c# - expression encoder - does not capture system audio -

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i'm trying capture webcam , system audio using expression encoder, webcam works fine system audio silent.

i followed tutorial here: codeproject expression encoder tutorial isn't working me properly.

when list audio devices, "speakers...", "microphone..." , "headphones..." listed (as in playback devices in system tray) if try , record either speakers or headphones nothing (i mic audio fine if select one).

here code i'm using:

job = new livejob();  livedevicesource lds = job.adddevicesource(ledv[0], leda[1]);  filearchivepublishformat fileout = new filearchivepublishformat(); fileout.outputfilename = string.format("c:\\users\\user1\\desktop\\testvideo-{0:yyyymmdd_hhmmss}.wmv", datetime.now);  job.publishformats.add(fileout);  lds.previewwindow = new previewwindow(new system.runtime.interopservices.handleref(panel1, panel1.handle));  job.startencoding();  job.activatesource(lds);

does have idea why doesn't record system audio? there other settings need mess before should work?

thanks time.

edit:

i decided print out job.currentaudiovolume when encoding see if ever changed sits @ 0. if change audio device microphone, value goes when there sound (as expected). looks sdk unable record system audio (either speakers or headphones).

okay sorted out bit of colleague.

basically headphones/speakers etc. output devices , need install loopback driver input device.

there's free 1 on sourceforge/github works great. select audio device.

there 1 small problem, i've got "record"/"stop" button calls job.stopencoding(); loopback audio driver chosen stopencoding() hangs window, guess because loopback driver doesn't stopped properly, if call job.removedevicesource(devicesource); after call stopencoding() , re-add before next startencoding() works fine.


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