Identifies the strategy used to probe a media URL.
EXTENSION_PROBE
HEAD_REQUEST_PROBE
Content-Type
METADATA_RESOLVE
Identifies the strategy used to probe a media URL.
EXTENSION_PROBE: Infers the format from the URL file extension.HEAD_REQUEST_PROBE: Sends an HTTP HEAD request and reads theContent-Typeheader.METADATA_RESOLVE: Fetches deeper media metadata (e.g. frame rate, codec) by partially downloading the file.