fix(player): use absolute path for video files (#575)

* Fixed #574
- manim-slides player now uses absolute paths for video

* Updated CHANGELOG.md

* chore(fmt): auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Minor changes

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Jérome Eertmans <jeertmans@icloud.com>

Author: 3 people

CHANGELOG.md

@@ -25,6 +25,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Update the template in the *Customize your RevealJS slides* section.
   [#565](https://github.com/jeertmans/manim-slides/pull/565)
 
+(unreleased-fixed)=
+### Fixed
+
+- Fixed black videos on macOS (Qt player) by forcing absolute paths for video files.
+  [@albertocasagrande](https://github.com/albertocasagrande) [#575](https://github.com/jeertmans/manim-slides/pull/575)
+
 (v5.5.2)=
 ## [v5.5.2](https://github.com/jeertmans/manim-slides/compare/v5.5.1...v5.5.2)
 

manim_slides/present/player.py

@@ -390,7 +390,7 @@ def playing_reversed_slide(self, playing_reversed_slide: bool) -> None:
     """
 
     def load_current_media(self, start_paused: bool = False) -> None:
-        url = QUrl.fromLocalFile(str(self.current_file))
+        url = QUrl.fromLocalFile(str(self.current_file.resolve(strict=True)))
         self.media_player.setSource(url)
 
         if self.playing_reversed_slide:
@@ -475,7 +475,7 @@ def slide_changed_callback(self) -> None:
 
     def preview_next_slide(self) -> None:
         if slide_config := self.next_slide_config:
-            url = QUrl.fromLocalFile(str(slide_config.file))
+            url = QUrl.fromLocalFile(str(slide_config.file.resolve(strict=True)))
             self.info.next_media_player.setSource(url)
             self.info.next_media_player.play()