bug: [ft.VideoPlayer] media_kit's glibc leaks memory on GNU/Linux

[Dejv311]

Duplicate Check

• I have searched the opened issues and there are no duplicates

Describe the bug

The bug is documented and described in this thread:

media-kit/media-kit#68

When dismissing the VideoPlayer control, the underlying media_kit package does not free up the memory. The attached thread solves this issue by using a different memory allocation library; see answer media-kit/media-kit#68 (comment).

This is probably related to the following open issue: #6106

Code sample

import asyncio
import warnings

import flet as ft
import flet_video as fv

DELAY_S = 5

VIDEO_A = "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerJoyrides.mp4"
VIDEO_B = "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerMeltdowns.mp4"

class SwapView(ft.View):
    def __init__(self, route: str, next_route: str, bgcolor: str, video_url: str):
        super().__init__(route=route, bgcolor=bgcolor, padding=20)

        self._next_route = next_route
        self._running = False
        self._task = None

        self.video = fv.Video(
            playlist=[fv.VideoMedia(resource=video_url)],
            playlist_mode=fv.PlaylistMode.SINGLE,
            autoplay=True,
            muted=True,
            fit=ft.BoxFit.CONTAIN,
            show_controls=True,
        )

        self.controls = [
            ft.Text(f"Route: {route}", size=20, weight=ft.FontWeight.BOLD),
            ft.Text(f"Auto-switch to: {next_route} in {DELAY_S}s"),
            ft.Row(
                [
                    ft.Button("Go /a", on_click=lambda e: self.page.go("/a")),
                    ft.Button("Go /b", on_click=lambda e: self.page.go("/b")),
                ]
            ),
            ft.Container(height=360, bgcolor=ft.Colors.BLACK, padding=10, content=self.video),
        ]

    def did_mount(self):
        self._running = True
        self._task = self.page.run_task(self._auto_switch)

    def will_unmount(self):
        self._running = False
        if self._task:
            try:
                self._task.cancel()
            except Exception:
                pass

    async def _auto_switch(self):
        await asyncio.sleep(DELAY_S)
        if self._running and self.page:
            self.page.go(self._next_route)


def main(page: ft.Page):
    page.title = "Video memory leak test"
    page.padding = 0

    def route_change(e: ft.RouteChangeEvent):
        page.views.clear()

        if page.route == "/b":
            page.views.append(SwapView("/b", "/a", ft.Colors.GREEN_200, VIDEO_B))
        else:
            page.views.append(SwapView("/a", "/b", ft.Colors.BLUE_200, VIDEO_A))

        page.update()

    page.on_route_change = route_change
    page.go("/a")


ft.run(main)

To reproduce

Dismiss VideoPlayer control repeatedly.

Expected behavior

No response

Screenshots / Videos

No response

Operating System

Linux

Operating system details

Ubuntu 25.10

Flet version

0.80.5

Regression

No, it isn't

Suggestions

No response

Logs

Additional details

No response