Latency in QO-100/DATV custom firmware by F5OEO

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mamdo
Posts: 1
Joined: Mon Jul 06, 2020 1:06 pm

Latency in QO-100/DATV custom firmware by F5OEO

Post by mamdo » Mon Jul 06, 2020 1:26 pm

Hi every one.

i'm using QO-100/DATV custom firmware by F5OEO
i give it a shot and it's fantastic.

i have one question about latency.
i'm trying OBS,VMIX and Gstreamer "command line" , and all three have latency around "2.8" second. received with sdrangle and leansdr.

using corei7-7500 as transmitter and reviver .
hackrf or rtlsdr in reviver .

in OBS :
using default setting, get around 6 second latency . But when put "Key frame interval = 1" reduce latency to 2.8 second. this for both reciver sdrangle and leansdr.

in Gstreamer :
this is my command
gst-launch-1.0 v4l2src device="/dev/video2" ! video/x-raw,width=640,height=480 ! videoconvert ! x264enc pass=cbr tune=zerolatency bitrate=1000 sliced-threads=true speed-preset=1 vbv-buf-capacity=20 key-int-max=50 rc-lookahead=1 ! flvmux ! rtmpsink location='rtmp://192.168.2.1:7272/,437,DVBS2,QPSK,1000,34,0,nocalib,1,32, live=1'
also "key-int-max" is the major parameter to reduce Latency from 6 second to 2.8 second.

My question here Can i reduce this 2.8 second to less than one second ?

thank you again ^_^

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