View source for Video-Editing-using-Blender/C2/Match-and-Align-Video-and-Audio/English




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|| '''Visual Cue'''
|| '''Narration'''

|-
|| '''Slide Number 1'''

'''Title Slide '''
|| Welcome to the spoken tutorial on '''Match and Align Video and Audio'''. 

|-
|| '''Slide Number 2'''

'''Learning Objectives'''
|| In this tutorial, we will learn to, 
* Add a new audio clip to the project
* Match and align video and audio clips recursively
* Use cut, trim, delete and move functions for alignment
 

|-
|| '''Slide Number 3'''

'''Learning Objectives'''
|| 
* Move clips between channels
* Hide or mute a clip and 
* Save any frame of the video as an image
* We will also learn about few short cut keys

|-
|| '''Slide Number 4'''

'''System and Software Requirement'''
|| To record this tutorial, I am using

* '''Ubuntu Linux''' v18.04 OS and 
* '''Blender''' 2.90.1

|-
|| '''Slide Number 5'''

'''Pre-requisites'''

'''https://www.spoken-tutorial.org'''
|| To follow this tutorial,
* Learner must be familiar with the '''Blender''' interface.
* For pre-requisite tutorials, please visit this site.

|-
|| '''Slide Number 6'''

'''Code Files'''
||
* Files used in this tutorial are provided in the '''Code files''' link.
* Please download and extract the files.
* Make a copy and then use them while practising. 

|-
|| Show opened '''blender''' interface.
|| I have already opened the '''Blender''' interface.

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|| Click on '''File, Open'''.
|| Click on '''File, Open''' to open the saved '''Blender''' project.

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|| From the '''Videos''' folder, choose the '''align.blend''' project file.
|| I have saved the input file in the '''Videos''' folder.

From the '''Videos''' folder, choose the '''align.blend''' project file.

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|| Click on '''Open'''.
|| Click on '''Open''' to open the project.

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|| Cursor next to the audio track.
|| The project has audio and video tracks.

|-
|| Cursor on the audio track.
|| I will delete the existing audio tracks and add a new audio clip to the project.

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|| Left click on any clip in the audio channel.
|| Let’s select all the audio clips in the audio '''channel'''.

For this, first left click on any audio clip in the audio channel.

|-
|| Adjust the zoom level as needed.
|| Use the mouse scroll wheel to adjust to desired zoom level.
|-
|| Adjust the bottom scroll bar left right to adjust field of view.
|| Move the scroll bar at the bottom to adjust the field of view.
|-
|| Go to '''Select, Channel''' and select '''Both Sides'''.
|| Go to '''Select, Channel''' and select '''Both Sides'''.

Now all the audio clips in the '''channel''' gets selected.

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|| Press the '''Delete''' key.
|| Press the '''Delete''' key to delete the audio clips.

|-
|| Click on the File Browser panel and show the options.
|| In the File explorer seen on the top left, go to the '''videos''' directory.

If you do not see the file browser, click on the folder icon to navigate.

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|| Click on '''View''' in the File Browser panel and show the options.
|| To adjust or change the style, use the options under the '''View''' menu as seen here.



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|| In the file browser seen on top left, go to the '''videos''' directory.
|| I have an audio file in the '''videos''' folder.

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|| Click on the filter funnel icon in the file browser.
|| If the audio file is not seen, click on the filter funnel icon in the file browser.

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|| Check the box for the '''Sound files'''.
|| Check the box for '''Sound files''' to show the audio files.

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|| Select '''audio.ogg''' file.
|| Select the '''audio.ogg''' file and add it to the '''Sequencer''' panel.

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|| Select the file, hold, drag and drop below the video channel.
|| For this, hold, drag and drop it below the '''video''' channel.

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|| Move the audio clip to match the starting to the video track.
|| I will adjust to match the starting position of the video track as seen here.

