On Fri, 22 Aug 2025, Timo Rothenpieler via ffmpeg-devel wrote:
For arm I'm not sure if we really need qemu? All it might take is a
32bit arm chroot on aarch64? Not sure if it works like x86 though, where
a 64bit CPU can also run 32bit code.
It works pretty much like x86, yes - you don't need QEMU, you can run it
natively on an aarch64 kernel.
And you don't need a separate chroot - on Debian/Ubuntu multiarch it's
quite straightforward to install 32 bit arm as a separate architecture:
dpkg --add-architecture armhf
apt-get update && apt-get install g++-arm-linux-gnueabihf libc6:armhf
libstdc++6:armhf
This is enough for being able to build things for it, with
--cross-prefix=arm-linux-gnueabihf- and to run the binaries normally.
That said, the very latest generations of aarch64 chips have removed
support for executing in 32 bit mode; luckily the recent github aarch64
runners (which are quite cutting edge otherwise, and have features like
SVE2) still do support 32 bit. But e.g. on Amazon, the Graviton 4 series
no longer supports 32 bit, and the Apple M1 (and newer ones) also lack 32
bit support entirely.
// Martin
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