Video not playing in Quicktime when resolution is small

So I have a video that I need to be in the resolution 8×8. No matter which way I get it in this resolution, it just won’t display anything.

I tried exporting from Final Cut Pro and resizing the video with FFMPEG, but both just produce a black screen when played in QuickTime.

I’ve also tried some other media players and they work flawlessly.

Could there be any reason for that?

Here are some of my specs: MacBook Air 2019 (8GB of Ram, 1.6 GHz Dual-Core Intel Core i5), macOS BigSur 11.4 Beta

opengl – Very small line when two sprites are exactly next from eachother

Recently, I have been thinking about a hangout game, not really need to go into detail, because I am focusing on creating the engine itself. Basically just to make my brain not hurt while making the core game altogether.

I found a little problem, though.

Whenever I have two sprites EXACTLY next to eachother, there’s a weird small gap between them.

Here’s a picture:

enter image description here

Here’s another picture with the background white instead of black (eye strain warning for those dark mode users lol):

enter image description here

As you can see, there’s a tiny little gap between the sprites.

I know a very simple and easy solution would just to subtract the position by like one pixel, but it kind of ticks me off that its not evenly spaced.

Here’s my code containing the sprites and the rendering:

    public static void render() {
        test.setSpriteX(test2.getSpriteX() + 125f);
    public static void update() {

        test2 = new Sprite(-50, 0, new SpriteTexture() {new SpriteTexture("res/Tileset/wood.png")}, 0.1f, 125, 125, 100, false, true, "center");
        test = new Sprite(-50, 0, new SpriteTexture() {new SpriteTexture("res/Tileset/wood.png")}, 0.35f, 125, 125, 100, true, true, "center");
        button = new Sprite(0, 0, new SpriteTexture() {new SpriteTexture("res/buttonplacehold/button_trig_1.png")}, 0.0f, 125, 125, 100, false, true, "center");
        Logo = new Sprite(0, 0, new SpriteTexture() {}, 0.35f, 250, 250, 100, true, false, "center");
        T = new Sprite(0, 0, new SpriteTexture() {}, 0.35f, 50, 50, 100, true, false, "center");
        while (!Display.isCloseRequested()) {
            GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);

You don’t need to worry about the button sprite.

public Sprite(float sx, float sy, SpriteTexture() t, float speed ,int w, int h, int dms, boolean isStatic, boolean isDevMode, String o)

where sx is sprite x, sy is sprite y, t is list of textures for it, speed is just player speed if it’s a player, w is width, h is height, dms is delay in milliseconds, isStatic just makes it a player or not, isDevMode just turns on some debugging and fun things, and o is origin, which isnt event implemented yet or won’t be at all.

Hope somebody can help,


Also here are the parameter definitions for the Sprite class, so you don’t get mixed up:

micropayments – receiving a small refund

I was joining a website and asked pay with bitcoin and they say they will refund a tiny bit back to me and the last 4 digits will be my passcode.

Is this even possible? how would there computer know what code or wallet they would be sending it back to.

As from what i know from selling and receiving bitcoin always needs a new code which they haven’t asked for.

Small HTML/CSS fixes to website

I need someone to sort out some text which isn't aligned properly next to some icons. I also need someone to make the website compatible with mobile/smaller screens. Finally, I need the navbar to collapse on smaller screens. Please PM me if you are interested (the website is currently offline – I prefer someone does the work live on skype/teamviewer).

My Budget is $20 for this.

ca.classical analysis and odes – A small question regarding a type of PDE

In doing optimal control of Parabolic PDE’s we often have to solve a problem like that:

$$left{begin{array}{lr} dfrac{partial y}{partial t}-dDelta y(t,x)=f(y(t,x),p(t,x)) & (t,x)in (0,T)timesOmega \ dfrac{partial p}{partial t}(t,x)+dDelta p(t,x)=g(y(t,x),p(t,x)) & (t,x)in (0,T)timesOmega \ dfrac{partial y}{partialnu}(t,x)=dfrac{partial p}{partial nu}(t,x)=0 & (t,x)in (0,T)timespartialOmega \ y(0,x)=y_0(x), p(T,x)=p_T(x) & xinOmegaend{array}right.$$

where $Omegasubseteqmathbb{R}^2$ or $mathbb{R}^3$ is a bounded connected set with smooth boundary, and $y,p:(0,T)timesoverline{Omega}to mathbb{R}$ are the primal and the dual state. Here $f,g$ are two smooth functions from $mathbb{R}^2$ to $mathbb{R}$. Also $y_0$ and $p_T$ are two given smooth functions.

How can we deduce the existence and the properties of the solution?

