Script Summary: YouTube Center contains all kind of different useful functions which makes your visit on YouTube much more entertaining.
Description
YouTube Center comes with many features, including the ability to download videos, repeat videos, change the default quality of the video to be played by default and etc.YouTube Center is designed to look as much like YouTube's design as possible.
If you want YouTube Center to be in your language and are able to translate it from a language YouTube Center supports to your language, please contact me and I will give you the information needed for you to translate it.
If you like YouTube Center, please consider supporting me by donating: 
- HTML5 Support
- Move the buttons on the YouTube video page.
- Download the video in different formats and qualities
- Repeat the video
- Change language
- Remove advertisements
- Prevent auto play/buffering.
- Choose your prefered quality to be played by default
- Auto hide controlbar and/or progressbar.
- Enable/Disable Annotations
- Scroll to player
- Change default volume
- Mute as default
- Always repeat video
- Player shortcuts outside the player
- Turn Light On/Off
You're always welcome to give me suggestion, critic and compliments.
If you only want the download button, download YouTube Center Download Button.
If you find anything you think can be done better please let me know and I will take it into consideration. If you also find any bugs or have any new ideas please let me know.
Translations
Thanks to the awesome people who are translating the script to different languages, I really appreciate it.
Languages Translated (Credits):
Arabic (Bahrain) - alihill381
Danish - Jeppe Rune Mortensen (YePpHa)
French - Loïc B (ThePoivron)
German - Simon Artmann & Sven "Hidden" W
Hebrew (Israel) - baryoni
Italian - Pietro De Nicolao
Russian - KDASOFT
Spanish - Roxz
Turkish - Ismail Aksu
Hungarian - Eugenox and Mateus
Portuguese - Rafael Damasceno
Portuguese (Brazil) - Thiago R. M. Pereira
Simplified Chinese - 小酷 and MatrixGT
Romanian - BlueMe
Polish - Piotr
Slovak - ja1som
Traditional Chinese - 泰熊
Ukrainian - SPIDER-T1 and pavliuk.petro
Japanese - Lightning-Natto
Swedish - Christian Eriksson
Guides
Full name popup fixHow to install YouTube Center in Google Chrome
How to revert back to the old YouTube video interface (and back to the new YouTube video interface) [Outdated]
Screenshots




Changelog
02-04-2013/v1.31.4:- Revamped the player resize system.
- Set the small resize button to a custom size.
- Set the large resize button to a custom size.
- Create custom player sizes.
- If width and height are empty it will result in either small size or large size.
- If only width is empty it will be automatically calculated with a 16:9 ratio from height.
- If only height is empty it will be automatically calculated with a 16:9 ratio from width.
- The align option is to set the player aligned to the description, comment and etc. If it's off it will just center the player depending on the Center Player option under the Player tab.
- The large option will move the video list under the player if enabled.
- Fixed bug caused by Chrome v27 dev.
- Fixed Player centering.
- Fixed embed videos and featured channel videos.
- Fixed Prevent (Playlist) Automatic Play/Buffer.
- Added Rafael Damasceno to the credits for the Portuguese translation.
- Improved Page Centering Speed
- Fixed bug caused by YouTube update.
- Added Japanese.
- Updated Germany.
- Other fixes.
- Update language database.
- Added Slovak translation thanks to ja1som.
- Added Traditional Chinese translation thanks to 泰熊.
- When "Hide Guide When Resizing" is disabled, it will move the guide below the player (not: small, large and content).
- Fixed layout issue (buttons, guide, center).
- Update language database.
- Added option to automatically turn lights off.
- Added option to always hide the guide.
- Added option to remove branding banner, background and watermark.
- Changed the settings panel design to better fit the new YouTube layout.
- Fixed embed videos.
- Fixed featured videos on channels (Except for HTML5).
- Fixed playlist being misplaced.
- Fixed the "Center Page".
- Fixed the auto updater (The new YouTube layout broke it).
- More fixes...
- Update language database.
- Added Polish thanks to Piotr.
- Fixed bug in download menu.
- [New YouTube Interface] Fixed black borders for buttons.
- [New YouTube Interface] Added the option to center the layout in Settings->General.
- [DEV] Added classnames to the different formats in the download menu (ytcenter-downloadmenu-{FORMAT}).
- Few other bugs I can't remember.
- Update language database.
- [New YouTube Interface] Fixed graphical bug for the repeat button.
- [New YouTube Interface] Fixed resize bug when you resize to large or small.
- [New YouTube Interface] Fixed settings not appearing sometimes.
- [New YouTube Interface] Fixed the left-side panel not being shown correctly.
- [New YouTube Interface] Fixed playlist list automatically disabling and enabling when going to and from the player size: small.
