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Using ffmpeg, a free command-line tool, ffmpeg -i -c:v copy -af "pan=1c|c0=c0" This copies the video over, and the audio is mono with the first channel of the input mapped for export. Some players may not be setup to default to a stereo matrix. In which case, you can generate a faux stereo stream. ffmpeg -i -c:v copy -af ...


I have the G20 and VidPro Xm-55... u r going to go into custom audio settings and then go to audio mix and just mix about two clicks up on internal microphone and let the external to the rest- that way you get clean sound with stereo separation. We do live music studio recording and when my overall level is set around 67/70 it seems to be perfect.

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