identically 1.
@item g @var{integer} (@emph{encoding,video})
-Set the group of picture size. Default value is 12.
+Set the group of picture (GOP) size. Default value is 12.
@item ar @var{integer} (@emph{decoding/encoding,audio})
Set audio sampling rate (in Hz).
Deprecated, use mpegvideo private options instead.
@item threads @var{integer} (@emph{decoding/encoding,video})
+Set the number of threads to be used, in case the selected codec
+implementation supports multi-threading.
Possible values:
@table @samp
-@item auto
-detect a good number of threads
+@item auto, 0
+automatically select the number of threads to set
@end table
+Default value is @samp{auto}.
+
@item me_threshold @var{integer} (@emph{encoding,video})
Set motion estimation threshold.