FFmpeg VAAPI

env PULSE_LATENCY_MSEC=20 LD_LIBRARY_PATH=/home/usuario/ffmpeg_linux/lib /home/usuario/ffmpeg_linux/bin/ffmpeg     -vaapi_device /dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -thread_queue_size 2048 -f pulse -channels 2 -i alsa_output.pci-0000_00_1f.3.analog-stereo.monitor      -r 30 -thread_queue_size 2048 -f x11grab -probesize 12M -s 1280x720 -i :0.0+56,26   -acodec libopus  -application lowdelay      -vf  format=nv12,hwupload  -vcodec vp8_vaapi     -threads 4 -r 30  -f webm -flags +global_header  video000.webm
ffmpeg version N-91268-g8a0c2901f1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/home/usuario/ffmpeg_linux --enable-gpl --enable-libfontconfig --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxcb-shape --enable-libpulse --enable-vaapi --enable-libfreetype --enable-libfdk_aac --enable-libopus --enable-libvorbis --enable-libx264 --enable-libvpx --enable-nonfree --disable-doc --disable-ffprobe --disable-ffplay
  libavutil      56. 18.102 / 56. 18.102
  libavcodec     58. 20.101 / 58. 20.101
  libavformat    58. 17.100 / 58. 17.100
  libavdevice    58.  4.100 / 58.  4.100
  libavfilter     7. 25.100 /  7. 25.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, pulse, from 'alsa_output.pci-0000_00_1f.3.analog-stereo.monitor':
  Duration: N/A, start: 1528861393.463817, bitrate: 1536 kb/s
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Input #1, x11grab, from ':0.0+56,26':
  Duration: N/A, start: 1528861393.544215, bitrate: N/A
    Stream #1:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1280x720, 30 fps, 29.92 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #1:0 -> #0:0 (rawvideo (native) -> vp8 (vp8_vaapi))
  Stream #0:0 -> #0:1 (pcm_s16le (native) -> opus (libopus))
Press [q] to stop, [?] for help
[libopus @ 0x55ad630f04c0] No bit rate set. Defaulting to 96000 bps.
Output #0, webm, to 'video000.webm':
  Metadata:
    encoder         : Lavf58.17.100
    Stream #0:0: Video: vp8 (vp8_vaapi), vaapi_vld(progressive), 1280x720, q=2-31, 30 fps, 1k tbn, 30 tbc
    Metadata:
      encoder         : Lavc58.20.101 vp8_vaapi
    Stream #0:1: Audio: opus (libopus), 48000 Hz, stereo, s16, 96 kb/s
    Metadata:
      encoder         : Lavc58.20.101 libopus
frame= 6417 fps= 30 q=-0.0 Lsize=   30558kB time=00:03:33.91 bitrate=1170.2kbits/s speed=   1x
video:27649kB audio:2788kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.393712%