Install sox tool with mp3 support:
apt-get install sox apt-get install libsox-fmt-mp3 sox file.mp3 file.wav
Basically that is all, but if you need to check resulting wav file parameters like channels, sample rate, precision, duration, bit rate, etc…, use soxi command:
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First, I tried Valgrind tool using the following command:
valgrind --tool=memcheck --leak-check=yes ./app
With some large QT application started for some short period I got the following output:
==7090== HEAP SUMMARY:
==7090== in use at exit: 5,623,365 bytes in 36,268 blocks
==7090== total heap usage: 32,454,680 allocs, 32,418,412 frees, 12,822,939,874 bytes allocated
................................
==7090== LEAK SUMMARY:
==7090== definitely lost: 20,163 bytes in 74 blocks
==7090== indirectly lost: 60,053 bytes in 1,273 blocks
==7090== possibly lost: 396,167 bytes in 2,169 blocks
==7090== still reachable: 4,834,822 bytes in 31,576 blocks
==7090== suppressed: 0 bytes in 0 blocks
==7090== Reachable blocks (those to which a pointer was found) are not shown.
==7090== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==7090==
==7090== For counts of detected and suppressed errors, rerun with: -v
==7090== Use --track-origins=yes to see where uninitialised values come from
==7090== ERROR SUMMARY: 20905 errors from 1583 contexts (suppressed: 15 from 2)
Below I provided parameters of three Android phones I tested my Lines game with:
| Android Version | Screen Resolution | Pixel Ratio | DPI | Screen Size |
|---|---|---|---|---|
| 4.4? | 320×496 (480×744/706) | 1.5 | 156.89 | 52×80 mm |
| 4.4? | 360×592 (540×888/850) | 1.5 | 160.19 | 57×94 mm |
| 6.0 | 360×592 (720×1184/1136) | 2.0 | 160.19 | ~68×123 mm |
| N/A | 800×1232 | 1.0 | 188.3295 | 108×166 mm |
Screen Resolution column contains the information in the following format: <logical resolution> (<physical resolution>/<physical height available for applications in portrait orientation>.
DPIs with ‘~’ sign are measured manually because QT (or some Android API) provides incorrect Screen Size.
Fist install MySQL client libraries and check their location:
apt-get install libmysqlclient-dev find / -name '*libmysqlclient*'
Then install SQLite:
sudo apt-get install sqlite3 libsqlite3-dev
Extract GDAL sources and configure supported modules (MySQL and SQLite are not compiled by default, so we need to specify them explicitly):
unzip gdal211.zip cd gdal-2.1.1/ ./configure --with-sqlite3 --with-mysql
this will output “MySQL support: yes” and “SQLite support: yes” along with other information.
VS2015 has an exciting ability to debug a C++ application on Android Emulator, but in this article I will talk about no less exciting and more time expensive ability to debug a C++ application on a real Android device. The first thing we need to spend the time with is figuring out how to enable USB debugging mode on our Android device. On my ASUS Zenfone I need to go to Settings->About->Software Information and tap on Build Number 7 times, after that I have USB debugging check box in Settings->Developer Options that I should tap as well:
Cross platform (Android, iOS, UWP) OpenGLES 2 application can be easily created in VS2015 using “OpenGLES 2 Application (Android, iOS, Windows Universal)” project template:
Probably it is a trivial question, but the answer is not always obvious. The main rule is to follow the right link like this: https://www.java.com/en/download/help/firefox_online_install.xml. As the result you will get:
To check if it works or not follow this link: http://java.com/en/download/installed8.jsp.
Today I updated my FireFox browser and Joomla 1.5x administrator panel stopped working in it. Looks like Joomla 1.5x administrator panel contains some staff that prevents it from working in all modern browsers except Internet Explorer, or at least Internet Explorer is the only browser that displays message “Only secure content is displayed.” and button “Show All Content” enabling some insecure mode. To eliminate the need of pressing this button each time I open new page in administrator panel I went to “Internet Options->Security Tab->Miscellaneous->Display mixed content” and chose “Enable”:
Today I accidentally changed permissions of all the files in some folder /usr/lib/git-core with the following command:
chmod o-rx *
At first I thought that I have broken my system, but in few minutes I remembered that I have the same distribution on some other machine, I listed the same folder on this machine and used the following commands to restore original permissions:
chmod o+rx *
find -maxdepth 1 -type f -perm 645 -exec chmod o-x {} \;
645 means the files that initially were -rw-r–r— and became -rw-r–r-x. This two commands saved me a lot of time. After that I even count the number of files with all permission combinations:
find -maxdepth 1 -type f -perm 644 | wc -l find -maxdepth 1 -type f -perm 755 | wc -l find -maxdepth 1 -type f -perm -o=x | wc -l
Git is a good alternative for developers who need a version control supported on both Windows and Linux platforms. Below I provided basic steps for installing Git on Ubuntu 12.04 and enabling HTTP access to the repositories with Nginx web server.
First, we need to install Nginx and Git packages:
apt-get install nginx git
by default Nginx processes will run as www-data, (check “user” keyword in /etc/nginx/nginx.conf configuration file). Git installation has not created any user yet.