Let's match and align the video and audio in the clip.

|-
|| Cursor on the no signal region in the audio.
|| If the audio waveform is not visible, display it.

The regions without waveform signal, does not have audio in them.

Learner may use them as guides while editing. 

|-
|| Cursor to show between 20-50 seconds.
|| Pause the tutorial video and do the following.

Play the clip in '''blender''' from 20-50 seconds.

|-
|| Cursor on the interface.
|| Notice the repeated audio, misaligned audio and regions in video to be deleted.

|-
|| Zoom into the video strip at 24-30 second region.
|| Zoom into the strips around the 25-30 second region.

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|| 
|| I have repeated the '''open the blender interface''' line twice here.

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|| Play the region between 24-30 seconds
|| Let’s trim the repeated region in the video and audio.

|-
|| Place the playhead around 28 seconds. 
|| Place the '''playhead''' around 28 seconds. 

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|| Select both audio and video clips.
|| Select both audio and video clips.

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|| Press '''K'''.
|| Press the '''K''' key to cut the clips.

This is a soft cut.

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|| Select the left side video clip.

Hold left handle.

Trim to 25 second mark.
|| Select the video clip on the left side.

Hold the right handle and drag to trim the video to 25 second mark.

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|| Select the audio clip.

Trim to 25 seconds mark.
|| Select the audio clip and trim to 25 seconds mark as well.

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|| Move the playhead from 34-40 seconds.
|| Let’s move the playhead from 34-40 seconds.

Notice, the 35-38 second region in the video needs correction.

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|| Place the playhead at 42 seconds, select both clips and press '''K'''.
|| Place the playhead at 42 seconds. 

Select both clips and press '''K'''.
 
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|| Select the audio clip.
|| Let’s select the audio clip.

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|| Next, Place the playhead at 35 seconds mark and Press '''K'''.
|| Place the playhead at 35 second mark and Press '''K'''.

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|| 
|| Pause the tutorial video and play the video from 42 seconds.

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|| Cursor on the 35-42 second region in audio.
|| The audio from 35-42 seconds have to align with the video from 42 seconds.

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|| Cursor at 46-51 seconds region in audio.
|| Audio from 42-47 seconds has to be placed from 35 seconds.

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|| 
|| Let’s cut, swap and align the audio.

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|| Cut audio at 45 seconds and at 51 seconds.
|| Let's select the audio clip and make cuts at 45 seconds.

|-
|| Hover mouse over the channels.
|| To move the audio around comfortably, I will use more channels.

|-
|| Select the left audio '''Strip'''.
|| To move a clip, select it first.
Select the left audio clip.

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|| Move it to the channel above the video clip to the right.
|| Move it to the channel above the video clip to the right.

Click, hold, drag and drop it, in the desired location.

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|| 
|| Let’s position it approximately now.

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|| In the '''Strip''' tab, go to the '''Time''' section.
|| You may also change the '''channel''' using the '''Property panel''' or '''Sidebar'''.

In the '''Strip''' tab, go to the '''Time''' section.

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|| Click twice on the arrow on the left to show the options in the '''Time''' section.
|| If the options are not seen, click on the arrow on the left.

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|| Click twice on the arrow on the left of '''Time'''.

Cursor on '''Channel'''.
|| Notice the '''channel''' number.

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|| Cursor on the form, for '''Channel'''.
|| Enter the desired channel number in the form, to move the media strip.

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|| Move the right side clip to the left.
|| I will move the right side clip to the left.

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|| move the audio in the top channel back to the audio channel.
|| I will also move the audio in the top '''channel''' as seen here.

Now it is back in '''channel''' number 1.

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|| Go to the '''Strip''' tab.
|| We can also mute clips.

To mute a clip, go to the '''Strip''' tab.

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|| Uncheck the box next to file name.
|| Notice the check box next to the file name.

Uncheck the box to mute the clip.

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|| Cursor to show the clip color change.
|| Notice the color change to grey when the clip is muted.