The difficulty is that if we denote $q(t,x)=p(T-t,x)$ (to transform the problem into an INITIAL VALUE PROBLEM) we came across the following system:

$$left{begin{array}{lr} dfrac{partial y}{partial t}-dDelta y(t,x)=f(y(t,x),q(T-t,x)) & (t,x)in (0,T)timesOmega \ dfrac{partial q}{partial t}(t,x)-dDelta q(t,x)=g(y(T-t,x),q(t,x)) & (t,x)in (0,T)timesOmega \ dfrac{partial y}{partialnu}(t,x)=dfrac{partial q}{partial nu}(t,x)=0 & (t,x)in (0,T)timespartialOmega \ y(0,x)=y_0(x), q(0,x)=p_T(x) & xinOmegaend{array}right.$$

which looks as a DELAYED PDE. If the terms with $T-t$ would not have appeared then the existence would have been insured by the classical results in A. Pazy – Semigroups of Linear Operators and Applications to Partial Differential Equations

The problem can be implemented numerically via finite differences for example resulting a system of equations, but I wonder if this type of problems has been studied in a theoretical fashion.

I will be thankful for any reference or advice!

corporate policy – Cyber Essentials at a small business (20 employees) that keeps all business data within SaaS


I’ve recently joined a rapidly growing small business (from 4 to 20 people in last 12 months) with a very DIY IT setup. It’s fallen to me (I’m a developer so I just happen to be sitting nearest IT world…) to improve their security and specifically we are aiming to achieve compliance with Cyber Essentials (we are in the UK).

The general mode of operation is that every employee is on a MacOS or Windows8+ laptop (some purchased by the company, some personal devices), and all work takes place within Google Workspace. People also connect to Google Apps like Gmail on their personal phones. There is an internet connection and wireless router in the office, but not other infrastructure to speak of.

The Question

I have prepared a long list of “to-do’s” for the users of these laptops which would bring them in line with Cyber Essentials requirements, but I wondered what the guidance would be on employees “self-managing” these things (with formal training, assistance and regular check-ins). There is no device management in place and everyone just uses them like their own devices.

It could make sense to recall, wipe, set up device management of some sort, and re-issue the laptops to employees – but this would be incredibly disruptive and met with much resistance so I am keen to either avoid that or make sure I am 100% sure before requesting it.

I wondered if the protections offered by Google Workspace’s endpoint protection/device management would be considered sufficient, given that business data never leaves Google Workspace (and indeed the new policy would be that this act would be a HARD no for employees!). Obviously this leaves tasks like running updates, keeping security features turned on, etc up to the employee – but that’s no different to a BYOD situation – right?

I would be keen to know if anyone out there has been in a similar position. I do feel like the hard way is probably the right way but any advice would go a long way to helping my argument for this with management.

❓ASK – Where can i buy bitcoin small quantity with low fees? | Proxies-free

hey guys,
Do you know of a website where i can buy cryptos in low fees or no charges at all online here in the us


1)CEX.IO – This scores highly in all regards. It is very popular, easy to use, and a one stop shop for everything you will need on a platform. Additionally, their trading fees are low and clearly disclosed. ( )

2)Coinbase – This is an obvious second runner up. It is one of the most trusted exchanges around. The only downside to Coinbase is that you are only allowed to trade a few cryptos. I believe they are offering 15 crypto currencies at the moment and their fees tend to be on the higher side, however they are still very competitively priced

matrix – Small problem with TensorReduce


$eq=-frac{1}{2} text{$varpi $1}^T.text{J1}.text{$varpi $1}-frac{1}{2} Omega^T.text{jp}.Omega+frac{1}{2}left(text{Jp}+text{Jp}^Tright)^T.Omega$

where $J1$, $jp$ and $Jp$$3 times 3$ matrices.

$text{$varpi $1}$ and $Omega$$3 times 1$ vectors.

I want to get such result, i.e. force parenthesis $Omega$:

$eq=(frac{1}{2}left(text{Jp}+text{Jp}^Tright)^T-frac{1}{2} Omega^T.text{jp}).Omega-frac{1}{2} text{$varpi $1}^T.text{J1}.text{$varpi $1}$

But the TensorReduce doesn’t work. I understand why this is not happening – Mathematica is not clear if the expression in parentheses has the same dimension.

Is there any way to get around these restrictions?

eq = 1/2 Transpose(Transpose(Jp) + Jp).(CapitalOmega)(t) - 
   1/2 Transpose((CurlyPi)1(t)).J1.(CurlyPi)1(t) - 
   1/2 Transpose((CapitalOmega)(t)).jp.(CapitalOmega)(t) // 

How to convert a large dynamic virtualbox VDI image to a small img file?

I have a VirtualBox dynamic image of Xubuntu 20.04 of maximum size 70 GB. The current size of the image is 9 GB.

When I try to convert it to a .img file with the command
VBoxManage clonehd 'xubuntu.vdi' xubuntu.img --format RAW

the image size keeps growing far beyond 9 GB, and it would probably go on until 70 GB.

How to turn it into an image of size 9 GB?

The host OS is Kubuntu 20.04.