[reaven]

Since there are a few threads scatter around about this I will post the neccesary tools to convert and compress fanart for easy browse and flow in Apple TV here, like batches and scripts to make it work depends of the OS.

Nvidia Texture Tool 2 for Windows
Nvidia Texture Tool 2 for MAC/Linux

Windows
Windows batch download
batch features: detect and convert tbns->jpgs, detect if dds exist in folder so wont overwrite and ask for the deletion of the jpgs when finish.
First
Add this line to your AdvancedSettings.xml so XBMC could use .dds images instead of tbn.

Code:

<useddsfanart>true</useddsfanart>

Second
Edit the path to your Nvidia texture tools in the batch since I have a x64 system mine "Program Files" folder is named "Program Files(x86)" you may need to delete the "(x86)" part from the path. this is the line to edit just the path

Code:

for %%f in (*.jpg) do "C:\Program Files (x86)\NVIDIA Corporation\NVIDIA Texture Tools 2\bin\nvcompress.exe" -fast -bc1 %%f

Third
copy over the fanart from "userdata/Thumbnails/Video/Fanart" to your desktop for example and run the batch, the batch need to be in the same place as the images you just copy over. when finish copy the newly created dds files back to "userdata/Thumbnails/Video/Fanart". thats it.

MAC
Mac OS script
*Thanks to DV3B, if you optimized or change the script let me know.
The same instructions apply with a bit of changes accordingly to the OS like the path in the script.

Linux
If someone have a batch or script please post it.



More Reading
http://forum.xbmc.org/showthread.php?tid=69222
http://forum.xbmc.org/showthread.php?tid=59115

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Note that as of r28714, XBMC will create .dds versions (indiscriminately) of .tbn files at viewing time if you use the <useddsfanart> advancedsetting.