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Render thumbnail images of video uploaded at custom path using CarrierWave gem

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Environment : Ruby 1.9.3 / Rails 3.2.1 / Ubuntu 11.10

I am using CarrierWave gem in my application to upload video files. Below is my custom Uploader.

video_file_uploader.rb (uploader)

video.rb (model)

As can be seen above the store_dir points to a path

The directory structure for I have is as follows:

Now I am generating a thumb for the uploaded video at

I need to render this thumb image in my view.For this I used

but it is not getting rendered. In Firebug I can see that the image gets loaded, when I specify the file system's absolute path to the file, while on UI only the thumb image name (alt attribute value) is displayed.

How can I render the images available in a custom directory, like uploads, as shown in the scenario above?

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