Hi everyone,
I have got a problem with youtube videos - they are very choppy. Strange is, that this problem appears only on youtube.com. When I want to watch youtube video anywhere else (e.g. on Facebook). everything runs smoothly.

[michal@arch-linux: ~]$ firefox
OpenOffice path before fixup is '/usr/lib/openoffice.org3'
OpenOffice path is '/usr/lib/openoffice.org3'
Failed to open VDPAU backend libvdpau_nvidia.so: cannot open shared object file: No such file or directory

That's what I see when I enter any YouTube video.

System informations are below:

[michal@arch-linux: ~]$ uname -a
Linux arch-linux 2.6.37-ARCH #1 SMP PREEMPT Fri Feb 25 09:07:57 UTC 2011 i686 Intel(R) Pentium(R) D CPU 3.00GHz GenuineIntel GNU/Linux

[michal@arch-linux: ~]$ lspci |grep VGA
00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)

[michal@arch-linux: ~]$ firefox --version
Mozilla Firefox 3.6.15, Copyright (c) 1998 - 2011 mozilla.org
flashplugin 10.2.152.27-2

[michal@arch-linux: ~]$ pacman -Q intel-dri
intel-dri 7.10.1-1

[michal@arch-linux: ~]$ pacman -Q mesa
mesa 7.10.1-1

Videos ran previously fine. They are broken after upgrading Firefox to version 3.6.15, thought. Or maybe after last system upgrade, here is the list of upgraded packages in last two days.

[2011-03-03 15:55] upgraded exiv2 (0.20-1 -> 0.21.1-1)
[2011-03-03 15:55] upgraded file (5.05-1 -> 5.05-2)
[2011-03-03 15:55] upgraded libgl (7.10.0.git20110215-1 -> 7.10.1-1)
[2011-03-03 15:55] upgraded intel-dri (7.10.0.git20110215-1 -> 7.10.1-1)
[2011-03-03 15:55] upgraded mkinitcpio (0.6.8-1 -> 0.6.8-2)
[2011-03-03 15:57] upgraded kernel26 (2.6.37.1-1 -> 2.6.37.2-1)
[2011-03-03 15:57] upgraded libgexiv2 (0.2.2-1 -> 0.3.0-1)
[2011-03-03 15:57] upgraded mesa (7.10.0.git20110215-1 -> 7.10.1-1)
[2011-03-03 15:57] upgraded xfce4-panel (4.8.1-1 -> 4.8.2-1)
[2011-03-03 15:57] upgraded orage (4.8.0-1 -> 4.8.1-1)
[2011-03-03 15:57] upgraded ppl (0.11-1 -> 0.11.2-1)
[2011-03-03 15:57] upgraded qt (4.7.1-3 -> 4.7.2-1)
[2011-03-03 15:57] upgraded shotwell (0.8.1-2 -> 0.8.1-3)
[2011-03-03 15:57] upgraded xvidcore (1.2.2-1 -> 1.3.0-1)
[2011-03-04 15:03] upgraded shadow (4.1.4.2-4 -> 4.1.4.3-1)
[2011-03-05 14:39] upgraded dhcpcd (5.2.10-1 -> 5.2.11-1)
[2011-03-05 14:39] upgraded libmpc (0.8.2-3 -> 0.9-1)
[2011-03-05 14:39] upgraded mplayer (32792-2 -> 32792-3)
[2011-03-05 14:39] upgraded ncurses (5.7-4 -> 5.8-1)
[2011-03-05 14:39] upgraded sudo (1.7.4.p6-1 -> 1.8.0-2)

Have you got any idea how to solve this problem? It also appears in Chromius as well as in Opera. In both browsers outputs are exactly the same.)

Thanks for any advice.

I wonder if your ISP is limiting bandwidth to youtube.com. It seems odd
that other videos are good, but not ones from a single site.

The issue should be fixed by right clicking on a youtube video --> settings. Then uncheck the "Enable hardware acceleration" box. This seems to be an issue with youtube only and has been experienced by a lot of users in the arch community lately. Let me know if this resolves your issue (it did for me).

MichalKvacek - as an aside, make sure you also visit the arch forums regularly. Or at least search the forums when you come across an issue. This has been covered in a number of threads over past few days by people experiencing the same problem

I know, that somebody should been experienced with this issue. I saw threads only about falling down Firefox when entered on YouTube etc. Unfortunately, I have not found any thread which could solve this issue. That's why I am asking here.

And about Settings. I can't try it, because the item Settings is disabled (it's gray and non-clickable). I think the problem is something with libvdpau_nvidia.so, because when this appears (that this shared libraly is not available), the video is choppy and unwatchable.
Strange is, that I have no nVidia card. I have tried to copy this libraly from nvidia-utils, but it doesn't help. There was some problem with GLX thought (I'm not sure, but it doesn't solved it.)

It was disabled for me as well; try on hulu.com video. For me I was unable to uncheck the box when watching the video regular size. A user on arch irc channel found that if you make the video fullscreen, you are able to uncheck the "Enable hardware acceleration" box.

1 members found this post helpful.

Thank you, Novartum. Visiting hulu.com (even if I'm not from USA, so I could not be able to watch any video) and unchecking "Enable hardware acceleration" helped.

Thanks a lot .

sudo gedit /etc/apt/apt.conf.d/70debconf.

Then put this code,:
APT::Cache-Limit "100000000";
on that file and then save it.

Next type this code on your terminal
sudo apt-get clean && sudo apt-get update --fix-missing
and you won’t find apt cache limit again in the next time.

It worked for me!!!

I copied this from another forum and it absolutely ended my struggles with this problem. Up to trying this I had tried EVERYTHING else. Hope some of you see and try this before going through all the crap I went through.

Good luck!