add docs.

Signed-off-by: Linjie Fu <>
 doc/encoders.texi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index ef12c73ed5..e9887e13a6 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -2940,6 +2940,17 @@ Use CAVLC.
 @item aud
 Include access unit delimiters in the stream (not included by default).
+@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 delta_qp for each pass to control the 
frame size.
+@item pass_num
+Set number of passes, currently can support up to 4 passes.
+@item delta_qp
+Set delta QP for every pass. Every pass can have different QP, currently set 
equal delta_qp for
+each pass.
 @item sei
 Set SEI message types to include.
 Some combination of the following values:

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