Ubuntu 14.04 freezes when watching youtube videos

Question

When I watch videos on YouTube, the computer starts freezing. Sometimes it unfreezes after 10 seconds or so, but sometimes it doesn't. It happens both in Firefox and Chromium, although in Chromium it's not as bad.

I searched through this question and none of the solutions I read about worked for me. Freezing still happens.

How do I solve it?

EDIT: Here's an output of lspci

variecs@variecs-N550JV:~$ lspci -k | grep -EA2 'VGA|3D'
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
    Subsystem: ASUSTeK Computer Inc. Device 11cd
    Kernel driver in use: i915
--
01:00.0 3D controller: NVIDIA Corporation GK107M [GeForce GT 750M] (rev a1)
    Subsystem: ASUSTeK Computer Inc. Device 11cd
    Kernel driver in use: nouveau

EDIT 2: turns out it was a NVIDIA driver issue, reinstalling it helped fix it.

Solution

You need to install a driver for your Nvidia adapter.

Run in terminal

sudo apt-get install nvidia-352 nvidia-prime

and reboot.

Comments

[Mostafa Ahangarha]

In what kind of situation it happens? For me, it happens sometimes when I try to exit fullscreen mode.

[Variecs]

it happens even if i watch it in windowed mode, and is in no way related to switching between fullscreen and windowed mode. It just happens periodically by itself.

[Olathe]

What happens when you turn off hardware acceleration at the bottom of Chromium's advanced settings? Does that fix the problem?

[Variecs]

No, turning off hardware acceleration doesn't fix the problem

[Pilot6]

Please edit your question and add output of lspci -k | grep -EA2 'VGA|3D' terminal command.

[Variecs]

added lspci output

[Pilot6]

See my answer. A driver is required.

[Variecs]

It seems like i already play it on HTML5. It has "About HTML5" item

[Fiksdal]

Also, what if OP needs flash? Many sites still use it.

[Olathe]

It should be added as well that Chrome (not Chromium) on Linux includes the latest Flash player, updated the same as the Windows version (version 21 now versus Linux's 11).