Muxer ogg [Ogg]:
    Common extensions: ogg,ogv,spx,opus.
    Mime type: application/ogg.
    Default video codec: theora.
    Default audio codec: flac.
Ogg muxer AVOptions:
-oggpagesize       <int>        E..... Set preferred Ogg page size. (from 0 to 65025)
-pagesize          <int>        E..... preferred page size in bytes (deprecated) (from 0 to 65025)
-page_duration     <int>        E..... preferred page duration, in microseconds (from 0 to I64_MAX)

