We are a professional sprint kart track that likes to live stream our local races and have been using vMix for a while. We started out with some cheap Dahua IP cams and 1 Dahua PTZ. Everything was mostly fine, some ghosting or skipping in the video once in a while. We recently bought 8 Lilin UFG1122EX IP cameras, they do 120FPS at 1080P. We need the faster frames because the karts are going past the cameras at up to 80-90MPH, 30 FPS isn't cutting it. I originally set the new cameras up at 120FPS and it was unwatchable, I scaled them back to just 30FPS where the Dahua cameras are and it still kinda bad. I had a slight issue with dropped frames with the Dahua's but the Lilin cameras are really bad. I have done my searching and found the article for improving performance in vMix, it didn't help.

We have been using the Lenovo for streaming with vMix, the custom build is running Blue Iris to record the streams. I even installed a trial of vMix on the custom build and get the same results with the dropped frames. I have attached some screenshots.

I am not going live yet with the new cameras, all I am doing is adding them as inputs in vMix and looking at the statistics. The camera is streaming at 30FPS/1080p/VBR/4Mb Bit Rate.

vMix is set for the correct parameters 1080p / 30p.

2 systems:
Lenovo IdeaCentre K410
Intel Core i7-3770 Processor 3.4 GHz (8 MB cache)
8GB DDR3
2048 GB 7200 rpm Hard Drive
Nvidia GT 620

Custom Built:
AMD FX-8350 Black 8 Core 4.0GHz
4 3TB 7200 RPM Seagate Barracuda's in RAID 5
8GB DDR3 1600
GeForce GTX 960

Latest version of vMix on both all updates for everything done.

Cameras are IP cameras, inputs are RTSP streams. All network equipment is Gigabit Ethernet. POE+ switch has more than enough wattage for all cameras.

All help is welcome. Thank you in advance.

Thank you kgoodyer for the help and suggestions.

I disconnected all cameras from the POE switch except for one. I then plugged the Lenovo computer into the switch as well. So all that was connected to the switch was one camera and the computer.

I opened the stream in vMix and the dropped frame issue was still happening. I then opened it in VLC and it was still dropping frames but not nearly as fast. I have attached screenshots.

Yes we are using h.264 for codec. I tried the one camera in vMix using UDP before and tried it again, it will drop frames then vMix throws a "Connection Error" message for the input and then it picks up again and cycles like that, continually dropping the connection. This is why I was using RTSP TCP.

The switch is a TP-LINK TL-SG1008PE. It is 802.3af/at PoE compliant and has 16Gbps switching bandwidth.

I've never used these devices, but you could try a larger package size, if one is available in that drop down and definitely try that RTSP/UDP Port, but change Vmix to RTSPUDP as well and see if that works. Like kgoodyer said udp is definitely better for speed on a LAN where packet loss shouldn't be a big problem. That is also something you should check, while streaming ping the device constantly while testing. That will in theory show signs of packet loss and high response times if the LAN is playing up.

120fps is pretty quick, I certainly watched my cpu resources quickly disappear at high frame rates with FMLE, also worth trying @ 720p first and working your way up to 1080p to see if lowering the pixels you are moving helps the situation. Sorry I only have "generic" troubling shooting advice as I'm usually very happy to have 50 fps or 1080i and I tend not to use IP capture devices as they add latency sorting packets/decompressing and I imagine use significantly more cpu than semi-hardware capture devices since they do more work to get the pixels into the computer.

I see why you are running out of ideas, double check the computers cpu not in mix but the entire task manager.. I'm stumped too. I'm guessing the camera has no cpu info, worth looking if you can connect to it via a shell you can often run the Linux command top to see how hard it is working.

Hi,

Source dropped frames for RTSP just means the camera is not sending frames as fast as the vMix frame rate.
This is normal if the camera is not sending the full 30fps.

Regards,

Martin
vMix

Selfish bump, desperate for help.

I will have to say (and I don't know what Codec your cameras are using... guessing h.264) is that the PC will have to do some pretty heavy work decoding 4 x 1080p web streams simultaneously - now it maybe that the vMix GPU based codecs have the performance needed, but I can only do 12 SD H.264 decodes on a reasonable PC, let alone HD.






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An update of the cams since I posed my last post without hitting the reset button.