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I'm invoking ffmpeg with subprocess.Popen , and trying to capture the stderr output and write it to logging . args = ['ffmpeg', '-i', path] if start: args += ['-ss', start] if end: args += ['-t', end] args += [ '-vcodec', 'copy', '-acodec', 'copy', '-scodec', 'copy', '-f', 'mpegts', '-y', '/dev/stdout'] self.child = subprocess.Popen( args, stdin=open(os.devnull, 'rb'), stdout=subprocess.PIPE, stderr=subprocess.PIPE) ffmpeg generates a lot of configuration information like the following: FFmpeg version 0.6.2-4:0.6.2-1ubuntu1, Copyright (c) 2000-2010 the Libav developers built on Mar 22 2011 15:55:04 with gcc 4.5.2 configuration: --extra-version=4:0.6.2-1ubuntu1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static WARNING: library configuration mismatch libavutil configuration: --extra-version=4:0.6.2-1ubuntu2 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libdirac --enable-libgsm --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping

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