[InvalidParameter] Failed to download https://…, with the same file sometimes succeeding and sometimes failing. We reproduced it: the model service fetches the media URL directly from your origin, and reports this error when that fetch times out. File integrity, API key, and parameters are not involved.
For the same 1.5 MB reference video we measured about 1.4 MB/s from a US node (1.1 s) but only 6–11 KB/s from a mainland China node (150–240 s). The model-side download deadline is on the order of 3 minutes, so the file sits right on the line — hence the intermittent behavior. Larger files fail far more reliably.
What to do: host source media on a CDN or object storage in Hong Kong, Singapore, or Japan, keep files under 3 MB, and make sure the URL is publicly reachable and returns a complete Content-Length. A mainland China CDN requires an ICP filing, which overseas domains usually do not have.
See the new FAQ for the full diagnostic checklist.
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