--extractor-descriptions Output descriptions of all supported extractors
--proxy URL Use the specified HTTP/HTTPS proxy
--no-check-certificate Suppress HTTPS certificate validation.
+ --cache-dir None Location in the filesystem where youtube-dl can
+ store downloaded information permanently.
+ ~/.youtube-dl/cache by default
+ --no-cache-dir Disable filesystem caching
## Video Selection:
--playlist-start NUMBER playlist video to start at (default is 1)