The output wants to be as low frame rate as possible for low symbol rates. You are probably sending it 59Hz or 60Hz which the Jetson struggles to encode. Set it to 25 on the graphics card and see what pertains.
Mike
Latency improvements ?
Re: Latency improvements ?
Hi Mike,
perhaps my post wasn't clear - but yes setting the frame rate to 25 on OBS and on the video card does seem to helped stability - at least for now until I break something else !
Still a little odd that 60p works ok from the cam corder though even at high symbol rates implying the Jetson can cope ok - it just doesn't like the video from the PC unless I reduce frame rate down to 25.
perhaps my post wasn't clear - but yes setting the frame rate to 25 on OBS and on the video card does seem to helped stability - at least for now until I break something else !
Still a little odd that 60p works ok from the cam corder though even at high symbol rates implying the Jetson can cope ok - it just doesn't like the video from the PC unless I reduce frame rate down to 25.
Re: Latency improvements ?
It is odd but we noticed this too - perhaps the video is softer from the camera?
Mike
Mike
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F1CJN_alain
- Posts: 94
- Joined: Thu Jul 21, 2011 9:50 am
Re: Latency improvements ?
I am testing OBS to UDP to Jetson Nano to Lime (without ffmpeg).
The total delay (transmitter and Minitiouner receiver) is around 3 seconds total (see the clocks on the images).
It works but the image quality has to be improved.
73's
Alain F1CJN
image error : I updated the image because I am in recording mode for UDP in OBS (and not streaming).
The total delay (transmitter and Minitiouner receiver) is around 3 seconds total (see the clocks on the images).
It works but the image quality has to be improved.
73's
Alain F1CJN
image error : I updated the image because I am in recording mode for UDP in OBS (and not streaming).
Re: Latency improvements ?
Hi Alain
good way to check latency with the clocks - I'll try that next time.
Can you please post how you set OBS to send directly to Jetson nano as I'd like to experiment with that technique.
Mike,
yes very odd about the camcorder, I suspect the timing on the PC video card isn't quite right right, just a hunch though.
REgards Tim
good way to check latency with the clocks - I'll try that next time.
Can you please post how you set OBS to send directly to Jetson nano as I'd like to experiment with that technique.
Mike,
yes very odd about the camcorder, I suspect the timing on the PC video card isn't quite right right, just a hunch though.
REgards Tim
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F1CJN_alain
- Posts: 94
- Joined: Thu Jul 21, 2011 9:50 am
Re: Latency improvements ?
This is my configuration to output the OBS UDP stream to the Jetson (333k).(Don't use the LKV373A any more)
Just switch the LKV address in the Jetson Nano file to the UDP address from the pictures below.
Note : the audio encoder "mp2fixed" is very important in order to be accepted by DVBSDR.
It is a starting point, not perfect so it can be improved ....Let us know.
Best 73's
Alain F1CJN
Just switch the LKV address in the Jetson Nano file to the UDP address from the pictures below.
Note : the audio encoder "mp2fixed" is very important in order to be accepted by DVBSDR.
It is a starting point, not perfect so it can be improved ....Let us know.
Best 73's
Alain F1CJN
Re: Latency improvements ?
Thanks - some questions:
Exactly what goes in the nano script and why is the UDP address 239.0.0.1 ?
Mike
Exactly what goes in the nano script and why is the UDP address 239.0.0.1 ?
Mike
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F1CJN_alain
- Posts: 94
- Joined: Thu Jul 21, 2011 9:50 am
Re: Latency improvements ?
Modifying the "jetson_nano.sh" script.
If you have already a working "jetson_nano.sh" script for SR333 with the LKV373A.
It just need to switch LKV the videosource address to the new address from the OBS from my previous mail.
Just modify two lines:
VIDEOSOURCE_IP_ADRESS=239.0.0.1
VIDEOSOURCE_IP_PORT=9999
Why I choose this address ... why not, may be from a tutorial.
Best 73's
Alain F1CJN
n
If you have already a working "jetson_nano.sh" script for SR333 with the LKV373A.
It just need to switch LKV the videosource address to the new address from the OBS from my previous mail.
Just modify two lines:
VIDEOSOURCE_IP_ADRESS=239.0.0.1
VIDEOSOURCE_IP_PORT=9999
Why I choose this address ... why not, may be from a tutorial.
Best 73's
Alain F1CJN
nRe: Latency improvements ?
That's what I thought - unfortunately it does not work and I get continuous underflow errors.
Mike
Mike
Re: Latency improvements ?
No. Still not working. It worked in loopback to VLC once than failed to work again. I am going to give up. Please do not write a Wiki until we have this working reliably. Otherwise others will have the same issues.
Mike
Mike