yjxiong

To use OpenCV's VideoWriter class to write an H264 encoded video, one would encounter some error like

Could not open codec libx264: unspecified error

Here is the trick. Beforehand, one has to make sure

• --enable-libx264 is switched on in ffmpeg
• OpenCV is downloaded in sources.

yjxiong

version="2.4.12"

echo "Installing OpenCV" $version
mkdir OpenCV
cd OpenCV

echo "Removing any pre-installed ffmpeg and x264"
sudo apt-get -qq remove ffmpeg x264 libx264-dev

echo "Installing Dependenices"

yjxiong

%% This part goes in preamble
\newcommand{\dummyfig}[1]{
  \centering
  \fbox{
    \begin{minipage}[c][0.33\textheight][c]{0.5\textwidth}
      \centering{#1}
    \end{minipage}
  }
}

yjxiong

"""
Light weight head pose estimation with SolvePnP

Author: Yuanjun Xiong
"""

# parameters
fx = 1

# model points

yjxiong

import cv2
import sys
 
(major_ver, minor_ver, subminor_ver) = (cv2.__version__).split('.')
assert minor_ver >= 2, "Must use opencv 3.2.x up"
 
if __name__ == '__main__' :
 
    # Set up tracker.
    # Instead of MIL, you can also use