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• opus_pvq : fix PVQ search for K 5 and low Ns

  19 février 2017, par Rostislav Pehlivanov

  opus_pvq : fix PVQ search for K < 5 and low Ns
  If the PVQ search picked a place to increment/decrement on the y[]
  
  vector which had no pulse then it would cause a desync since it would
  
  change the sum in the wrong direction. Fix this by not considering
  
  places without pulses as viable.
  This makes the PVQ search slightly worse at K < 5 which isn’t all that
  
  common. Still, this is a workaround to prevent making broken files until
  
  I can think of a better way of fixing it.
  Also add an assertion, which can be removed or moved to assert1/2 once
  
  the PVQ search is stable.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/opus_pvq.c

• How do I make audio work with pulseaudio in systemd ? [migrated]

  1er avril 2022, par user5827693

  I'm trying to live stream my website to the rtmp server via pulseaudio, ffmpeg and chromium in ubuntu 20.04. Everything works great if I execute the following commands in shell :

  


  pulseaudio&
ffmpeg -y -f x11grab -draw_mouse 0 -s 1280x720 -i :1.0+0,0 -f pulse -ac 2 -i default -c:v libx264 -c:a aac -b:a 128k -f flv MY_SERVER &> /dev/null < /dev/null &
DISPLAY=:1.0 chromium-browser --autoplay-policy=no-user-gesture-required --disable-gpu --user-data-dir=/tmp/test --window-position=0,0 --window-size=1280,720 --app=MY_URL &


  


  However if I try to setup the same logic via systemd - everything works fine, except there is no audio. Below are my systemd files.

  


  pulseaudio.service

  


  [Unit]
Description=PulseAudio system server

[Service]
User=ubuntu
Type=notify
ExecStart=/usr/bin/pulseaudio --daemonize=no
Restart=always

[Install]
WantedBy=multi-user.target


  


  chromium.service

  


  [Unit]
Description=start chromium browser
After=pulseaudio.service

[Service]
User=ubuntu
Type=simple
Environment=DISPLAY=:1.0
ExecStart=/usr/bin/chromium-browser --autoplay-policy=no-user-gesture-required --disable-gpu --user-data-dir=/tmp/test --window-position=0,0 --window-size=1280,720 --app=MY_URL
Restart=always

[Install]
WantedBy=multi-user.target


  


  ffmpeg.service

  


  [Unit]
Description=start ffmpeg
Requires=display.service pulseaudio.service
After=pulseaudio.service

[Service]
User=ubuntu
Type=simple
ExecStart=/usr/bin/ffmpeg -y -f x11grab -draw_mouse 0 -s 1280x720 -i :1.0+0,0 -f pulse -ac 2 -i default -c:v libx264 -c:a aac -b:a 128k -f flv MY_SERVER
Restart=always

[Install]
WantedBy=multi-user.target


  


  I do not see any errors in my syslog regarding the audio. I can't figure out why it would work from shell but not from systemd.

  


  I tried the following :

  


  

  • Ran pulseaudio systemwide

  


  • Tried to setup systemd under root user

  


  • Tried to setup systemd under non root user

  


  • Tried all possible pulseaudio params

  


  


• opus_pvq : improve PVQ search for low Ks

  24 février 2017, par Rostislav Pehlivanov

  opus_pvq : improve PVQ search for low Ks
  Since the probelm mentioned only happened when the phase was negative
  
  (e.g. the sum had to be decreased), only discarding dimensions with a
  
  zero pulse in that case restored the search’s previously low distortion
  
  at low Ks when the phase is never negative.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/opus_pvq.c