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[FFmpeg-devel,2/2] doc/encoders.texi: add docs for trellis

Message ID 20190617134857.6799-1-linjie.fu@intel.com
State New
Headers show

Commit Message

Fu, Linjie June 17, 2019, 1:48 p.m. UTC 
Signed-off-by: Linjie Fu <linjie.fu@intel.com>
---
 doc/encoders.texi | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/doc/encoders.texi b/doc/encoders.texi
index eefd124751..2e54dcc15f 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -2899,6 +2899,13 @@  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 trellis
+Trellis quantization can improve data compression in DCT-based encoding methods.
+It reduces the size of some DCT coefficients while recovering others to take their
+place. This process can increase quality by effectively finding the optimal
+quantization for each block to maximize the PSNR relative to bitrate.
+Set to off/I/P/B to disable or enable trellis quantization for I/P/B frames.
+
 @item rc_mode
 Set the rate control mode to use.  A given driver may only support a subset of
 modes.