pub fn probe(policy: &FfmpegPolicy) -> AvailabilityExpand description
Check at BOOT whether the configured decoder can actually run.
Worth doing eagerly rather than discovering it on the first video request:
a deployment that enabled video decoding and does not have the binary is
misconfigured, and the operator should learn that while reading the
startup log — not from a user’s failed request an hour later. The check is
one -version invocation, so it costs nothing at boot.