Add docs for max_frame_size option.

Signed-off-by: Linjie Fu <>
 doc/encoders.texi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index eefd124751..ea43900e91 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -2899,6 +2899,12 @@ will refer only to P- or I-frames.  When set to greater 
values multiple layers
 of B-frames will be present, frames in each layer only referring to frames in
 higher layers.
+@item max_frame_size
+Set the allowed max size in bytes for each frame. If the frame size exceeds
+the limitation, encoder will adjust the QP value by adding delta_qp for each 
+pass to control the frame size. To simplify the usage, delta_qp is set to
 @item rc_mode
 Set the rate control mode to use.  A given driver may only support a subset of

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