How to display camera stream while encoding it to disk file?

[freesunshine]

i streams a camera to local file with code below:

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m = libvlc_media_new_location (inst, "dshow://"); CStringA opt_out_str; opt_out_str.Format(":sout=#transcode{width=640,height=480,vcodec=h264,vb=800,scale=1,fps=25.1f,acodec=aac,ab=128,channels=2,samplerate=44100} :duplicate{dst=std{access=file,mux=ts,dst=c:\\out.ts}}", libvlc_media_add_option(m,opt_out_str.GetString());

it works all right. but the camera video will not display on the window anymore. i tried changing the duplicate part like this:

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:duplicate{dst=display,dst=std{access=file,mux=ts,dst=c:\\out.ts}}

but it did not work because this would display the encoded image but not the camera raw image.
how can i display the camera raw image while encoding it? how to write the option string?

[Rémi Denis-Courmont]

In that case, duplication BEFORE transcode is probably a better idea in terms of performance and latency.

[freesunshine]

thank you so much!