Hello

has anyone else experienced this problem:

Sometimes when I create an instant replay channel with 4 input and stop/restart the recording, stop/restart one camera or unplug and plug camera input back in it only shows black on that instant replay input. I have to either restart Vmix or delete the instant replay input and create a new one to get the video source back in the replay channel.

And yes, the original camera input always works and shows no black screen.

Hi,

As a general rule, replay assumes that all cameras will remain permanently plugged in throughout the session with the same format.
This is important for a number of reasons, as having cameras randomly disconnect can cause sync issues with the replay.

vMix 17.0.0.110 makes this a bit easier to deal with in that if you have a camera unexpectedly disconnect
then you can stop recording, click the cog icon and click ok again to have vMix search through all the cameras and configure them again.

Regards,

Martin
vMix

Could this be a problem that came up with the update where you made Vmix recognize the input video sources and resolutions on itself?

I dont think that I ever had an issue with that last year.


And no...the recording shouldn't stop, it should record black as long there is no video source, but it should recognize new and changed video inputs on itself (if it has the same resolution and framerate as the configured instant replay input) and show it once it's plugged back in.

We built the entire replay system from scratch, so it doesn't use any open source code from FFMPEG and the like.

Anyway, I think I have worked out the best way to deal with this.
It will involve checking each stream for gaps longer than half a second or for discontinuities where the capture card resets the timestamps.
Then it will create a new recording segment at the current time just for that stream without interrupting the others.

This approach will avoid needing to fill in blank frames, improving performance, while also hopefully making the recording
more robust to unreliable sources or from network sources like NDI.

If this sounds good, I will try and get this added to the vMix 18 beta due any day now.

Regards,

Martin
vMix

What I meant was that there is a build in auto detect for camera inputs since Vmix 17 (i think). When I create an 1080i camera input and plug a cable with a 720p input in, it automatically detects the 720p source and converts the once 1080i input to an 720p input. Could this be the source of the problem?

Im using Blackmagics Decklink Quad (1)


And I don't really understand how your solution prevents recording a black screen, would I have to go to the cog and press ok to have the video source again in the instant replay input or will it also be automatically detected?

Let's say a camera guy turns off his camera unbeknownst during the break and the second half of a football match starts. Something happens and I want to create an event from that camera angle, but it's only black because A: I didn't know the camera was turned off for a short time (maybe it was only a couple of seconds), B: I didn't see that the input was black, because the instant replay channels won't show all instant replays channels live input. I can only see the "normal" live camera input and those work just fine, because they automatically detect the signal and won't have a problem when the source is unplugged or turned off for a second.

Please contact support:

https://www.vmix.com/contact-us.aspx