Hi, trying to adjust the PTZ5A4M-25X bit rate

[bigredfish]

Yes I see a difference, I'm just saying I dont believe that bitrate is real being maintained.

If it is that news to me

 

[bigredfish]

5442 1/1.8 sensor
Exposure, 0-2ms
DNR 30
12288 Mbps CBR



Same with ROI on entire screen



Both show Bitrate in SmartPSSLite bouncing around 12-14Mbps. Same reading on the NVR

 

[bigredfish]

Two videos
5442H-ZHE 4MP 1/1.8 sensor
Both Exposure 0-2, CBR, DNR 30

SEE Text file output attachments for each from MediaInfo showing video details/specs
You're not getting real 40-60Mbps out of that camera. BI is fibbing

1st
16,384 Mbps (which is MAX) with ROI MAX on entire screen
File Size about 27MB
View attachment 192.168.1.110_ch6_20250502134400_20250502134415.mp4



2nd
12288 Mbps (my normal on this camera) NO ROI
File Size about 20MB
View attachment 192.168.1.110_ch6_20250502135209_20250502135224.mp4

 

[biggen]

I do see the difference on the water ripples you are talking about. It may because you have it zoomed in so close the difference in water rippling is apparent. I don't know if I've ever seen a water shot that zoomed in.

Have you tried a different compression? H.265 vs H.264?

 

[bigredfish]

I think H.264.H is best quality compression

 

[quantum999]

I tried H.265 but even at over 50mbps, I thought the quality was better with H.264.H.

I will try to upload a video at 11 and 50Mbps....

 

[quantum999]

Here it is. 5 sec clips, one is 28.9MB, the other 6.1MB.

 

[quantum999]

I think the 5442 hardware is reaching it's max at around 16384 Mbps and there is no spare room for ROI at that speed. If a lower bit rate is used, adding ROI will probably increase the bit rate.

The PTZ5A4M-25X hardware seem to have a lot of spare room for higher bit rate but the web interface limits it too much in my opinion.

 

[bigredfish]

Crazy.
I guess I stand corrected.!

I can't make mine do that... Let me fiddle with it.

I have a couple of SD6 PTZs that in theory should be every bit as powerful as the 5A4M

 

[biggen]

If you up the frame rate to 30 with an iframe of 30, using H.264 with the max resolution it enables the option to up the bitrate to ~16Mbps. Maybe worth a try.

I've also never messed with the Smooth/Clear slider so I'm not sure what exactly that does.

 

[bigredfish]

I wonder if FPS could make a difference allowing more bits per frame?

@wittaj didn’t you hypothesize that once? Or am I dreaming (could have been the bourbon)

 

[quantum999]

With 30fps and I frame interval of 30 the bit rate can go up to 16384. With H265 it only goes up to 10240.

For now I will just use the API to set it to 21Mbps and see how it goes. I just have to remember setting it again after I use the web interface...

 

[wittaj]

I wonder if FPS could make a difference allowing more bits per frame?

@wittaj didn’t you hypothesize that once? Or am I dreaming (could have been the bourbon)

Yep once upon a time we proved that, but it may be camera specific as well LOL.

 

[bigredfish]

I wonder if FPS could make a difference allowing more bits per frame?

@wittaj didn’t you hypothesize that once? Or am I dreaming (could have been the bourbon)

nope that didnt work on the 5442

 

[bigredfish]

I think the 5442 hardware is reaching it's max at around 16384 Mbps and there is no spare room for ROI at that speed. If a lower bit rate is used, adding ROI will probably increase the bit rate.

The PTZ5A4M-25X hardware seem to have a lot of spare room for higher bit rate but the web interface limits it too much in my opinion.

Welp you are correct sir.
The 5442 series can't get there but my SD6 PTZ was able to get 26Mbps using 16,384, CBR, H.264.H and Full ROI

View attachment HOAEntrP2P_ch1_20250502170601_20250502170610.mp4

 

[biggen]

Turning on ROI on my 5A4M with H.264 compression, max res, 15fps, and 15 iframe my bandwidth tops out at ~15Mbps even though CBR is still set for 11776. If I turn off ROI, then bit rate falls back down to ~11Mbps which is the maximum setting for the CBR with these settings.

I don't understand why ROI needs to be turned on to eek out more bit rate. Why doesn't setting the maximum CBR rate already give you maximum bit rate capability.

 

[bigredfish]

Looks like it only works on certain models with built-in higher bitrate capability than the web GUI allows as @quantum999 said.

The theory behind ROI was that a lot of folks run dismal low bitrates on standard recording and you could specify an area of interest, ROI ,where it would jack up the rate to something approaching really good quality, say a choke point.

I just have never tried max'ing it out on a camera that had the added capability to go beyond what the specs and web GUI allow

 

[quantum999]

I wonder if the maximum bit rate is affected by other functions such as IVS/movement detection? I am not using any yet.

 

[bigredfish]

LOL, I tried that a little bit ago on a different SD6 PTZ with a bunch of kids it was tracking, and got wild bitrates of 95Mbps !

The video was jerky and choppy, obviously the camera couldnt handle it

This was an SD6 with a 1/2.8 sensor running 16384 and full ROI 30FPS, CBR

View attachment HOARearP2P_ch1_20250502175500_20250502175510.mp4

 

[quantum999]

95Mbps is insane. That's why I hesitate to use it, it is unpredictable and unbounded, until something gives out.