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Currently, enable_v4l2_probe is hard-coded to "yes" on linux, platforms arm and aarch64. This even overrides the --disable-v4l2-probe argument. As a result, it is impossible to disable v4l2_probe. It becomes a problem for use-cases, when startup time is critical, because the v4l2_probe feature increases the initialization time. This commit makes the v4l2_probe feature configurable. On linux, platforms arm and aarch64, the default value is still "yes". But now it can be disabled by the --disable-v4l2-probe argument. https://bugzilla.gnome.org/show_bug.cgi?id=795200
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