View source for OBS-Studio/C2/Audio-and-Output-settings-in-OBS/English

Title: Audio and Output settings

Author: Nikita Misal


{| border="2"
|- 
|| '''Visual Cue'''
|| '''Narration'''
|- 
|| '''Slide''': Title
|| Welcome to the '''spoken tutorial''' on '''Audio and Output settings.'''
|- 
|| '''Slide''': Learning Objectives
|| In this tutorial, we will learn to '''configure''':
* '''Video settings'''
* '''Output settings''' and
* '''Audio settings.'''

|- 
|| '''Slide: '''OS and Versions


|| '''OBS Studio '''can '''run''' on any of the following operating systems:

* '''Microsoft Windows 8''' or higher versions
* '''GNU/Linux OS 18.04 '''or higher''' '''and
* '''Mac OS X 10.13 '''or higher versions.

|- 
|| Slide: 
|| This tutorial is recorded using
* '''Windows 10'''
* '''OBS version 27.0.1''' 
* and '''Firefox web browser'''.

You can use any '''web browser''' of your choice.
|- 
|| Slide: High Quality videos

|| In order to produce '''high-quality videos''', it is important to understand:

* How '''video resolution''' matches to '''canvas aspect ratio '''and
* How to avoid '''resampling audio tracks'''.

|- 
|| Slide: What is Video resolution 
|| 
* '''Video resolution''' is the image size visible to the viewer.
* Its width and height in '''pixels''' is called ''''Video Resolution''''.
* Usually, a video plays in '''full resolution''' on the '''screen'''.
* It is wise to make '''videos compatible''' with common '''video players'''. For eg:'''VLC Player.'''

|- 
|| Slide: What is Audio Sample rate 
|| What is '''Audio Sample rate'''? 
* Each '''sound stream''' consists of a number of '''digit samples flow. '''
* That number must exceed at least twice the''' highest frequency''' of the '''sound stream'''. 
* Human ears can recognize '''frequencies''' upto '''20000 Hz'''.
* Hence, the most common '''audio sample rates''' are '''44100 Hz''' and '''48000 Hz'''.

|- 
|| Only Narration
|| Now let us learn how to '''set video resolution''' for our '''recording.'''

I have already opened the '''OBS studio interface '''in my system.

Please do so on your system.
|- 
|| Click on the '''Settings''' button.

Point towards the '''Settings''' dialog box.
|| At the bottom right, click on the '''Settings''' button.

The '''Settings''' dialog box pops up.
|- 
|| Click on the '''Video''' tab.

Hover over each option as per the narration.
|| On the left side panel, click on the '''Video''' tab.

Under the '''Video''' tab on the right side, 4 options are displayed.
|- 
|| Slide: Video Options
|| '''Base (Canvas) Resolution '''defines the '''Canvas preview aspect ratio''' and '''Canvas size'''. 

'''Output (Scaled) Resolution '''defines the main '''Output resolution.'''

'''Downscale Filter''' specifies the '''filters''' used in '''scale operations'''. 

This '''filter''' changes how '''OBS''' shrinks the '''video'''.

It decides what details are to be kept and which to discard in the '''video'''.

'''Common FPS Values '''specifies sets of''' frame rates (fps).''' 

It is the '''rate''' at which OBS Studio will '''render''' its output.
|- 
|| Click on the drop down next to '''Base (Canvas) Resolution.'''

Select '''1920 x 1080'''
|| Now on the '''OBS interface''', click on the drop-down next to '''Base (Canvas) Resolution.'''

'''Resolution''' options are displayed. 

I will select '''1920 x 1080.'''
|- 
|| 

Type, 1920 x 1080 
|| Next, we will change the value of our '''Output (Scaled) Resolution.'''

We want our '''output''' to be the same size as the''' Canvas resolution.'''

So, I will type '''1920 x 1080''' here.
|- 
|| Click on the drop down next to '''Downscale Filter '''>> select '''Bilinear.'''

Select '''30fps'''
|| Click on the drop-down next to '''Downscale Filter '''and select '''Bilinear.'''

Under '''Common FPS Values, '''I will select '''30fps.'''
|- 
|| Click on the '''Apply''' button >> click on the '''OK''' button.
|| Click on the '''Apply''' button and then on the '''OK''' button at the bottom of the window.
|- 
|| '''Controls >> Start Recording''' button.

|| Under the '''Controls''' panel on the right, click on the '''Start Recording''' button. 

Minimize the '''screen''' and record any other window of your choice.
|- 
|| Open Firefox web browser >> '''Spoken Tutorial website'''. 
|| I am '''recording''' my '''Firefox web browser''' screen.

I will briefly record the '''Spoken Tutorial website'''. 
|- 
|| 

Click on the '''Stop Recording '''button.
|| After '''recording''' is done, switch back to the '''OBS''' window.

