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xaver  
#1 Posted : 8 years ago
xaver

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I try to get a negativ audio delay in a RTSP stream

it's not working

a positiv audio delay works, but my stream needs a video delay

how can I solve this?
mjgraves  
#2 Posted : 8 years ago
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Despite centuries of effort, travel back in time is still not possible ;-)

A stream arrives (v+a) an audio "delay" will retard that presentation of the audio relative to the video.

A negative audio delay is not possible.

A video delay would retard the presentation of the video relative to the audio. Not exactly sure if/how that might be done in vMix.

As has been mentioned elsewhere hereabouts, many times, RTSP/RTMP are not really suitable for production purposes. Most especially when you have concerns about latency. Which is sounds like you have.
xaver  
#3 Posted : 8 years ago
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but why can I setup a negative audio delay (-1000 msec is possible) if it's not working?

positive delay (tried up to 5 sec) works very well in that RTSP Stream
mjgraves  
#4 Posted : 8 years ago
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xaver wrote:
but why can I setup a negative audio delay (-1000 msec is possible) if it's not working?


I would suggest that's a quirk in the user interface. You can't do anything to a signal that hasn't arrived yet.

A negative delay is not possible without time travel.
xaver  
#5 Posted : 8 years ago
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is there any chance to get a video delay?
mjgraves  
#6 Posted : 8 years ago
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xaver wrote:
is there any chance to get a video delay?


The following thread describes adjusting a network buffer in order to achieve a long delay of an output stream.

https://forums.vmix.com/...aspx?g=posts&t=11251

I'm not sure if or how you could delay an input stream.

I'm always trying eliminate latency. I've noticed that some video processing, like layering, scaling, etc. can add a little delay. Sometimes as much as a few frames.

For example, I can set a webcam (Logitech Brio) for 4K but bring it into a vMix project running at 720p30. The webcam stream will be delayed by the requirement to scale it down.
mjgraves  
#7 Posted : 8 years ago
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I see that in the source settings, in the Advanced menu, there's an option for "Delay." It's enabled for a webcam, but not for an RTMP/RTSP stream.

When used with a webcam, I can enter a delay value (in frames) and the software automatically creates a suitable buffer to achieve the desired delay.

Perhaps in future this mechanism can be extended to allow delay of an incoming stream.
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