YouTube doesn't work in Safari. If YouTube and Flash videos do not play on Mac OS X
Despite the closed nature of the Mac OS environment, which is hinted at to the inexperienced user and Mac App Store, and iTunes (a treasure trove of media content), YouTube rules the world of multimedia, and YouTube was, is and will be available to all Internet users, regardless of operating system, installed on the computer, because the “YouTube businessman” needs viewers.
Method No. 1
Method No. 2
YouTube includes clips, video podcasts, live broadcasts, video clips, and even films. Therefore, the desire to download from YouTube is completely logical, but contrary to the mac ecosystem, since the habit of paying for content in the USA has been developed and tempered over the years, both by the Internet environment and at the legislative level. But as long as there is demand, there will always be supply.
Having looked through the pages of the App Store, you are unlikely to find a program for downloading from YouTube, except for programs that will help you view YouTube pages in an interface more familiar to Mac users with beautiful effects, smooth transitions and powerful search. You will not be able to view content offline. You can check this yourself by typing in the search. Apps Store something like “youtube download”. The only application for this request is Tuba for Youtube; perhaps, when you read this article, some other application will appear, but the likelihood that someday you will be able to simply download from YouTube is extremely low.
So, how to download from YouTube to a computer under Mac control OS?! It's quite simple, first check the name of the browser you are using, it is most likely one from this list: Chrome or Safari. If you already know which one is yours, then proceed to view the instructions below; each browser has a separate description in this article.
If you accidentally stumbled upon this article while looking for a solution for Windows, then this is the place for you.
Download from YouTube with Safari browser
1. Download the Safari browser add-on.
2. The file you downloaded can be found here: 
3. Double-click on its name and click “install” in the extension installation window: 
Check the result; when watching videos on YouTube, there will be a “Download” button under the video.
Download from YouTube with Chrome browser
1. Save the extension file to any folder or desktop.
2. Click the settings icon on the browser toolbar, then select the menu “Tools” - “Extensions”, as shown in the screenshot: 
3. Drag the saved extension file “helper_last.crx” to the extensions page. 
4. Click the "Add" button.
Check the installation result by opening the video on YouTube, the “Download” button should appear.
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Black screen in YouTube player and videos not playing in Mac OS X is a common error. After searching the Internet for a solution, you can find quite a lot of troubleshooting suggestions, but many of the suggested solutions do not fix the video player error. However, after doing a small amount additional settings, you can use a workaround that offers some simple troubleshooting steps.
Problem when video doesn't work Safari browsers, Firefox or Google Chrome in Mac OS X mainly deals with a combination of settings and Adobe compatibility issues Flash Player with software that allows you to play this video. Using the following tips for troubleshooting video problems on Mac OS X, you will have video working on your Mac.
Uninstalling and reinstalling Adobe Flash Player (make sure you have latest version)
This may or may not fix flash video problems, but it's worth a try. First, go to the official Adobe website and download Flash Player Uninstaller for OS X. Run the uninstaller and simply uninstall Flash Player from your Mac and restart your computer.
Once your computer boots up and you're signed in, go to Adobe.com to download the latest version of Flash Player. Install and check if possible YouTube video already working.
Reset Safari, Firefox, Chrome and clear cache
If Flash Player is still not working properly, you can try clearing your browser cache, then exit the browser, and restart it. Some users have reported that the video starts working properly after doing this.
Running Safari, Firefox, Chrome in 32-bit mode
This is a solution that works for many people who have problems with YouTube videos in Safari. Simply open a new Finder window on your Mac and navigate to your Applications folder. There, find the Safari/Firefox/Chrome icon, and click right click mouse to bring up the context menu.
Select Get Info from the menu. After that, click on the checkbox Open in 32-bit mode.
Close the window and exit Safari/Firefox/Chrome. After the browser closes, open it again and it should be running in 32-bit mode.
Try playing a YouTube video.
Disabling hardware acceleration
While there is a black rectangle on the screen with a YouTube video that is not working correctly, right-click on the window area to call context menu Flash Player. Select the Settings option from the menu. Cancel the option Enable hardware acceleration and click the Close button.
Close the browser completely, and check how YouTube videos play after restarting.
Disable HTML 5 setting in YouTube
Depending on what your settings are account YouTube, you can customize the display of HTML 5 content. Follow the link to http://www.youtube.com/html5 to change this setting. This means that if you are not currently participating in the HTML 5 Beta program, click on the Join the HTML 5 Trial button. IN otherwise If you are participating in the HTML 5 beta program, click the Opt Out button.
Close your browser and then launch it and check if YouTube and other Flash videos are working.
By the way, if you decide to try another product from Apple and buy an iPhone 5s, the problem with YouTube and Flash videos will probably also be relevant for you.
Some Apple users, periodically encounter a problem when, when watching a video on an iPhone in Safari, YouTube and other applications, the video does not play. Because this error occurs quite often, while not being critical; the methods for solving it are simple and do not require much time.
If a video won't play on your iPhone, force restarting the app may help solve it! At first glance, the solution is simple and banal, and you, most likely, have already done this, if so, then proceed to the next step, if not, then force closing applications on the iPhone is done like this:
For iPhone X:
1. Swipe from the bottom of the screen to the middle, pausing briefly at the end.
2. In the selection window that appears, select an application or tab that does not play video on iPhone.
3. Pinch it.
4. Now either swipe the app or tap on the minus sign in the top left corner of the tab.
For iPhone 8 and below:
1. Press the “Home” button twice.
2. Once you see a preview of your open tabs, find the app where your iPhone is refusing to play videos.
3. Swipe up on the selected app.
4. Now go back to home screen and open it again by trying to play the video. If the video playback error persists, proceed to the next step.
