pdftexwindows
Is the a place where I can download up-to-date win32 binaries of pdflatex (including all other files needed)?
I don't need a GUI, just the plain .exe.
MikTex-portable contains a pdflatex.exe but also a lot of other stuff i don't need and copying it to a microSD-Card takes a lot of time because the filesystem has to create a lot of (small) files.
Instead of reckless deleting stuff from the Miktex directory i would like to use pdflatex from a trustworthy source and just add the packages i need.
The problem you describe is unrelated to the media9 package, only the animate package is involved in this Asymptote script.
I tried your example with a vanilla TeXLive-2012 on my Linux box, with packages updated using tlmgr update --all, prior to running asy on your code. animate is 6/12/2012, Asymptote is 2.16.
Everything works fine, with r running from 1 to 31.
I also tried an Asymptote-2.21 installation outside TeXLive with the same (correct) result.
I was hitting exactly the same problem, and solved it by uninstalling the x64 version of MiKTeX and installing the x32 version instead. I'm now prompted to download the missing packages.
Hopefully this answer doesn't come too late!
Best Answer
A trustworthy source is CTAN. There's a
systemdirectory, and a win32 directory below that. There you can choose your executable.http://ctan.org/tex-archive/systems/win32
An obvious choice is
http://ctan.org/tex-archive/systems/win32/w32tex
where you can find pdftex-w32.tar.bz2. This is the engine (binary), then you need a LaTeX format file, and I guess you would like to have the base classes and styles too, so download latex.tar.bz2 as well.