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What is `libsane-v4l.so.1` and how do I get it?

tag-icon • tag-icon printer scanner sane
What is `libsane-v4l.so.1` and how do I get it?

スキャナの問題を解決しようとしています（Brother DCP-110c スキャナーが Mint 18.1 で動作しない、そしてそれに続くこの郵便受け使用すると書いてある

export SANE_DEBUG_DLL=128
scanimage -L

in order to look for errors of the form No such file or directory and copy the specified file at the specified location, I only got these errors:

[dll] load: trying to load `/usr/lib/x86_64-linux-gnu/sane/libsane-v4l.so.1'
[dll] load: couldn't open `/usr/lib/x86_64-linux-gnu/sane/libsane-v4l.so.1' (No such file or directory)
[dll] load: trying to load `/usr/lib/sane/libsane-v4l.so.1'
[dll] load: couldn't open `/usr/lib/sane/libsane-v4l.so.1' (No such file or directory)
[dll] load: couldn't find backend `v4l' (No such file or directory)

But these files seem absent (tested with locate)...

答え1

Those errors simply mean that scanimage tried to load the v4l backend, but failed. That’s not particularly surprising, because the v4l backend isn’t well supported nowadays (if at all) — it was designed for the old V4L kernel API, and as far as I’m aware hasn’t been updated to the current API (V4L2). On Debian derivatives (including Mint), it’s disabled.

In any case, none of that matters for your scanner: the V4L backend allows video input devices such as webcams to be used as scanners. It’s irrelevant for your printer.

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