[Galaxy S III Themes and Apps  (US Carriers)] sabreful:
Confirmed working on T999, and i747

Unfortunately as some of you may have already figured out, changing your boot animation isn't as easy as it used to be.

I've searched around and couldn't actually find a decent tutorial on how to change them for rooted/stock Samsung devices.

Therefore after moderate amount of trial and error, and the much needed help of a few others, I've decided to create a small "How To" for Samsung devices.

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So the basic bootanimation editing

Get the bootanimation.zip file that you want to use (or create your own)

Unzip it to verify a little information is correct

Open the desc.txt file > you should see something like this (numbers will vary)

700 1116 18

p 1 0 part0

p 5 0 part1

Whatever bootanimation you use, make SURE that the number directly after the "p" is NOT 0 otherwise you will enter a never-ending loop.

You will probably also need to edit the dimensions in this file. (in the example would be the top line 700 1116 18)

From playing around with a few animations, somewhere in the ballpark of 480x800 and 720x1200 seem to be working pretty well, but pending the images you may need to play around with them to make it work for your phone.

Once you've set the loop amount and fixed the dimensions, save the desc.txt file, re-zip the file (make sure to include part0 and part1 and other folders if you're creating your own) and transfer it to your phone

[alternatively, adb push to system/media]

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*********** MAKE A NANDOID BACKUP ***********

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First:

Navigate to system/media and either can either A) Delete the original bootanimation.zip located in system/media or B) simply rename it to something else (ex. bootanimationBAK.zip)

Using a root explorer of some type, move the new bootanimation.zip file in this folder to replace the original. [mount r/w]

And then...

Using the root explorer, navigate to system/bin

you will be working with 2 files.

*First find a file named "samsungani" (no file extension) and delete or rename it (ex samsunganiBAK) [mount r/w]

*Secondly find a file named "bootanimation" (also, no file extension) and rename this file to "samsungani" without the quotation.

OPTIONAL...

I personally hate T-Mobile's bootup/shutdown sounds.

While we're in the /system folder we can disable or remove them completely.

*** Navigate to system/media/audio/ui

You will be working with two files here again.

Look for "PowerOff.wav" and "PowerOn.ogg"

*** Rename them to something else or simply delete them. (ex. "PowerOffBAK.wav" and "PowerOnBAK.ogg"

And finally...

Change your system to R/O and reboot your device.

NOTE: if your bootanimation winds up not playing, and you get a blank screen until the device boots up completely, verify that the images in part0 and part1 are in .png format.

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This is the reason I had to figure this out. For those of you wanting the Nexus 7 bootanimation, I have this working on my phone at the moment.

So far, this is only confirmed working on the T-Mobile GSIII however *should* work for all variants.

please let me know what other Samsung devices this also works for.

Confirmed NOT working for: I9300, L710, i535. - if you figure out a way to get this on your device, let me know and i will add it!

*** If you get this loop and are unable to navigate to folders, attached is a flashable zip for a samsung bootanimation hopefully it helps*** < thanks to billard412 for this