I fucked up. Need audio help.

Dave · Dec 12, 2016

Last Friday night I had a call to my potential brother, Rick. At the same time, my wife wanted me to record my nephew's school Christmas program, which was being live-streamed. So I set up OBS to record the second monitor, started the recording, and got on my phone call. An hour later I shut off the OBS and hung up the phone pretty much at the same time. Started testing the playback...and discovered I hadn't muted my webcam mic and recorded not only the Christmas program, but my stupid voice over the whole fucking thing.

Now, I know that they were PROBABLY recorded on separate channels, but I don't have a program that will strip individual channels from an MP4 video.

Does anyone know of one that would be able to do this separation? I have a file that would allow me to strip ALL sound, but not see if the sounds were recorded on different channels and able to remove just one.

drifter · Dec 12, 2016

Audacity, maybe? It's free to download so can't hurt to try.

Dave · Dec 12, 2016

Doesn't work with MP4 files. First thing I tried.

Tinwhistler · Dec 12, 2016

https://www.reddit.com/r/letsplay/comments/3l6xwe/how_to_extract_audio_from_obs_multi_mp4_files/

Files to download
32bit: http://www.videohelp.com/download/VirtualDub-1.10.4.zip?r=dfsPnxxsp
64bit: http://sourceforge.net/projects/virtualdubffmpeginputplugin/files/latest/download?source=files

Extract Virtual Dub where ever you please. IE: c:\vdub

Open up the Virtualdub FFMPEG Plugin zip file and place either the Plugins32 or Plugins64(depending on the version of virtualdub you got) in c:\vdub. You should now have a directory c:\vdub\plugins64 or c:\vdub\plugins32.

Open up virtualdub

Drag and drop a .mp4 created from OBS Multi

At the top of the window there is an drop down for "Audio". Click Audio -> Source Audio. This shows how many audio streams you have. Could be 1 to 4.

Select the desired audio stream for extraction

Click on File -> Save Wav.

Repeat from step 6 if you need to extract many tracks.

There you have it. Now you can take your audio and edit it in your favorite program.

[DOUBLEPOST=1481606502,1481606375][/DOUBLEPOST]Might also be able to use the FFMPEG plugin for Audacity.
http://www.audacityteam.org/download/plug-ins/

PatrThom · Dec 13, 2016

Yes, I can think of programs.
None of the ones I'm thinking of are free, though.

--Patrick

figmentPez · Dec 13, 2016

MediaCoder seems likely to be capable of what you want. Figuring out how to make it do that might be a pain.

EDIT: Handbrake might be able to do it as well.

Dave · Dec 13, 2016

I'll look at these tonight when I get home. If I don't fall asleep first. I had a late night.

PatrThom · Dec 13, 2016

The best thing I know of for what you want to do is a product called Isotope RX, but it ain't cheap.

--Patrick

Dave · Dec 13, 2016

Well, I've also heard that OBS doesn't separate audio streams, so I may be SOL from the get-go.

PatrThom · Dec 13, 2016

Dave said:
Well, I've also heard that OBS doesn't separate audio streams, so I may be SOL from the get-go.

One of the things about that Izotope software is that it lets you isolate and remove specific parts of audio. That's one of the reasons why it's so expensive.
As a general bit of advice, if you can't remove the voice, try instead to tweak things to remove everything else from the recording, because if you can do that, you can invert your voice and remix the inverted version back into the original audio in order to cancel it out.

--Patrick

GasBandit · Dec 13, 2016

I hope I'm wrong, but I get the feeling the audio tracks will only be separated left and right, not mic and loopback/speaker. If that's the case, getting the mic feed out of it will be like trying to get the eggs back out of a baked cake :/