Cache audio waveforms and rescue oversized GIF previews

2026-09-16 23:48:17 +02:00
parent caf9b7db3a
commit 8f30ec14ad
7 changed files with 123 additions and 5 deletions
@@ -130,7 +130,12 @@ Previews run after every walk:
  10 s timeout, one attempt).
 - Animated GIF previews are stored as a static first frame (`ffmpeg`, 480px WebP); the original
  animated GIF URL stays in `preview_url` for hover playback. Tenor embeds without a thumbnail are
-  resolved through Tenor's oEmbed.
+  resolved through Tenor's oEmbed. An animated GIF over the size cap is framed by ffmpeg reading
+  the stream directly, so it is not lost to `too large`.
+- Audio attachments and voice messages get a waveform strip
+  (`ffmpeg -filter_complex showwavespic`) as their preview, rendered by ffmpeg from the URL.
+- Transient network failures are left pending for the next backfill pass; only skips (4xx, too
+  large, no source) are marked permanent.
 - One attempt per row, no retries; a failure marks `preview_error` and never fails the scrape.
 - Stored by hash in `thumbs/<sha256>.<ext>`, where the extension follows the response type
  (`preview_ext`, default webp); `preview_hash` and `preview_bytes` land on the row, and the