- Fixed other bugs.
- Update language database.
- Added option to be able to choose between having the player centered or not (not available for Small, Large and Fill) for those with the new interface. Default is to have the player centered.
- More fixes to the new interface (resize should now work correctly).
- Optimized the listener implemention.
- Update language database.
- Added option to hide the repeat icon (Settings->Repeat->Show Icon).
- Made the resize function compatible with the new YouTube interface.
- Made the "turn lights off" function compatible with the new YouTube interface.
- Fixed the dropdown menu (Aspect, Resize and Download).
- Fixed the player update function (annotations, player color, player theme and etc. should now work).
- Added Romanian language thanks to BlueMe.
- Updated language database.
- Added option to change the default player size in settings.
- Settings button UI fix for Firefox when logged in without YouTube using the Google+ account.
- Should work partial with the new YouTube layout.
- Fixed bugs (Should now work with old versions of Firefox with Greasemonkey again).
- Updated language database.
- Fixed settings button UI for Firefox when logged in.
- Fixed YouTube player bug.
- Fixed "Auto Detection" of languages.
- Added Simplified Chinese thanks to 小酷 and MatrixGT.
- Updated language database.
- Settings button UI fix (Was a little uneven with the other elements).
- Fixed HTML5 player bug.
- Enhanced the "Auto Detection" of languages. It should now be more efficient.
- Small bug fixes.
- Updated language database.
- Added more useful console information to the debug log (Settings->Debug).
- Bug fixes.
- Updated language database.
- Added new option in Download: Change downloads to links.
- Added two new buttons: resize and aspect.
- Moved Video tab into Player and Channel.
- Separated settings for channel and watch player settings.
- Cleaned debug log (removed useless information).
- Major bug fixes.
- Should now work with Firefox Nightly again.
- YouTube Center embed videos autoplay bug fix.
- Fixed a bug which most modern and up to date just ignored. Should now work in Google Chrome with Tampermonkey and other old browsers.
- Fixed a major bug which caused YouTube Center not to work properly (YouTube updated something).
- Added Hungarian translation by Eugenox
- Added Portuguese (Brazil) translation by Thiago R. M. Pereira
- Added more MP3 Services (YouTubeInAudio.com, HDDownloader.com and YoutubeMP3pro.com)
- Channel videos now have these working (will properly seperate channel videos and videos settings in the future):
- Auto resolution
- Remove advertisements
- Enable annotations
- Auto hide bar
- (Prevent auto buffer)
- (Prevent auto play)
- Player Theme
- Player Color
- Keyboard shortcuts in document
- Volume Control
- Auto mute
- Updated language database (Added Turkish)
- Fixed enable annotations.
- Updated language database.
- Added filename tags: format, quality, type.
- Added experimental flash mode: NRAB and Refresh HTML.
- Fixed bug with filename not being present for some users on some videos (mostly Firefox users).
- Fixed bug with double audio with experimental flash mode: Clone (This was properly caused by a memory leak in the browser but got it fixed).
- Fixed save settings for some users.
- Fixed a few other bugs.
- Fixed an issue with Maxthon 3 not saving your settings.
- YouTube Center should now semi-work with the new YouTube video interface (some of YouTube Center's features doesn't work, like the download button, repeat button and turn off light button).
- Fixed issue with saving settings in Firefox.
- Fixed issue with Tampermonkey.
- Fixed some other bugs.
- Updated language database.
- Switched to strict javascript and hopefully this will help preventing bugs for some people.
- Fixed some bugs.
- Excluded YouTube Center from http://apiblog.youtube.com/.
- Added translators in the about tab in settings.
- Added placement system (still in beta. Still some style issues).
- Added Player Color, which enables you to choose between the white or red progressbar.
- Added Display in Experiment Flash Mode. This uses another method to apply changes from YouTube Center to the YouTube player.
- Added support for the new homepage for YouTube.
- Fixed some bugs and should now be functional on the following browsers: Google chrome, Firefox, Maxthon 3, Safari and Opera. On some the update function doesn't work.
- Updated language database.
- Added Settings Reset Button
- Update language database
- Fixed some minor bugs
- Added German
- Added update tab in settings (as in the old version)
- Enable Update Checker
- Update Interval
- Check For New Updates button
- Added 3GP to filetype database (found in http://www.youtube.com/watch?v=Fr75PxkFOq4)
- Made Volume Control at Settings->Volume to be optional, can toggles here: Settings->Enable Volume Control.
- Added detection of non downloadable formats in download menu (example: http://www.youtube.com/watch?v=8wxOVn99FTE).
- Fixed some minor bugs (should not be noticeable)



