2016-01-08 10:17 GMT+01:00 Eli Zaretskii <eliz@gnu.org>:

> > From: Klaus-Dieter Bauer <bauer.klaus.dieter@gmail.com>
> > Date: Fri, 8 Jan 2016 00:31:38 +0100
> > Cc: emacs-devel@gnu.org
> >
> > - I want at some point to write an incremental backup utility
> > that uses md5sum to identify renamed files. Since precompiled
> > Windows binaries are 32bit, only the first 512MB of any given
> > file are accessible to elisp however, so I wanted to use
> > GnuWin32's md5sum.exe (but it turns out that it doesn't
> > support unicode filenames anyway).
>
> Emacs 25 can be built --with-wide-int, in which case the 512MB limit
> goes up to almost 2GB.  I believe the precomiled binaries of the next
> version will use this configure-time option.  So maybe this is still a
> relevant alternative for you.
>
> > - I want to verify a convention where filenames should mirror
> > the metadata in my music library. Here I intended to write
> > an elisp tool (for easy interactive processing im Emacs)
> > and tried to use ffmpeg (which does support unicode filenames
> > in cmd.exe).
>
> You could have Emacs write a batch file that invokes ffmpeg with those
> Unicode file names (encoded in UTF-16, of course, not UTF-8!), and
> then run the batch file as the sub-process.  Will that work for you?
>

​It will, though I'll probably stick with the pipe version
where it's possible. It is the more portable solution (in
case that I use the script on a linux system).
​


>
> > I checked and both tools allow reading the input data from
> > a pipe (`type UNICODE.mp3 | ffmpeg -i - ...` or `md5sum`
> > respectively), so that workaround is applicable to all my usecases.
>
> Yes, that's another possibility.
>