Use env cleaner in previewer and ffmpeg version query

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 # Changes
 
+## Fixes
+
+- Fix issues with ffmpeg in the Linux bundle if querying the version or using the previewer.
+
 ## Features
 
 - Webserver settings are now saved and the webserver may be automatically started on app launch. It also got an improved API that makes it easy for external apps to interact with the Syncer (like [this mod for Melody Mania](https://steamcommunity.com/sharedfiles/filedetails/?id=3181930801)).

src/usdb_syncer/utils.py

@@ -380,6 +380,7 @@ def get_media_duration(path: Path) -> float:
         stdout=subprocess.PIPE,
         stderr=subprocess.STDOUT,
         check=True,
+        env=subprocessing.get_env_clean(),
     )
     return float(result.stdout)
 
@@ -401,7 +402,11 @@ def get_ffmpeg_version() -> str | None:
         return None
 
     result = subprocess.run(
-        ["ffmpeg", "-version"], capture_output=True, text=True, check=False
+        ["ffmpeg", "-version"],
+        capture_output=True,
+        text=True,
+        check=False,
+        env=subprocessing.get_env_clean(),
     )
 
     output = result.stdout or result.stderr