rLottie/community

rlottie Q&A, issues, development discussion

Quan Nguyen

@nnquan

Hi there,

I am working with Blendmode in Precomps Layer. I found that rlottie only supports Blendmode 1,2,3 ( lottieparser.h line 610 model::BlendMode LottieParserImpl::getBlendMode() ). Currently I need to use Blendmode 9 SoftLight. What files do I need to work with to do this?

Subhransu

@smohantty

@nnquan , unfortunately rlottie dosen't support other blend modes.

Quan Nguyen

@nnquan

Yes, I hope that the blend mode is developed in the future.

rebornfz

@rebornfz

Hello, Where can I get rlottie's api documentation？

rebornfz

@rebornfz

How do I output a video?

Hermet Park

@hermet

@rebornfz hello, you can check header files in the project

@rebornfz https://github.com/Samsung/rlottie/tree/master/inc

@rebornfz for the output, please read the basic guide doc first => https://github.com/samsung/rlottie#readme

@rebornfz then check samples in the rlottie project => https://github.com/Samsung/rlottie/tree/master/example

rebornfz

@rebornfz

thank you

VaughanKM

@VaughanKM

Hello, I'm having some troubles with using rlottie for my project and I was hoping I could ask you for some help. I'm creating a windows application using Visual Studio 2015 with managed code (compiled with /clr, code generated using Multi-threaded DLL /MD), so to avoid the incompatibilities with the unmanaged library at compile time I wrote a wrapper library to access rlottie. I can create objects such as Surfaces and Animations in the library I created alright, but when I go to use functions such as loadFromFile it gives me heap access errors. Has anyone run into something similar?

Or is there another way to use the library with managed code without the need for a wrapper library?

Hermet Park

@hermet

@smohantty ping?

VaughanKM

@VaughanKM

I was able to solve the heap issue by porting my project to Visual Studio 2019, it's working great now. I guess the heap allocation is version dependent. Thanks for the speedy reply!

Hermet Park

@hermet

@VaughanKM great. thanks for your info!

rebornfz

@rebornfz

Hello，I change the code in lottie2gif.cpp to change the width and height.
Most of the time, it can run correctly.
But when I render this gif https://lottiefiles.com/43721-keywords, it went wrong when width/height > 400.
It run well when width/height = 400.

rebornfz

@rebornfz

When the size is 200*200, most of them are fine.
Errors often occur when the size is increased

Hermet Park

@hermet

@rebornfz you might change the size in wrong way.

@rebornfz buffer memory size and specified size must be identical.

rebornfz

@rebornfz

I only change the width and height in the rlottie::Surface surface(buffer, width , height , stride)

@hermet

Hermet Park

@hermet

@rebornfz that's why... you just changed the number but didn't change the buffer memory.

@rebornfz please double check where buffer come from how it initialize the buffer memory

rebornfz

@rebornfz

@hermet sorry I've mispoken. This is my code:

@hermet player->size(w1, h1);
w = w1;
h = h1;
std::cout << w << " " << h << std::endl;
auto buffer = std::unique_ptr<uint32_t[]>(new uint32_t[w * h]);
size_t frameCount = player->totalFrame();

    GifBuilder builder(gifName.data(), w, h, bgColor);
    for (size_t i = 0; i < frameCount ; i++) {
        rlottie::Surface surface(buffer.get(), w, h, w * 4);
        player->renderSync(i, surface);
        builder.addFrame(surface);
    }

Hermet Park

@hermet

@rebornfz and you say, 200x200 works fine

@rebornfz what exact size has that issue?

rebornfz

@rebornfz

800*800, and It run well when width/height = 400.

@hermet

rebornfz

@rebornfz

@hermet Will reading json fail if there is an unsupported After Effects Features?

Hermet Park

@hermet

@rebornfz could be. but not usual.

i just forgot the size issue you requested. let me test now.

@rebornfz so did u use in the command ? $lottie2gif input.json 800x800

@rebornfz because i couldn't find any issue here. it perfectly works fine.

rebornfz

@rebornfz

@hermet I'll look again, maybe I was wrong

rebornfz

@rebornfz

@hermet I tried the lottie2gif input.json 800x800, and it core dumped

@hermet The gdb information: