Question / Help Turn off Mic Input but Still Record Audio from display playback...

Aronis

New Member
Hello all, OBS is a great AP and I have been able to use it to create the videos I need for educational purposes.

However, I made one of the videos too long for an upload to SmugMug (20 minute limit) and wanted to cut it in half. I have iMovie, GoPro Studio and a couple other editing tools but each takes the oringal input file (amazingly small file for 1080p at 60 FPS 200 MB or so for 39 minutes) and creates FRIGGEN HUGE, I mean 200 GB files with same output frame rate and resolution from files that are 200 megabyte so they are useless as they exceed the 3 GB limit for SmugMug. Even with the output resolution and frame rate turned down the files sizes are too large, unless I use the lowest settings and the video is not useable (and the file was still quite large).

I am currently simply re-playing the video I recorded, recording the screen with OBS and making two shorter videos from the too long one. I'll got it done but quietly leaving the room so my background noise does not get recorded and setting a timer to go and stop recording when I am at the end. I found out the hard way that the background noise was was being recorded since I was on the phone, and noticed the audio bar was rising as I spoke. LMAO. and had to turn of all iMessage messages because they kept coming up in the video. This is funny. :)

The problem is I cannot find a way to turn off the built in Microphone and still have OBS capture the audio from the video I am play and re-recording. I tried everything. If I mute the microphone in the operating system settings, it also mutes the playback video's output to OBS. This was odd I thought. For future use I'd like to find a work around.

Anyone have a similar issue and get it to work?

Mike
 

Narcogen

Active Member
Have you done the setup for desktop audio capture on MacOS?

How to capture desktop audio on Mac

It sounds like what you're getting is playing back the audio from the computer's speakers, and then recording it in OBS through the built-in microphone, which is absolutely not what you want, and would lead to the problem you describe.

You need 3rd party software to record the Mac's desktop audio directly; if you do that and then do not configure your built-in microphone as a source in OBS, you will not get any room noise.

You WILL get iMessage alerts, as these are sent to the default system audio device. You need to turn on Do Not Disturb mode in MacOS to stop those.
 

Narcogen

Active Member
Also, if all you're doing is trying to reduce the size of files you've already got without modifying them in any way, use HandBrake, it is a better tool for this purpose.

 

Aronis

New Member
Yes, I have Handbrake (used if for years) and was going to downsize the huge files made by iMovie, but my cheep cheat was easier. LOL. I was surprised that OBS did not have the code internal to record as I wanted and not buy recording from the speaker output. No big deal, I'll just be careful about video length in the future. Thank you for your input.

By the way, what Third Party software do you recommend?

Mike
 

Aronis

New Member
I just started looking at that....but.....dam....found easier solution....dam....

I opened OBS again and under the sources VLC was listed (since the program was open?) and if I choose that source, pick the video I want, and record) and I turn off all the check boxes for the mic tracks under advanced settings , bang, records my video and audio without the back ground bs. NICE>

That loop program looks interesting, I'll have to learn how to use it anyway, just because I guess.
 
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Aronis

New Member
loopback is interesting, but the program times out and stops working while you are trying to evaluate it before buying it for $100.00. They need to let you trial it for longer than an hour...d'ooh.

Mike
 
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