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add_anykey() installed the "press any key to stop" stdin watch unconditionally. When stdin was redirected from a non-interactive source (e.g. /dev/null) it was immediately readable / at EOF, which GLib reports as G_IO_IN, so the watch fired right away and stopped acquisition immediately. Skip the key watch when stdin is not a terminal. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Tested on Linux and working by a human (me). I cannot test on Windows, so keeping the old behavoir there.
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This allows to run this:
which removes the possiblity of accentially interrupting a capture.