Add docs for autoscale.

Update information for autorotate according to ffplay.

Signed-off-by: Linjie Fu <>
 doc/ffmpeg.texi | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index cd35eb49c8..b91da2b2b4 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -734,10 +734,6 @@ ffmpeg -dump_attachment:t "" -i INPUT
 Technical note -- attachments are implemented as codec extradata, so this
 option can actually be used to extract extradata from any stream, not just
-@item -noautorotate
-Disable automatically rotating video based on file metadata.
 @end table
 @section Video Options
@@ -819,6 +815,16 @@ Create the filtergraph specified by @var{filtergraph} and 
use it to
 filter the stream.
 This is an alias for @code{-filter:v}, see the @ref{filter_option,,-filter 
+@item -autorotate
+Automatically rotate the video according to file metadata. Enabled by
+default, use @option{-noautorotate} to disable it.
+@item -autoscale
+Automatically scale the video according to the resolution of first frame.
+Enabled by default, use @option{-noautoscale} to disable it. Each frame of
+the output raw video can be in different resolutions and is in need to be
+handled next.
 @end table
 @section Advanced Video options

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