If you've redirected things you should be getting the STDERR output as well. 

$ 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
|

[download]

My suspicion is that the output may be explicitly going to the tty instead of STDERR so redirection this way isn't going to affect it.

Update: Well nope, that's not it. Seems to capture things fine for me (OS X, perl 5.18.2, homebrew'd ffmpeg 4.2.1). 

$ 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
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/Users/fletch/lib/homebrew/Cellar/ffmpeg/4.2
+.1_2 --enable-shared --enable-pthreads --enable-version3 --enable-avr
+esample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines
+/jdk1.8.0_221.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMa
+chines/jdk1.8.0_221.jdk/Contents/Home/include/darwin' --host-ldflags=
+ --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enabl
+e-libbluray --enable-libmp3lame --enable-libopus --enable-librubberba
+nd --enable-libsnappy --enable-libtesseract --enable-libtheora --enab
+le-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --e
+nable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig -
+-enable-libfreetype --enable-frei0r --enable-libass --enable-libopenc
+ore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-li
+brtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disa
+ble-libjack --disable-indev=jack
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, s16le, from '/dev/null':
  Duration: N/A, bitrate: 705 kb/s
    Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
At least one output file must be specified
|

[download]

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re: qx and STDERR? by Fletch
in thread qx and STDERR? by morgon

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