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I am building an appointment scheduling page using the table-calendar widget. I can write appointments to a firebase collection/document. Now, I need to pull the appointments from the collection and display them as a list below the calendar.

I have used this code on another page and I actually copied if from there and am using it here. The code works on the other page but I am getting the error here. There are small differences in the 2 pages but not too many. What is causing this error?

Here is the code for the calendar page.

This sounds like an easy task, but I already spent hours on it. There're several posts with a similar headline, so let me describe my problem first. I have H264 encoded video files, those files show records of a colonoscopy/gastroscopy.

During the examination, the exterminator can make some kind of screenshot. You can see this in the video because for round about one second the image is not moving, so a couple of frames show the "same". I'd like to know when those screenshots are made.

So in the first place I extracted the image of the video:

I'm expected to get 55912 frames, but I get 3 extra frames. What changes should I make to my code to fix this issue?

The video file is 18fps (00:37:16.12). Maybe its because of that extra 0.60s?

Is there a way to set time limit to 37:16.12 instead of 37:16.60?

Code

I have this code that makes the icon rotate clockwise. I want to make it rotate anticlockwise. how can I do that?

I want to change title in appBar, when when I switch from one tab to another. In my current code do not do that because on change tab build is not called.

Thanks to all!!

I am trying to animate color using the AnimatedBuilder widget in Flutter.

I can use this builder widget to animate scale, translate, rotate by returning a Transform object. But I am lost to as how I can do this to animate color.

Note, I can animate color using the AnimatedContainer widget but I want to be able to do more complex animation using Intervals (e.g. in this case, fade in a color, wait a period of time, then fade back out).

Is this possible?

Thanks!

Just wondering if it's possible to pass byte data from io.
I'm trying to extract frames from a gif with ffmpeg then use Pillow to resize it.
I know you can extract frames from a gif with Pillow, but sometimes it butchers certain gifs. So I'm using ffmpeg as a fix.
As for why I'd like the gif to be read from memory is because I'm going to change this so gifs from urls will be wrapped in Bytesio instead of saving.
As for why I have the extra Pillow code, I did successfully get it working by passing an actual filename into the ffmpeg command.

i've a problem with "nullable expression". The problem is in theese two lines: left: isSideBarOpenedAsync.data ? 0 : 0, and right: isSideBarOpenedAsync.data ? 0 : screenWidth - 35, i'm trying to open with an animation the sidebar menu. Some idea to fix that? Ty.

This is the error: Error: A value of type 'bool?' can't be assigned to a variable of type 'bool' because 'bool?' is nullable and 'bool' isn't.

[enter image description here][1]I want to have 2 different text widgets slide in one after the other (e.g. title and subtitle) automatically when the screen loads.

Seems simple enough!

I can achieve this animation effect easily by writing the code used to support a SlideTransition. And then duplicating this as per the code snippet below (e.g. 2 animition controllers, 2 animation objects, 2 slide transition widgets). With the 2 animation controllers wrapped in a future delay set at two slightly different times. However, this seems like a very inefficent way to achieve this simple task.

Note: I have tried and failed achieving this effect with using TweenSequence (which appears suited for multiple animations on the SAME object).

I also made this work using an Animated List, but again the amount of extra code to support an animated list seemed over-the-top for 2 widgets.

Does anyone know what the preferred way / less verbose way to achieve this would be (preferably with just one animationcontroller)?

Thanks!!