Latency in QO-100/DATV custom firmware by F5OEO

Area for discussing streaming over the Internet, especially as it relates to ATV
Forum rules
This forum is run by the BATC (British Amateur Television Club), it is service made freely available to all interested parties, please do not abuse this privilege.

Thank you
Post Reply
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://,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 ^_^

Post Reply

Return to “Streaming”