And click on the '''Stop Recording '''button.
|- 
|| Click on '''File'''

Click on '''Show Recordings'''.
|| To locate the '''recording''', click on the '''File''' menu on the top left of the '''OBS''' interface.

Click on '''Show Recordings.'''
|- 
|| Right-click on it >> '''Open with''' option.

Select '''VLC player'''

|| To view the '''recording''', first right-click on it and from the '''context menu,''' select '''Open with''' option.

From the sub-menu, select any '''Player''' available on your system. 

I will select''' VLC player.'''
|- 
|| Only narration
|| Notice that the '''video''' is not very clear even in '''1920 x 1080 resolution.'''

The '''Downscale Filter''' has degraded the '''output quality'''.

This is done in order to '''render''' the '''video''' quickly.
|- 
|| Switch to '''OBS''' >> click on '''Settings'''


Point towards settings dialog box.
|| Go back to the '''OBS''' window.

At the bottom right under '''Controls, '''click on the '''Settings''' button.

The '''Settings''' dialog box pops up.
|- 
|| Click on the Video tab.

Under''' Downscale Filter '''select''' Lanczos.'''
|| On the left panel, click on the '''Video''' tab.

Under''' Downscale Filter, '''select''' Lanczos.'''
|- 
|| Click on the '''Apply''' button >> click on the '''OK''' button.
|| Click on the '''Apply''' button and then on the '''OK''' button at the bottom of the dialog box.
|- 
|| Controls>>Start Recording button.
|| Under the '''Controls''' panel on the right side, click on the '''Start Recording''' button.
|- 
|| 

Open Firefox web browser >> '''Spoken Tutorial website'''. 
|| Now, go to the same screen as we did earlier.

Here, I have already opened the '''Spoken tutorial website.'''
|- 
|| 

Click on the '''Stop Recording '''button.
|| After '''recording''' is done, switch back to the '''OBS''' window.

And click on the '''Stop Recording '''button.
|- 
|| Click on '''File >> '''Click on '''Show Recordings'''

Right-click on it >> '''Open with''' option >> Select '''VLC'''.
|| At the top left, click on the '''File menu''' and select '''Show Recordings.'''

'''Play''' the '''video''' as demonstrated earlier.
|- 
|| Point towards the video.
|| Notice, the '''quality''' of the '''video''' has changed and the '''file size''' has increased.
|- 
|| Point towards '''Downscale filter''' option.
|| Depending on the '''video quality''' and '''file size''' we can adjust the '''Downscale filter''' option.

'''Downscale filter '''can be adjusted according to:
* '''Video quality'''
* '''File size'''

|- 
|  | Only narration
|| Next, let’s learn about '''Audio properties''' in '''OBS.'''
|- 
|| 

Switch to '''OBS''' >> click on '''Settings.'''

Point towards settings dialog box.
|| Go back to the '''OBS''' window.

At the bottom right under '''Controls, '''click on the '''Settings''' button.

The '''Settings''' dialog box pops up.
|- 
|| Click on the '''Audio''' tab.

Select''' 44.1khz '''and''' Stereo'''

Point towards '''Global Audio Devices''' by default '''Desktop Audio'''.

|| On the left panel, click on the '''Audio''' tab.

Under the '''General''' section, let’s use '''Sample rate''' of '''44.1 kHz''' and '''Channels''' as '''Stereo.''' 

In my case under '''Global Audio Devices''' by default '''Desktop Audio''' is set to '''Default.'''

It may vary depending on your system settings.
|- 
|| Point towards '''Mic/Auxiliary Audio'''
|| '''Mic/Auxiliary Audio''' is set to '''Default '''and everything else is '''Disabled.'''
|- 
|| Click on the '''Apply''' button>> click on the '''OK''' button.
|| Click on the '''OK''' button.
|- 
|| Point towards the '''Restart OBS''' dialog box.

Click on the '''Yes''' button.
|| The '''Restart OBS''' dialog box pops up.

Here, click on the '''Yes''' button.
|- 
|| Slide '''OBS does not restart'''
|| If '''OBS''' doesn’t '''restart''' correctly, the “'''OBS is already running”''' dialog box appears.

Here, click on the '''Launch anyway''' button.
|- 
|| 
|| We see that the '''OBS''' window restarts with our new '''configuration.'''
|- 
|  | Only narration
|| Next, let's learn to add '''filters''' to our '''Audio.'''
|- 
|| Select '''Scene 002'''.

'''Sources''' panel select the '''Arvind’s external mic.'''
|| Select '''Scene 002'''.

In the '''Sources''' panel, select '''Arvind’s external mic.'''
|- 
|| '''Audio mixer panel, '''the''' Device '''option is set to''' Default.'''

