Correct aspect ratio while streaming from OSSC

Hello,

I just received the Avermedia Live Gamer Ultra capture card and tried it with retro consoles going through the OSSC (Open Source Scan Converter). My problem is that I can't find in OBS a setting that will give me the correct aspect ratio and not force the image to 16/9. In other words, a way to have the black bars I see on my TV back. Thanks !
 
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