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$ perl -E '$foo = qx{zsh -c "print I GO TO OUT; print I GO TO ERR 1>&2
+" 2>&1}; say qq{foo: |$foo|}'
foo: |I GO TO OUT
I GO TO ERR
|

$ perl -E '$foo = qx{ffmpeg -f s16le -i /dev/null 2>&1}; say qq{foo: |
+$foo|}'
foo: |ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg develope
+rs
...
    Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
At least one output file must be specified
|