ref: 330dd67b7b0619da57492ca24207425026b387f4
dir: /examples/force_keyframe.txt/
@TEMPLATE encoder_tmpl.c
Forcing A Keyframe
==================
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ INTRODUCTION
This is an example demonstrating how to control placement of keyframes
on a frame-by-frame basis.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ INTRODUCTION
Configuration
-------------
Keyframes can be forced by setting the VPX_EFLAG_FORCE_KF bit of the
flags passed to `vpx_codec_control()`. In this example, we force a
keyframe every 8 frames.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PER_FRAME_CFG
if(!(frame_cnt & 7))
flags |= VPX_EFLAG_FORCE_KF;
else
flags &= ~VPX_EFLAG_FORCE_KF;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PER_FRAME_CFG
Observing The Effects
---------------------
The output of the encoder examples shows a 'K' rather than a dot '.'
when the encoder generates a keyframe. Note that every 8 frames a 'K'
is output.