Apps
ffmpeg-static Cache
Many Node.js apps that depend on ffmpeg-static keep a local download cache under ffmpeg-static-nodejs so they do not fetch the FFmpeg executable on every install or first run. That cache typically contains the downloaded ffmpeg binary archive or extracted executable plus HTTP response metadata such as ETag, Last-Modified, and other request validation files used to decide whether a re-download is needed. Kudu removes these cached binaries and response metadata so the app can fetch a fresh copy on demand without touching projects, media files, accounts, or app settings.
Why clean ffmpeg-static Cache?
- A partial or interrupted ffmpeg-static download leaves a truncated executable or archive behind, which shows up as conversion jobs failing immediately with spawn errors or missing ffmpeg messages
- Stale HTTP validation metadata such as ETag or Last-Modified values can make the downloader trust an outdated cached binary, so an app keeps using an older FFmpeg build and users see unsupported codec or option errors
- Corrupted cached executables may trigger antivirus quarantines or Windows execution failures, leading to export or transcode features that never start even though the app is installed correctly
- Repeated app installs and updates can accumulate old ffmpeg-static payloads in the cache folder, wasting disk space and causing users to notice unusually large LocalAppData usage
- If a cached binary was downloaded for a previous package revision or interrupted during extraction, media processing can fail only on first use, then recover after the cache is cleared and the binary is fetched again
- Apps that shell out to ffmpeg-static may hang while repeatedly checking bad cache metadata or retrying a broken local binary, which users experience as stalled imports, thumbnails, or video export steps
What gets cleaned
Cache paths Kudu targets
Windows
%LocalAppData%/ffmpeg-static-nodejs/Cache |
Frequently asked
Common questions about ffmpeg-static Cache
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