Social Icons

Featured Posts

July 30, 2018

Build Wireshark in CentOS 7

First, download the source code for the latest stable release from the Wireshark download page. We will use release 2.6.2 in this example.

sudo yum install gcc gcc-c++ lz4-devel snappy-devel libnghttp2-devel libpcap-devel
sudo yum install qt-devel libtool qt5-qtbase-devel qt5-qtmultimedia-devel
sudo yum install qt5-linguist desktop-file-utils
cd wireshark-2.6.2
make all
sudo make install

August 13, 2017

H.264/AVC Video Compression on Smartphones

In this paper we studied the usage of H.264/AVC video compression tools by the flagship smartphones. The results show that only a subset of tools is used, meaning that there is still a potential to achieve higher compression efficiency within H.264/AVC standard, but the most advanced smartphones are already reaching compression efficiency limit of H.264/AVC.
Published in: Sharabayko M.P., N.G. Markov. H.264/AVC Video Compression on Smartphones. Journal of Physics: Conference Series. Vol. 803, 2017: Information Technologies in Business and Industry (ITBI2016).

August 7, 2016

Contemporary Video Compression Standards. H.265/HEVC, VP9, VP10, Daala

In this paper we compare compression efficiency of the latest video coding standards H.265/HEVC, VP9, VP10 and Daala to H.264/AVC with the help of reference video encoders available.

This blog post deliberates on the results published in our research paper:
Sharabayko M.P., Markov N.G. Contemporary Video Compression Standards. H.265/HEVC, VP9, VP10, Daala. Control and Communications (SIBCON), 2016 International Siberian Conference on, Moscow, 12-14 May, 2016, pp. 1-4.
that can be found on IEEE Xplore.

January 18, 2016

Fast YUV to RGB conversion in Python 3

This Python scripts implements fast matrix-based conversion from YUV to RGB colospace. Conversion from YV12 (YUV420) requires one extra line of code to perform up-sampling of chroma planes.

July 12, 2015

A Python script evaluating PSNR metric of two YUV420 frames

A script evaluating PSNR metric of two YUV420 frames.
usage: filename1.yuv filename2.yuv frame_width frame_height
Alternatively if filename1 contains width and height in the form file-1200x1600.yuv,
the script will extract width and height of a frame from the filename. Then usage even simplier: filename1-1200x1600.yuv filename2.yuv

November 17, 2014

The maturity of H.265/HEVC video compression on the study of X265 v.1.4

In this post I share my test results on x265 coding efficiency to track the development progress. The x265 version 1.4 was used for this test, as well as the JCT-VC test sequences. It is worth mentioning that the Class E sequence set has changed, as described in JCTVC-O0022. However, for backward compatibility of the test results I still use the old test sequences set.