If the iPhone does not play video in any application, restarting the iPhone is unlikely to help. But, there is a possibility that the error is an isolated case and after rebooting the device the problem will not recur. We will not explain in detail how to restart an iPhone, since virtually everyone knows this.
However, if you have been using Apple products relatively recently and have not yet fully understood the full functionality of the device, we advise you to read the article: or look at the screenshot attached below.
What should I do if the video does not open in Safari? Clear your browser cache!
As one could understand from the name, the method is focused exclusively on the Safari application, or not? Actually no, and Safari is the most common, popular example. You can clear the cache of absolutely any application and thus try to get rid of problems with video playback on iPhone.
To clear the Safari cache, do the following:
1. Open "Settings" and select the "Safari" section.
2. Select the “Clear history and website data” option. Wait for the operation to complete.
Important: After clearing the cache, all auto-login data, mainly passwords, will have to be entered again.
Setting the correct date and time
One of possible reasons an error occurs in which the video does not play on the iPhone, it may be incorrect set date and time. The chance that this is the reason is extremely small. But we do not exclude the possibility of an iOS bug and human factor interference in the operation of the operating system. To change the date and time on iPhone, do the following:
1. Go to “Settings” → “General” section.
2. Select Date and Time.
3. If the toggle switch opposite the “Automatic” function is active, turn it off and enter the time manually. If not, just turn it on and, if necessary, restart your iPhone.
We also note that if the date and time are set correctly, do not neglect this method. Despite its simplicity and primitiveness, it can be quite effective in solving some problems.
Updating broken applications
If your iPhone stops playing videos in a particular application, most likely the problem lies there. This can happen due to a long absence of updates, as a result, the refusal of certain resources to support a given version of the program, or a system failure due to malfunctions on the part of the developer.
There are two ways to update the application. Both are standard and do not require complex operations.
Updating applications using AppStore
The first way to update applications on a smartphone is with his direct participation.
1. Open "AppStore".
2. Go to the “Updates” tab and click “Update all” in the upper right corner or “Update” next to a specific application if you do not want to update everything.
Updating Apps Using iTunes
The second method is suitable if you are unable to connect to Wi-Fi or have insufficient mobile traffic. Therefore, all we need is a PC connected to the Internet, the last iTunes version, lightning cable and the iPhone itself.
1. Connect your device to your PC using a lightning cable.
2. Select the newly connected device.
3. From the sidebar, select the Apps menu.
4. Now, all that remains to be done is to select the application that needs to be updated (there is also a function that allows you to update everything) and synchronize all actions with the device.
Reinstalling the application
If all the methods described above are simple and do not entail any serious consequences, then starting from this point, the actions will not be the most pleasant. Another solution to the error where the iPhone does not play video can be to reinstall the application.
Important: It all depends on the application, but after reinstalling, there is a possibility that all settings and progress that were in the application will be reset.
To reinstall the application, do the following:
1. Go to “Settings”, section “Basic”.
2. Click on the “iPhone Storage” item (in different versions iOS names vary).
3. Now select the application in which the video does not play and delete it.
4. Then go to the AppStore and reinstall the just removed program.
Resetting network settings
Another obvious reason why the iPhone does not want to play video may be incorrect network settings. Resetting the settings will erase all data Wi-Fi networks that were previously saved.
1. Open “Settings” and go to the “General” section.
2. Select the “Reset” tab, which is located at the very bottom.
3. Now select “Reset network settings” and follow easy instructions appeared on the screen.
Software update
If none of the above methods helped and the video still does not play, the cause of the problem probably lies in the iPhone itself, and not in the applications. Enough in an effective way To combat this malfunction will be an iOS update.
Updating software using a smartphone
The first and easiest way is done using a smartphone (as is obvious from the name). All you need to implement it is a sufficient battery charge (at least 60%) and a connection to a stable Wi-Fi network.
1. Open "Settings" and go to the "General" section.
2. Select the “Software Update” tab.
3. Now click on “Download and Install”. The iPhone may also require you to remove an application if there is not enough space on the device.
4. After downloading the update, click “Install” and wait until the end of the update process.
Updating Software Using iTunes
As you already understood, the second method is carried out using a PC.
1. Make sure you have the latest version of iTunes. If so, connect your iPhone.
2. Open iTunes and select the connected gadget.
3. In the “Overview” tab, click “Update”.
Backup recovery using iTunes or iCloud
This solution is only suitable if the error where the iPhone does not play video appeared relatively recently. As the name suggests, restoration can be done in two ways.
Recovery using iTunes
Recovery mode with using iTunes, is suitable if you otherwise have a PC on which you created backup copy before there is a problem with video playback and the Lightning cable. Now, all you need to do is:
1. Connect your device to your PC using a Lightning cable and enter the device into DFU mode.
2. Select the newly connected device as soon as it appears in iTunes.
3. In the “Overview” tab, press the “Shift” key (on a mac “option”) and left-click on the “Restore [device]” function.
4. Select required file for recovery.
5. Confirm your actions by clicking “Restore” again.
6. Wait for the process to complete (the device will reboot during the process).
