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Performance: GZip, Cache-Control, WebP, SQLite-Tuning, Indizes, srcset — SW by-v438, APP_VER 417

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rene 2026-04-26 17:40:18 +02:00
parent 5bd07d9598
commit e0c2b2bdc1
10 changed files with 46 additions and 12 deletions
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8
backend/media_utils.py
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@ -162,7 +162,7 @@ _PREVIEW_MAX = 800 # längste Seite in Pixeln
def generate_preview(data: bytes, ext: str) -> bytes | None:
"""Erzeugt ein JPEG-Preview (max _PREVIEW_MAX px). Gibt None zurück bei Videos/PDFs/Fehler."""
"""Erzeugt ein WebP-Preview (max _PREVIEW_MAX px). Gibt None zurück bei Videos/PDFs/Fehler."""
if ext.lower() not in _PREVIEW_EXTS:
return None
try:
@ -172,7 +172,7 @@ def generate_preview(data: bytes, ext: str) -> bytes | None:
img = img.convert("RGB")
img.thumbnail((_PREVIEW_MAX, _PREVIEW_MAX), Image.LANCZOS)
buf = io.BytesIO()
img.save(buf, format="JPEG", quality=72, optimize=True)
img.save(buf, format="WEBP", quality=80)
return buf.getvalue()
except Exception:
return None
@ -185,11 +185,11 @@ def preview_url_from(url: str | None) -> str | None:
return None
low = url.lower()
if any(low.endswith(s) for s in (
".mp4", ".webm", ".mov", ".avi", ".pdf", "_thumb.jpg", "_preview.jpg"
".mp4", ".webm", ".mov", ".avi", ".pdf", "_thumb.jpg", "_preview.jpg", "_preview.webp"
)):
return None
base, _ = os.path.splitext(url)
return base + "_preview.jpg"
return base + "_preview.webp"
def extract_video_thumb(video_path: str) -> str | None: