I am compressing the video file in order to upload it to the server.。
Actual images of the start and end points
- Memorandum on 30fps problems that occur in AI video production
- Overall workflow
- Step 1：Creating a new project and arranging materials
- Step 2：Change timeline settings to 60fps
- Step 3：Stretch the video to 10 seconds and apply optical flow
- Memorandum about optical flow
- Step 4：Run the rendering
- State after rendering
- Memo at the time of export
- summary
Memorandum on 30fps problems that occur in AI video production
in recent years、Video generation AI is evolving very rapidly.、It is now possible to produce high-quality videos even without professional video production skills.。
Among them, the latest "Kling AI 3.0"、Kling is a top-of-the-line class that boasts the highest level of physics calculations and native 4K/60fps output. 3.0 With the advent of "Omni"、Video, which was once the mainstay 2.5 Turbo” is、Nowadays it is low cost in a good wayLow price version (lower class)I am now in the position of。
of course、It would be best to use the top-of-the-line "Omni" without sparing the funds.、For purposes such as posting on SNS、"Video" allows you to create 1080p 5 seconds videos while significantly reducing consumption credits. 2.5 Turbo” has the best cost performance。AI video generation does not always produce the desired image in one shot.、“Keep costs down、It also means that you can recreate it as many times as you like (turn the gacha) until you are satisfied with it.、The benefits of choosing this low-priced version are huge.I can say that。
and、In this low-priced model with excellent cost performance、The following generation method is particularly practical.。
- Specify the "first image (starting point)" of the video
- Specify the "last image (end point)" of the video
- Let AI automatically fill in the interval (between two cuts)
The generation method。
This method is、
- Easy to control composition
- Easy to fix subject position
- Easy to guide camera work
- Easy to create cinematic effects
There is a characteristic that、Easy to create the images you want。
but、This generation method has clear weaknesses.。
Many video generation models that emphasize cost performance、Standard frame rate is 30fps。
30FPS is a video consisting of 30 images per second.。
If you stretch the generated 5 seconds video to 10 seconds with Premiere Pro and turn it into slow motion,、Insufficient number of frames as required。
the result、
- rattle
- stutter
- movement flies
- Cinematic smoothness is lost
Problems such as。
Especially in AI videos、
- swaying hair
- human movement
- movement of hands and fingers
- interior depth
- wrap around background
- camera movement
A sense of discomfort is noticeable due to。
Therefore, we employ、
AIOn the side, images can be generated at low cost.、The missing frame isPremiere Procomplement on the side
the idea that。
By using Premiere Pro's optical flow、30Convert fps material to smooth 60fps slow motion video。
Overall workflow
The actual work flow is as follows。
1. Launch a new project
Create an editing environment with Premiere Pro。
2. 5Place AI video material in seconds on the timeline
Load the generated video。
3. Change timeline to 60fps
Change the editing base to 60fps。
4. Change video speed to 50% and apply optical flow
Force Premiere Pro to generate missing frames。
5. Run the rendering
Calculate complementary frames。
Step 1：Creating a new project and arranging materials
First, launch Premiere Pro。
Create a project as a base for editing。
Work procedure
- Launch Premiere Pro
- Click the blue "New Project" displayed on the start screen
- Enter the project name in the top left
- Click "Create" at the bottom right
*There is no problem even if you do not select the material at this stage.。Create an empty state。
- When the editing screen opens、Drag and drop the 1080p 5 second video material generated by AI to the project panel.
- Drag and drop the loaded video to the timeline panel
The video material will now be placed on the timeline.。
Step 2：Change timeline settings to 60fps
Immediately after placing the video、Timeline settings are matched to the material。
Therefore、
- 30fps
- 24fps
etc. in many cases.。
However, the purpose of this time is to create a 60fps slow motion video.、Change the sequence itself, which is the basis of editing, to 60fps.。
Work procedure
- Click "Sequence" at the top of the screen
- Click "Sequence settings"
- Open settings window
- Check "Timebase"
- Open dropdown menu
- Select one of the following
- 59.94fps
- 60fps
- press OK
on the way
"Preview file will be deleted"
There is no problem even if the warning is displayed.。
Continue with OK。
The editing environment itself will now be based on 60fps.。
Step 3：Stretch the video to 10 seconds and apply optical flow
This is the most important step。
Instead of simply stretching the video、Let AI supplement missing frames。
Work procedure
- Click to select a video clip on the timeline
When selected, the clip is displayed in a whitish color.。
- Click "Clip" on the menu bar
- Select "Speed/Duration"
- Change the following on the settings screen
speed
50％
This will extend the 5 second video to 10 seconds.。
Interpolation (time interpolation)
optical flow
select。
- press OK
Premiere Pro is now ready to generate the missing frames.。
Memorandum about optical flow
What is optical flow?、
Analyzing the movement of the front and rear frames、Ability to generate intermediate frames that should have existed in between。
in particular、
1Compare the first frame and the next frame
↓
Analyze the movement of the subject
↓
Predict the images that should be on the way
↓
Generate non-existent frame
perform the process。
By this、
- movement of a person
- swaying hair
- movement of cloth
- background moving
- camera work
etc. naturally lead to。
To compensate for missing frames due to slow motion、Significantly improves image smoothness。
Step 4：Run the rendering
Processing is not completed just by setting optical flow.。
If you look at the top of the timeline, a red bar will appear。
this is、
"The interpolation frame calculation has not yet been completed."
means。
Therefore, perform rendering at the end.。
Work procedure
- Click "Sequence" on the menu bar
- Click "Render In to Out"
- Wait until processing is complete
- Wait until the progress bar reaches 100%
Once the process is complete, the red bar will turn green.。
This completes frame generation using optical flow.。
State after rendering
When playing after rendering、
The video that was originally 30fps、
The image changes to a smooth image that looks as if it was shot with a high frame rate camera from the beginning.。
Elements that can be improved easily、
- swaying hair
- Movement of dresses and costumes
- movement of people
- camera pan
- camera dolly
- wrap around background
- interior expression
Etc。
Reduces stuttering and discomfort peculiar to AI videos。
Memo at the time of export
Export the video after editing is complete。
Export procedure
file
↓
Start writing
↓
media
select。
There are certain items to check at this time.。
frame rate
- 60fps
- 59.94fps
Make sure that。
If this remains at 30fps、The interpolated frames generated are not fully utilized.。
Maintain 60fps until final output。
summary
High-efficiency models like Kling AI's "Video 2.5 Turbo"、Generate high-quality videos at low cost。
On the other hand, if you convert 30fps material into slow motion as is, stuttering will occur due to insufficient frames.。
As a countermeasure、
- Change sequence to 60fps
- Change speed to 50%
- Apply optical flow
- perform rendering
- 60Export in fps
Use the workflow called。
While reducing costs on the AI generation side、Maximize video quality on Premiere Pro side。
This way of thinking will be a very effective method for future AI video production.。
especially、
- swaying hair
- Character expression
- interior footage
- Cinematic production
- wrap around background
Effective when you want to look beautiful。
Record the basic workflow when turning AI videos into practical-grade slow motion videos.。
