -qmin 10 -rc_buf_aggressivity 0.95 -vb 2M -acodec libvorbis -aq 90 -ac 2 ""{1}");

but this is just a basic usage because it provide fluent API to use FFmpeg.

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