Command to exec
[ '-i',
  'rtmp://........',
  '-vf',
  'scale=1280:720',
  '-vb',
  '2500k',
  '-g',
  90,
  '-framerate',
  30,
  '-hls_time',
  3,
  '-f',
  'hls',
  '.720p-h.m3u8',
  '-vf',
  'scale=852:480',
  '-vb',
  '625k',
  '-g',
  90,
  '-framerate',
  30,
  '-hls_time',
  3,
  '-f',
  'hls',
  'id.m3u8',
  '-vf',
 '-vf',                                                                                                                      [167/1884]
  'scale=1280:720',
  '-vb',
  '2100k',
  '-g',
  90,
  '-framerate',
  30,
  '-hls_time',
  3,
  '-f',
  'hls',
  'i.m3u8',
  '-vf',
  'scale=1280:720',
  '-vb',
  '1700k',
  '-g',
  90,
  '-framerate',
  30,
  '-hls_time',
  3,
  '-f',
  'hls',
  'w.m3u8' ]
stderr: ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/in
clude/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-l
ibass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetyp
e --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --
enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-
libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enab
e-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264
--enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100

stderr: Input #0, flv, from '....
  Metadata:
    Server          : NGINX RTMP
    displayWidth    : 1280
    displayHeight   : 720
    fps             : 30
    profile         :
    level           :
  Duration: 00:00:00.00, start: 2.182000, bitrate: N/A
    Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 131 kb/s
    Stream #0:1: Video: h264 (Constrained Baseline), yuv420p(tv, bt709, progressive), 1280x720, 2097 kb/s, 30 fps, 30 tbr, 1k tbn, 60 tb
c

stderr: Stream mapping:
  Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (aac (native) -> aac (native))
  Stream #0:1 -> #1:0 (h264 (native) -> h264 (libx264))
  Stream #0:0 -> #1:1 (aac (native) -> aac (native))
  Stream #0:1 -> #2:0 (h264 (native) -> h264 (libx264))
  Stream #0:0 -> #2:1 (aac (native) -> aac (native))
  Stream #0:1 -> #3:0 (h264 (native) -> h264 (libx264))
  Stream #0:0 -> #3:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help

stderr: [libx264 @ 0x55854dac0960] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512

stderr: [libx264 @ 0x55854dac0960] profile High, level 3.1

stderr: [libx264 @ 0x55854dac0960] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/
x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_
me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decim
ate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2
keyint=90 keyint_min=9 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=2500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69
qpstep=4 ip_ratio=1.40 aq=1:1.00