stutter | Rapid Serial Visual Presentation extension | Browser Plugin library

I have created a Camera using AVFoundation which is able to record video and audio using AVCaptureVideoDataOutput and AVCaptureAudioDataOutput. I create my capture session, attach all inputs and the video- and audio-data outputs, and the Camera then sits idle. The user is now able to start a video recording.

The problem with this is that immediately after I start the capture session (captureSession.startRunning()), the background music stutters. I assume this is because once the capture session starts running, the AVCaptureAudioDataOutput internally activates the AVAudioSession (AVAudioSession.setActive(...)), which I don't want it doing. I want it sitting idle (and not providing any audio output buffers) until I explicitly activate the Audio Session (once the user starts recording).

This is really annoying, since the Camera is the start-screen in our app and everytime the user opens or closes the app his music stutters.

I know that this is somehow possible because Snapchat works that way - you open the App and background audio smoothly continues to play. Once you start recording, there is a small stutter on the background music, but the Camera smoothly operates and starts recording once the short stutter is over.

My code:

I've coded a box shadow drop for images in my element where it'll respond to the position of the mouse. It works well if the box shadow effect were to run on only one element. However, when running on multiple elements it starts to lag/stutter. I am unclear as to what is causing it. I'm hoping someone can clarify it.

Here is a short video of what I'm experiencing:- https://drive.google.com/file/d/1ULahZWR5sKt-yaDEIjEvK3TFa1g1n65d/view

Attached is my code;

HTML:

I created the github.com project qjson/qjson-go that contains the package name qjson that you can see here. I named the github project this way because github.com/qjson/ contains other projects for different languages (e.g. qjson-c).

Unfortunately, I get the following error when I try to import the project as github.com/qjson/qjson-go:

I have a GridLayout inside of a ScrollView. The GridLayout contains about 25 images. The images are chosen at runtime so their sizes cannot be determined beforehand. These images are loaded asynchronously at different times ( there is at least a 500 millisecond difference between them ).

The problem occurs when the image is loaded and the size of the GridLayout changes. From what I understand, the ScrollView's scroll_y is set to some value relative to the original height of the GridLayout. Then, once the image has loaded the size of the GridLayout changes, but the scroll_y is still relative to the old height. This causes the ScrollView to scroll down by a large amount.

I've tried to rectify this by manually changing the scroll_y to match the new height. I'm using the following equation:

Equation for Finding New Scroll_Y

I'm subracting scroll_y from 1 because a scroll value of 1 is at the very top in kivy. I've reordered this equation to the following and have implemented this in code:

Simplified Equation for Finding New Scroll_Y

This has reduced the problem, and there is a less apparent jittering, but it still scrolls up by 5-10 pixels each time an image is loaded.

This is because I'm calculating the new height for the equation, based on:

• the old viewport height of the ScrollView
• the old height of the image widget
• the new height of the image.

But, this calculated height is slightly bigger than what the actual height turns out to be, causing my adjusted scroll_y to be slightly off. I'm not sure why the actual height is smaller.

I'm not sure where to go from here.

Here is a link to a repository that has a minimal reproducible example. Grid Stuttering Example

I'm currently trying to make the camera follow the player smoothly. The script works fine but the problem is that this script is causing the player to stutter at a certain point. For example, if the player is at X:3, the player would stutter but then if the player was at X:-6, the player would stop stuttering. I'm 100% sure that this script is the problem because if I remove the script, the player stops stuttering.

Here is the camera follow script:

whenever the player uses its jetpack or when there's a lot of velocity, the player stutters. I tried using interpolate and other things like that but the only outcome was even more stutter. If anyone knows what the cause for the stuttering is, please tell me and if you want to, maybe even explain your answer :)

here is what i mean by the player stuttering : https://www.youtube.com/watch?v=k6q3vvQtwjM

here is my player code :

I'm trying to implement Oboe library into my application, so I can perform low latency audio playing. I could perform panning, playback manipulation, sound scaling, etc. I've been asking few questions about this topic because I'm completely new to audio worlds.

Now I can perform basic things which internal Android audio class such as SoundPool provides. I can play multiple sounds simultaneously without noticeable delays.

But now I encountered another problem. So I made very simple application for example; There is button in screen and if user taps this screen, it plays simple piano sound. However fast user taps this button, it must be able to mix those same piano sounds just like what SoundPool does.

My codes can do this very well, until I taps button too much times, so there are many audio queues to be mixed.

From my research, I cannot seem to find anyone else with the same problem which leads me to believe I'm just committing an unholy amount of stupidity. Nonetheless, I'm working with the Java sampled sound API and I'm trying to play a simple 440Hz sine wave for 5 seconds. However, it seems as though the SourceDataLine is eating through the frames at twice the speed of its given AudioFormat framerate. The sample I'm using is: