Using FFMPEG to create an image for every second of a video

Hey guys,

Just a quick command I found on stackoverflow to take a still image/thumbnail out of a video every second:

ffmpeg -i video.avi -r 0.01979 -f image2 output_%05d.jpg

Thanks to this stackoverflow post: https://stackoverflow.com/a/14710478/522859

Start a Script on Startup – Raspberry Pi

Hey guys,

Just thought I’d leave a couple of links to some guides I came across for setting up boot scripts on a raspberry pi.

Quick guide on how to get them running: http://www.instructables.com/id/Raspberry-Pi-Launch-Python-script-on-startup/

How to delay the boot process until the network is available: https://raspberrypi.stackexchange.com/a/45774

Raspberry PI Keeps Booting into the Login Screen

Hey everyone,

A bit of weird issue today – my RaspberryPi kept reverting to the login screen. To get around this, open command prompt from the login screen (ctrl + f1) and then run sudo rm ~/.Xauthority

Reboot and then it should work normally.

 

Exit Raspberry Pi Camera Preview

Hey everyone,

I ran into a bit of a weird issue with a raspberry pi camera preview today. After starting the preview I hit an uncaught exception which meant that exitPreview was never called.

To get around this use the terminal hotkey and kill the python process. Note that while you won’t be able to see the terminal, it will be running in the background.

https://www.raspberrypi.org/forums/viewtopic.php?t=152239&p=998212
ctrl + alt + t
pkill python
pkill python3

Running ReadTheDocs on Windows

Hey everyone,

This is a quick guide on how to setup your own readthedocs server on Windows.

Install Python 2.7: https://www.python.org/downloads/

Install virtual env using pip via command prompt (run as administrator):
c:\Python27>python.exe scripts\pip.exe install virtualenv

Create a virtual environment:
c:\Python27>scripts\virtualenv.exe c:\readthedocs
c:\readthedocs\Scripts>activate.bat
(readthedocs) c:\readthedocs\Scripts>

Create a folder and clone the repository:
(readthedocs) c:\readthedocs\Scripts>md checkouts
(readthedocs) c:\readthedocs\Scripts>cd checkouts
(readthedocs) c:\readthedocs\Scripts\checkouts>git clone http://github.com/rtfd/readthedocs.org.git
Cloning into 'readthedocs.org'...
remote: Counting objects: 47896, done.
remote: Compressing objects: 100% (53/53), done.
remote: Total 47896 (delta 19), reused 0 (delta 0), pack-reused 47843
Receiving objects: 100% (47896/47896), 37.91 MiB | 8.76 MiB/s, done.
Resolving deltas: 100% (31783/31783), done.
Checking connectivity... done.

Get and install dependencies using pip:
(readthedocs) c:\readthedocs\Scripts\checkouts>cd readthedocs.org
(readthedocs) c:\readthedocs\Scripts\checkouts\readthedocs.org>git clone http://github.com/rtfd/readthedocs.org.git

Ran into the following error: no module named django.core.management (probably caused by having two version of python installed)
(readthedocs) c:\readthedocs\Scripts\checkouts\readthedocs.org>c:\Python27\python.exe c:\readthedocs\Scripts\pip.exe install django --upgrade
Collecting django
Using cached Django-1.10.2-py2.py3-none-any.whl
Installing collected packages: django
Successfully installed django-1.10.2
You are using pip version 8.1.1, however version 8.1.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' comm
and.

Build the database:
(readthedocs) c:\readthedocs\Scripts\checkouts\readthedocs.org>c:\Python27\pytho
n.exe C:\readthedocs\Scripts\checkouts\readthedocs.org\manage.py syncdb
Operations to perform:
Synchronize unmigrated apps: allauth, messages, django_extensions, django_grav
atar, rest_framework, annoying, textclassifier, corsheaders, copyright, privacy,
django_countries, humanize, rtd_tests, haystack, doc_builder, staticfiles, rest
api, bitbucket_oauth2, bitbucket, notifications, djangosecure, pagination, githu
b, djcelery, payments
Apply all migrations: core, account, builds, gold, sessions, admin, guardian,
tastypie, messages_extends, comments, sites, contenttypes, redirects, auth, tagg
it, oauth, bookmarks, donate, projects, socialaccount
Synchronizing apps without migrations:
Creating tables...
Creating table corsheaders_corsmodel
Creating table celery_taskmeta
Creating table celery_tasksetmeta
Creating table djcelery_intervalschedule
Creating table djcelery_crontabschedule
Creating table djcelery_periodictasks
Creating table djcelery_periodictask
Creating table djcelery_workerstate
Creating table djcelery_taskstate
Running deferred SQL...
Installing custom SQL...
Running migrations:
Rendering model states... DONE
Applying contenttypes.0001_initial... OK
Applying auth.0001_initial... OK
Applying account.0001_initial... OK
Applying account.0002_email_max_length... OK
Applying admin.0001_initial... OK
Applying contenttypes.0002_remove_content_type_name... OK
Applying auth.0002_alter_permission_name_max_length... OK
Applying auth.0003_alter_user_email_max_length... OK
Applying auth.0004_alter_user_username_opts... OK
Applying auth.0005_alter_user_last_login_null... OK
Applying auth.0006_require_contenttypes_0002... OK
Applying taggit.0001_initial... OK
Applying projects.0001_initial... OK
Applying builds.0001_initial... OK
Applying projects.0002_add_importedfile_model... OK
Applying bookmarks.0001_initial... OK
Applying builds.0002_build_command_initial... OK
Applying comments.0001_initial... OK
Applying core.0001_initial... OK
Applying core.0002_make_userprofile_user_a_onetoonefield... OK
Applying core.0003_add_banned_status... OK
Applying donate.0001_initial... OK
Applying donate.0002_dollar-drop-choices... OK
Applying donate.0003_add-impressions... OK
Applying donate.0004_rebase-impressions-on-base... OK
Applying donate.0005_add-geo-filters... OK
Applying donate.0006_add-geo-data... OK
Applying donate.0007_add-impression-totals... OK
Applying gold.0001_initial... OK
Applying guardian.0001_initial... OK
Applying messages_extends.0001_initial... OK
Applying sites.0001_initial... OK
Applying socialaccount.0001_initial... OK
Applying socialaccount.0002_token_max_lengths... OK
Applying oauth.0001_initial... OK
Applying oauth.0002_combine_services... OK
Applying oauth.0003_move_github... OK
Applying oauth.0004_drop_github_and_bitbucket_models... OK
Applying oauth.0005_add_account_relation... OK
Applying oauth.0006_move_oauth_source... OK
Applying oauth.0007_org_slug_nonunique... OK
Applying projects.0003_project_cdn_enabled... OK
Applying projects.0004_add_project_container_image... OK
Applying projects.0005_sync_project_model... OK
Applying projects.0006_add_domain_models... OK
Applying projects.0007_migrate_canonical_data... OK
Applying projects.0008_add_subproject_alias_prefix... OK
Applying projects.0009_add_domain_field... OK
Applying projects.0010_migrate_domain_data... OK
Applying projects.0011_delete-url... OK
Applying projects.0012_proper-name-for-install-project... OK
Applying projects.0013_add-container-limits... OK
Applying projects.0014_add-state-tracking... OK
Applying projects.0015_add_project_allow_promos... OK
Applying projects.0016_build-queue-name... OK
Applying projects.0017_add_domain_https... OK
Applying redirects.0001_initial... OK
Applying sessions.0001_initial... OK
Applying taggit.0002_auto_20150616_2121... OK
Applying tastypie.0001_initial... OK

Starting the readthedocs server:
D:\Users\ChrisO>C:\readthedocs\Scripts\activate.bat

(readthedocs) D:\Users\ChrisO>c:\Python27\python.exe C:\readthedocs\Scripts\chec
kouts\readthedocs.org\manage.py runserver
Performing system checks…

System check identified no issues (1 silenced).
October 21, 2016 – 11:16:17
Django version 1.8.3, using settings ‘readthedocs.settings.dev’
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.

Create a new readthedocsproject:
I followed this guide: http://read-the-docs.readthedocs.io/en/latest/getting_started.html#in-rst

Creating the new project:
C:\readthedocs>md whatibroke
C:\readthedocs>cd whatibroke
C:\readthedocs\whatibroke>C:\readthedocs\Scripts\sphinx-quickstart.exe
Welcome to the Sphinx 1.3.5 quickstart utility.

Please enter values for the following settings (just press Enter to
accept a default value, if one is given in brackets).

Installing a theme – sphinx_rtd_theme (optional step):
c:\readthedocs\Scripts>activate.bat
(readthedocs) c:\readthedocs\Scripts>cd c:\readthedocs\whatibroke
(readthedocs) c:\readthedocs\whatibroke>pip install sphinx_rtd_theme

In your conf.py file (C:\readthedocs\whatibroke\conf.py):
import sphinx_rtd_theme
html_theme = "sphinx_rtd_theme"
html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]

Building your output:
c:\readthedocs\Scripts>activate.bat
(readthedocs) c:\readthedocs\Scripts>cd c:\readthedocs\whatibroke
(readthedocs) c:\readthedocs\whatibroke>make html
Running Sphinx v1.3.5
loading pickled environment... done
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 0 source files that are out of date
updating environment: 0 added, 0 changed, 0 removed
looking for now-outdated files... none found
no targets are out of date.
build succeeded.

Build finished. The HTML pages are in _build/html.

Thanks to the following stackoverflow post for a lot of the information here: http://stackoverflow.com/a/19892345/522859

Unable to Access RDS Database from Elastic Beanstalk Application

Hey everyone,

I ran into a bit of an issue today where I was unable to access my RDS SQL Express instance from my .NET Elastic Beanstalk instance. I was receiving the following error:

1
The server was not found or was not accessible.

The solution turned out to be fairly simply thanks to this StackOverflow post: http://stackoverflow.com/a/33207022/522859

Get your server instance security group:
– Log into AWS
– Navigate to elastic beanstalk
– Open your application instance
– Open configuration
– Open instances
– Find “server” on the page and copy the value in the “EC2 security groups” field

Add your server instance security group to your rds rules:
– Navigate to the RDS Dashboard
– Open your RDS instance
– Click on view details (left hand side or top)
– Find Security and Network
– Click on the rds-launch-wizard under security groups
– Click on inbound rules (very bottom currently)
– Add a new inbound rule with the copied security group as the source

How to Add a FontAwesome Icon using :after

Hey everyone,

Just a quick post on how to add a fontawesome icon using :after:


.fl-cart-product-price:after{
content: '\f00d';
font-family: FontAwesome;
font-weight: normal;
font-style: normal;
margin: 0px 0px 0px 10px;
color: #555;
font-size: 85%;
text-decoration: none;
}

See this stackoverflow post for more info: http://stackoverflow.com/a/18793584/522859

Unilateral receiver not allowed in chained payment is restricted – Adaptive Payment DotNet SDK

Hey everyone,

Just an error I ran into today while using the Adaptive Payments SDK for C#/.NET:

Unilateral receiver not allowed in chained payment is restricted

Thankfully this one is fairly simple – one of the receivers hasn’t confirmed their account.

http://stackoverflow.com/a/32816078/522859

Could not find part of the path ‘C:\x\lib’ – Adding new Web API Project

Hey everyone,

I ran into the following error when I tried to add a new Web API project in Visual Studio Express 2015 for Web:

Could not find part of the path ‘C:\x\lib’

The workaround for this was to temporarily unbind the project from TFS: File > Source Control > Advanced > Change Source Control > Click unbind on each of the projects

While not the same problem, this post helped me out: https://github.com/NuGet/Home/issues/1164