----Getting flash/youtube to work well is unfortunately wishlist territory 
since they have yet to enable hw acceleration.----
I'm not sure I understand this; in Mac OSX youtube videos (both html5 and 
flash) run excellent, the problem is only in Ubuntu.

----So my Sandybridge mba can manage playing the 2k Sintel mp4 with
plenty to spare. Can you grab the 2k mp4 and the 1080p mkv versions of
Sintel and use that to baseline performance of your system? For example,
mplayer -benchmark -frames 500 -nosound $sintel----

I'm not sure if the below output is what you want?

user@pc:~$ mplayer -benchmark -frames 500 -nosound $sintel 
'/home/user/Downloads/Crossroads: Labor Pains of a New Worldview | FULL 
MOVIE.mp4'
MPlayer svn r34540 (Ubuntu), built with gcc-4.7 (C) 2000-2012 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing /home/user/Downloads/Crossroads: Labor Pains of a New Worldview | FULL 
MOVIE.mp4.
libavformat version 53.21.1 (external)
Mismatching header version 53.19.0
libavformat file format detected.
[lavf] stream 0: video (h264), -vid 0
[lavf] stream 1: audio (aac), -aid 0, -alang und
VIDEO:  [H264]  1280x720  24bpp  30.000 fps  1609.8 kbps (196.5 kbyte/s)
Clip info:
 major_brand: mp42
 minor_version: 0
 compatible_brands: isommp42
 creation_time: 2012-12-27 10:43:34
Load subtitles in /home/user/Downloads/
Failed to open VDPAU backend libvdpau_nvidia.so: cannot open shared object 
file: No such file or directory
[vdpau] Error when calling vdp_device_create_x11: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
libavcodec version 53.35.0 (external)
Mismatching header version 53.32.2
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
Audio: no sound
Starting playback...
Unsupported PixelFormat 61
Unsupported PixelFormat 53
Unsupported PixelFormat 81
Movie-Aspect is undefined - no prescaling applied.
VO: [xv] 1280x720 => 1280x720 Planar YV12 
V:  16.6   0/  0 11%  0%  0.0% 0 0 


BENCHMARKs: VC:   1.845s VO:   0.154s A:   0.000s Sys:   0.042s =    2.041s
BENCHMARK%: VC: 90.3944% VO:  7.5713% A:  0.0000% Sys:  2.0342% = 100.0000%

Exiting... (End of file)

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1103236

Title:
  Choppy and pixelated video on Macbook Air 5,1. Unable to run/view HD
  videos at all

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1103236/+subscriptions

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