Video Streaming

ffmpeg -h encoder=libvpx-vp9 # Mostrar opciones

-framerate 25

-c:v libvpx-vp9 -b:v 2500k -c:a libopus -b:a 128k -ar 44100 

-qmin 4 -qmax 48 -quality realtime -speed 5 -static-thresh 0 -max-intra-rate 300 -error-resilient 1 \ #libvpx
-tile-columns 2 -frame-parallel 1 -row-mt 1 \ #VP9
-threads 5 -f webm output.webm # ffmpeg

-r 25 -g 75 -s 1280x720 -quality realtime -speed 5 -threads 5 -row-mt 1 -tile-columns 2 -frame-parallel 1 -qmin 4 -qmax 48 -b:v 3000k

-minrate 2000k -maxrate 23000k #CBR
-crf 32 #CQ

-c:v libvpx-vp9 -b:v 2000k -c:a libopus -b:a 128k -ar 48000 -minrate 2000k -maxrate 2000k -qmin 4 -qmax 48 -quality realtime -speed 8 -static-thresh 0 -max-intra-rate 300 -error-resilient 1 -tile-columns 1 -frame-parallel 1 -row-mt 1 -threads 5 -f webm output.webm

vainfo --display drm --device /dev/dri/renderD128
ffmpeg -hide_banner -hwaccels
ffmpeg -hide_banner -encoders | grep vaapi 
ffmpeg -hide_banner -h encoder=vp9_vaapi
for i in encoders decoders filters; do
  echo $i:; ffmpeg -hide_banner -${i} | egrep -i "vaapi"
done

#Encode
ffmpeg -vaapi_device /dev/dri/renderD128 -i input.mp4 -vf 'format=nv12,hwupload' -c:v vp9_vaapi \
-b:v 3M -maxrate:v 3M -minrate:v 3M vp9_output.webm

ffmpeg -vaapi_device /dev/dri/renderD128 -i input.mp4 -vf 'format=nv12,hwupload' -c:v vp9_vaapi \
-global_quality 50 -bf 2 -bsf:v vp9_raw_reorder,vp9_superframe output.webm

ffmpeg -vaapi_device /dev/dri/renderD128 -re -i input.mp4 -vf 'format=nv12,hwupload' -c:v vp9_vaapi \
-g 150  -compression_level 1 -bf 4 -bsf:v vp9_raw_reorder,vp9_superframe -b:v 3M -maxrate:v 3M -minrate:v 3M vp9_output.webm

# Transcode completamente en HW
ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -i input.mp4 \
-c:v vp9_vaapi -b:v 3M vp9_output.webm

# TC HW + Si no sabemos el formato de la fuente
ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -i input.mp4 \
-vf 'format=nv12|vaapi,hwupload' \
-c:v vp9_vaapi -b:v 3M vp9_output.webm

FDSDIR='/etc/firewalld/services'
FDSOWNCAST="$FDSDIR/owncast.xml"

if [[ -d $FDSDIR ]] && [[ ! -f $FDSOWNCAST ]] ; then
  cat <<'EOF' > $FDSOWNCAST
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>owncast</short>
  <description>Streaming (RTMP-1935) + chat out of the box (TCP-8080)</description>
  <port protocol="tcp" port="8080"/>
  <port protocol="tcp" port="1935"/>
</service>
EOF
  firewall-cmd --permanent --zone=home --add-service owncast
  systemctl restart firewalld.service
  systemctl --no-pager --full status firewalld.service
else
  echo "O no exite $FDSDIR"
  echo "O ya exite $FDSOWNCAST"
fi

<p><iframe src="https://live.autistici.org/#gnulinuxvalenciasocial" width="800" height="600" frameborder="0" allowfullscreen="allowfullscreen"><span style="display: inline-block; width: 0px; overflow: hidden; line-height: 0;" data-mce-type="bookmark" class="mce_SELRES_start"></span></iframe></p>

For your original mp4 to work in the online player we currently require the file to have:
audio: aac
video: h.264
moov atom: front
pixel format: yuv420p