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Visual Comparison + SVN - Printable Version

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Visual Comparison + SVN - mctubster - 01-12-2010 06:35 AM


I have hosted pagetest 1.7 installed. I check out from SVN (119?) yesterday and applied over the top.

I am trying to run the visual comparison. It completes the five tests per site OK, and gives me the rows of snapshots.

However when I click on the link to generate a video comparison, I never get anything back. (it redirects to a wait screen, where I stay).

Is there a dependency that I need to install (I have avisynth filters installed)


RE: Visual Comparison + SVN - pmeenan - 01-12-2010 07:06 AM

Sorry, to do the offline rendering of the videos requires installing some more software on the test system.

You need to install avisynth on the test machine (same one running urlblast) and you also need to put x264.exe (attached - though you'll need to unzip it) in the same directory as urlblast.

The test machines (when configured with avisynth and x264) also do the offline rendering of the videos.



x264: [attachment=34]

RE: Visual Comparison + SVN - mctubster - 01-12-2010 09:59 AM


I put the x264 file in my urlblast dir. Still not working. Maybe I need a new urlblast? I can see a zip file in the work/video dir, but it is not getting picked up (which I assume urlblast is doing as I can't see anything in the php code

FYI urlblast is

RE: Visual Comparison + SVN - pmeenan - 01-12-2010 10:19 AM

Latest build of urlblast from the tip is attached. You have avisynth on the test machine, not your desktop, right?



RE: Visual Comparison + SVN - mctubster - 01-12-2010 10:29 AM

Hi Pat,

Updating urlblast was it. It is all working 100%. Great!


RE: Visual Comparison + SVN - vvoyer - 03-03-2010 09:07 PM


i successfully installed webpagetest on a dedicated server (latest SVN)

+ i have installed a windows client (XP pro 2002 SP3, this is a "selenium" machine)

the tests run well, i got screenshots and all features

+ i've downloaded avisynth, and latest urlblast from this page (also tested versions from http://www.webpagetest.org/software/)

Then, when i try to do video testing, the only thing i get is black screens, i only got ONE screenshot each time, this is strange because without video testing screenshots are ok.

any idea ?


RE: Visual Comparison + SVN - pmeenan - 03-03-2010 09:55 PM

Is the desktop visible during testing (i.e. not locked)? That is the behavior I see when the desktop is not logged in during the testing. The video capture does screen shots directly from the video card and if the desktop isn't visible it fails. The normal screen captures (non-video) are done in a way that can work when the window isn't visible but the overhead is too high to do it that way for the video capture.


RE: Visual Comparison + SVN - vvoyer - 03-03-2010 11:28 PM

Hello, it works now, i'll explain if people have the same problem :

we use virtual machine for webpagetest so we connect with windows remote desktop.

if i'm logged but the remote desktop is minimized, video functino is broken, if i'm logged and i'm in fullscreen into the remote desktop, it does works !

Thanks, i think there's no other workaround since screenshots are took from the video card but if you have one ..