ffmpeg查询是否有某个选项

 ffmpeg -h full |grep “thread”

-filter_threads     number of non-complex filter threads
-filter_complex_threads  number of threads for -filter_complex
-thread_queue_size  set the maximum number of queued packets from the demuxer
     thread_ops                   .D.VA.... threading operations
  -threads           <int>        ED.VA.... set the number of threads (from 0 to INT_MAX) (default 1)
     auto                         ED.V..... autodetect a suitable number of threads to use
  -thread_type       <flags>      ED.VA.... select multithreading type (default slice+frame)
  -non_deterministic <boolean>    E..V..... Allow multithreading for e.g. context=1 at the expense of determinism (default true)
  -non_deterministic <boolean>    E..V..... Allow multithreading for e.g. context=1 at the expense of determinism (default true)
  thread_type       <flags>      ..F...... Allowed thread types (default slice)
  threads           <int>        ..F...... Allowed number of threads (from 0 to INT_MAX) (default 0)