fn main() {
let features = [
cfg!(feature = "mp4"),
cfg!(feature = "avi"),
cfg!(feature = "flv"),
cfg!(feature = "mov"),
cfg!(feature = "mpeg"),
cfg!(feature = "webm"),
cfg!(feature = "wmv"),
];
if !features.iter().any(|&enabled| enabled) {
eprintln!("Error: At least one feature must be enabled.");
std::process::exit(1);
}
}