Nevermind, just ignore it. SRT is the new hot shit so who needs NDI... ;-)

SRT BUG: Maximum allowed Latency is currently 1999, should be unlimited.

BUG: Sometimes, playing this video file: https://we.tl/t-cypAVV16st results in vMix dropping frames (Renderer Droped). About 1-2 frames per second. When I enable SRT Hardware Encoding H.264 @6Mbps, after some time it will drop about 5 frames per second. CPU/GPU usage seems alright. It happens sometimes.
Windows 10 LTSC, i7-6700HQ, 48GB RAM, GTX980M, 1080p60 preset

UI BUG: When opening SRT Enable/Disable dropdown from the External cogwheel right after wMix opening, it takes second or two for the dropdown triangle to appear and then the dropdown opens. May be related to starting the SRT stream at the same time?

Just installed the latest version on my old Dell laptop. This would run 22 fine if you didn't push it, but 23 shows GPU OVERLOAD before I even added any sources!

Dell Latitude
Windows 7
i5
16gb Ram
SSD
Intel HD Gfx

It'll play a single video reasonably well in Output but the source window runs at about 10FPS.

Thanks for SRT, so far seems good.

Things I've tested:

Vmix to Vmix SRT very good.

Vmix to Nimble Streaming Server SRT very good. Drops right in as a replacement for RTMP (FFMPEG2) ingest to the server. The latency is higher, by 50-70ms but RTMP has no error/packet loss recovery so that is the trade off.

Vmix --> OpenVPN --> Vmix SRT no problems (didn't want to open a port at the office), worked just as well. Made me think maybe I could control a PTZ with the video coming in via SRT and run productions remotely. Something for another day.

Vmix --> OpenVPN --> VLC Player with srt:// url works, but no matter the settings I've adjusted so far, I can't eliminate around 1 second latency in VLC.

Mostly on the latency setting the rule of thumb I've read is 4 x the ping time is a good place to start and try to not go under 100ms, most of my testing has been 100ms.

I have not tested passwords at all yet, maybe soon.

Anyone know of an SRT player program like VLC (NDI Studio monitor for SRT style)? Let me know, I'm after something that doesn't add extra latency. Vmix can be used as a player, but seems a big program to just play SRT from a PC on a network. I might be missing something on VLC, but I spent about an hour trying various settings on VLC for cache, network buffers etc.. I just couldn't bypass the extra 1 second delay using VLC for SRT playback.

The stats in Vmix said it was 20ms RTT SRT to VLC. But VLC must be adding extra buffering as it was over 1 second, where vmix to vmix in the same setup was about 0.3 seconds, over a 20ms RTT.

SRT worked well on a residential NBN100 connection here in Australia going to my office on a Gigabit Fiber. I plan to do more testing on 4G later. That should be a bit more challenging for SRT, but that is exactly what SRT is designed to handle.

I did not encounter problems going for over 5 minutes. I did quite a few 3 hour + test and the latency and quality remained good except for VLC it paused sometimes. Which makes me think VLC is not a good SRT player (yet).

Martin said SRT is like NDI for the Internet, so far seems like NDI HX for the Internet. I'm not an NDI HX hater, it's good if you are not worried about a bit of quality loss. I understand the big budget broadcasters can't handle that. I'm not one of those, so I accept some loss and like JPEG, not Camera RAW shocker!

Speegs, Have a look further up the thread. Martin explains this. The behaviour is the same in other implementations of SRT I am testing.

Cheers

Andrew

andrew,

Can you try disabling the Use Hardware Encoder on the TX? I have seen some issues with the Intel encoder on low end systems (like NUCs).
Usually a driver update resolves them however.

sam602,

We are currently using the standard SRT 1.3.4 library.
One thing I will note is we do set the key size to the highest (256bit/32bytes) while the example Wowza mentioned is only 16 bytes
so maybe there is an issue with the SRT version Wowza uses in accepting 32 byte encryption.

EDIT: Larix broadcaster is using an older version of SRT than 1.4, looks like 1.3 or lower as it was last updated in June 2019,
so that might be why it is working.

Does srt supports interlaced video?
is it vMix limitation?

SRT in vMix is designed to (hopefully) be as simple as possible to setup and configure.
For that reason these settings will not be available as changing them from the defaults tend to cause more harm than good for the vast majority of use cases.

Also to answer your question, maxbw etc are all handled automatically by the SRT library and it tends to work quite well.

Linking the new Mix input.

But.... i do a lot of IMAG work with vmix and it would make the feature even better would the ability to have the main program mix as an input, this way a mix input can be used for doing a second mix with the option to mirror the main mix when needed

cheers

Ian