SVG Transformations: Where?

[Julius Künzel]

Am 9. Dezember 2023 um 17:41 schrieb "John L. Poole" <prestopoole at proton.me>:

> 
> I created an SVG title page (see link below) where 
> 
> the new lines of text were combined into a single line 
> 
> that goes off the page. The
> 
> engine that handles the transformation from SVG to binary,
> 
> png?, is the culprit. I have professional experience
> 
> touching in this area and think I might be able to help and
> 
> that perhaps the problem I am experiencing is the cause
> 
> of possible other problems in transformations, though it
> 
> is with the Apache Batik project. I saw there
> 
> are several bugs relating to SVG.
> 
> I am new to KDEnlive and I am willing to help deal with the
> 
> specific issue of SVG transformations if I determine it is
> 
> a few hours of work. 
> 
> I cloned the KDEnlive code and started searching for "svg" and
> 
> found very little which suggests the project is relying on
> 
> a framework to handle to transformations.
> 
> Would someone be able to point me to the project which handles
> 
> the transformation? QTMultimedia?
> 
> Here's the sample I'm using as a test is at:
> 
>  [expires in 1 year]
> https://pastebin.com/sNanJFDk
> 
> I'm running KDEnlive on Gentoo Linux. Here's the package 
> 
> used to build my instance:
> 
>  [expires 1 year]
> https://pastebin.com/4it6CRxT
> 
> Thank you for your consideration.
> 
> John
> 

Hi John,

nice to hear you are interested to help!

Simply spoken Kdenlive is "just" a UI for MLT (https://www.mltframework.org/) which is a multimedia framework based on FFmpeg and used to do the rendering.

In https://github.com/mltframework/mlt/blob/3ffb57b99a62a6cd356e6548f233d4f683a4b21c/src/modules/core/loader.dict#L45 you can see that the qimage module of MLT is used for SVG files hence I suggest to use this as a starting point to investigate your issue further through the code base of MLT and maybe Qt.

I hope this helps. In case of technical / code related questions feel also free to open an issue on https://invent.kde.org/multimedia/kdenlive/-/issues

Looking forward to your contribution!
Julius


 https://invent.kde.org/jlskuz 
Julius Künzel
Volunteer KDE Developer, mainly hacking Kdenlive
KDE GitLab: www.invent.kde.org/jlskuz https://invent.kde.org/jlskuz 
Matrix: @jlskuz:kde.org https://go.kde.org/matrix/#/@jlskuz:kde.org
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