Select''' Microphone (Realtek High Definition Audio).'''
|| Above the''' Audio mixer panel, '''the''' Device '''option is set to''' Default.'''

Click on the drop-down next to '''Default.'''

Then select '''Microphone (Realtek High Definition Audio).'''
|- 
|| 

Point towards thenew '''Audio''' track.
|| It may vary depending on your '''system settings''' and the '''headset '''you are using.

Note: If no '''Audio''' is detected, check your '''system settings''' and add an '''audio input'''.
|- 
|| Click on'''Start recording '''button.
|| Now click on the '''Start recording''' button at the bottom right.

I will narrate the following sentences “'''Welcome to the spoken tutorial on Audio and Output settings.'''


'''In this tutorial, we will learn:'''
* '''Video settings'''
* '''Output Settings'''
* '''Audio settings.'''

|- 
|| Click on the '''Stop recording '''button.
|| Click on the '''Stop recording '''button.
|- 
|| Click on'''File >> Show recordings.'''

|| Then click on the '''File''' menu at the top left of the '''OBS''' interface.

Click on '''Show Recordings.'''
|- 
|| Right click on it >> Open with option >> Select '''VLC'''
|| '''Play''' the '''video''' as demonstrated earlier.
|- 
|| Point towards the audio
|| Notice that the '''audio''' has '''disturbance''' in it.

We will remove this by adding some '''filters''' to our '''audio'''.
|- 
|| Click the '''gear''' icon next to the '''volume''' button.

>>Select '''Filters'''
|| In the '''Audio Mixer''' window, click the '''gear''' icon next to the '''volume''' button. 

From the '''context menu,''' select '''Filters.'''
|- 
|| Point towards '''Audio Input Capture'''
|| '''Filters for ‘Arvind’s external mic’''' window appears.
|- 
|| Left side >> click the '''+''' button >> Select the '''Noise suppression''' filter.
|| To add a '''filter''', click the '''+ plus''' button on the left side of the window.

Let us select the '''Noise suppression filter.''' 
|- 
|| Point towards '''Filter name'''

click on the '''OK''' button.
|| A dialog box saying “'''Filter Name”''' appears.

I will keep the name as it is and click on the '''OK''' button.
|- 
|| Right side >> click on '''Method '''drop-down >> select '''RNNoise'''
|| On the right side, click on the drop-down next to the '''Method''' option.

Here, we will select '''RNNoise.'''
|- 
|| Click on the '''+''' button >> Select the '''Compressor''' filter 
|| Then again click on the '''+ plus '''button on the left side and select the '''Compressor filter'''. 
|- 
|| Point towards '''Filter Name'''

Click on the '''OK''' button.
|| A dialog box saying '''“Filter Name”''' appears.


I will keep the name as it is and click on the '''OK''' button.
|- 
|| Hover over each option.
|| Here we see different options with adjusting '''levels.'''

We will keep them as they are.
|- 
|| Click on the '''Close''' button.
|| And click on the '''Close''' button at the bottom of the window.
|- 
|| Click on '''Start recording '''button >> Narrate.
|| Now click on the '''Start recording '''button.

I will again narrate the same sentences as earlier.
|- 
|| '''Stop recording >> File '''>>'''Show recordings'''

Right-click on it >> '''Open with''' option >> Select '''VLC player'''
|| Then click on the '''Stop recording '''button.

And '''play''' the '''recording''' as demonstrated earlier.
|- 
|  | 
|| Notice the difference in the '''audio'''.
|- 
|| Only narration
|| This brings us to the end of this tutorial.

Let us summarize.
|- 
|| '''Slide''': Summary
|| In this tutorial, we learnt how to '''configure''':

* '''Video settings'''
* '''Output settings ''' and
* '''Audio settings.'''

|- 
|| '''Slide''': Assignment

|| As an assignment

* Try different '''Base (Canvas) Resolution '''and''' Output (Scaled) Resolution settings.'''
* Use the '''Downscale filter''' and note the difference in the '''quality''' of the output.
* Add other '''Noise filters''' to your '''audio''' and make a note of the difference.

|- 
|| Slide: About Spoken Tutorial Project
|| 
* The video at the following link summarises the Spoken Tutorial project.
* Please download and watch it.

|- 
|| '''Slide''': Spoken tutorial workshops
||
* We conduct workshops using spoken tutorials and give certificates.
* For more details, please contact us.

|- 
|| '''Slide''': Answers for THIS Spoken Tutorial
|| Pls post your timed queries in this forum.
|- 
|| '''Slide''': Acknowledgement
|| Spoken Tutorial project is funded by the Ministry of Education (MoE), Govt. of India.
|-
|  | 
|  | This is Arvind Pillai along with Nikita Misal from IIT Bombay signing off. 

Thank you for joining.
|-
|}