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|| Check the box next to the file name to show the clip.
|| I will unmute the clip now.

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|| 
|| Let’s scroll further to see if the audio and video are aligned.

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|| '''Playhead''' at the end of the sentence.
|| At 38 seconds, the video cue changed.

I want the video frame to change only at the end of the sentence.

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|| Press '''Shift+K''' when the frame change.
|| Let’s hard cut the '''video''' at 42 seconds where the frame changes.

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|| Select the video clip on the right side.

Trim till 44 seconds, using the left handle.
|| Select the '''video''' clip on the right side.

Click on the left handle and trim till the end of the audio gap as seen here.

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|| Select the clip in the left of the gap.
|| Select the clip on the left of the gap.

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|| Hold the right handle and move over the gap.
|| Hold the right handle and move over the gap.

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|| Cursor on the '''sequencer''' panel.
|| Play the video completely and note down any changes you may desire.

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|| Cursor on the '''preview''' panel.
|| Complete any further change you want.

You can also save any frame number in the video to an image file.

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|| click on '''Render''', '''Render image'''.
|| To save a frame, click on the '''Render''', '''Render image''' option.

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|| Click on '''Image''', '''Save as''' to open the dialog box.
|| The '''Render''' window opens and the frame can be seen.

Click on '''Image''', '''Save as''' to open the '''Blender File View''' dialog box.

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|| Click open the options for '''File format''' and choose '''PNG'''.
|| Click open the options for '''File format''' on the right side and choose '''PNG'''.

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|| Cursor on '''RGB''' and '''compression''' parameter.
|| The output is set to '''RGBA''' to obtain a color image output.

I will retain the rest of the defaults.

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|| Choose Videos folder to save the file.
|| I will choose the '''Videos''' folder to save the file.
|- 
|| Type output filename as '''frame.png'''.

Click on '''Save As Image'''.
|| I will give the output filename as '''frame.png'''.

Click on '''Save As Image''' to save the frame.

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|| Close the '''Render''' window.
|| Close the '''Render''' window.

Save the project, '''render''' to an output file and quit '''Blender'''.

|-
|| '''Slide Number 7'''

'''Shortcut keys'''

Render Image F12

Render animation Ctrl+F12

Move strip to left Alt+Left arrow

Move strip to right Alt+Right arrow

Select all A
|| Knowledge of shortcut keys are very useful. 

Few shortcuts are shown here.

Please study them.

|-
|| '''Slide Number 8'''

'''Summary'''
|| Now let's summarize. In this tutorial, we,

* Added a new audio clip to the video
* Cut, deleted, trimmed and moved clips to align video and audio recursively
* Moved the clips between channels

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|| '''Slide Number 9'''

'''Summary'''
||  
* Hid or muted the clips
* Saved a frame in the video to an image file
* Learned about few shortcut keys

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|| '''Slide Number 10'''

'''Assignment'''
|| For assignment activity, please do the following.

Using a video of your choice video or with the '''align.webm''' video provided in the Codefiles link
* Cut, trim, match and align the video
* You may change to an audio of your choice
* '''Render''' and save the video file

|-
|| '''Slide Number 11'''

'''Spoken Tutorial Project'''
|| The video at the following link summarises the '''Spoken Tutorial''' Project.

Please download and watch it.

|-
|| '''Slide Number 12'''

'''Spoken Tutorial workshops'''
|| The '''Spoken Tutorial Project '''team:

* conducts workshops and 
* gives certificates.


Please write to us.

|-
|| '''Slide Number 13'''

'''Forum for specific questions:'''
|| Please post your timed queries in this forum.

|-
|| '''Slide Number 14'''

'''Acknowledgement'''
|| '''Spoken Tutorial''' Project is funded by '''MHRD, Government of India'''.

More information on this mission is available at this link.

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|| 
|| This is Rani from '''IIT Bombay'''. Thank you for joining.

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