delay video

[zbynekdrlik]

Hi, I am looking how to delay video in ultragrid as obs video delay filter is unstable and get always different number. I see that ffmpeg has that type of parameter.

Thanks

[MartinPulec]

Hi, it depends. There is an option to delay video in relation to audio. In theory it can be used, depending on actual situation. My questions are:

1. do you use audio as well or only the video?

2. what is approximate duration of the delay?

If the responses is "no" and something below 1 second, you could use something like:

uv --audio-delay -AMOUNT_IN_MS

I'll explain – in this mode audio or video is delayed given amount of milliseconds, in case of negative value, video is delayed (as we cannot present video earlier). My second question is because I am not unsure if this trick scales well beyond let say few second; other approach will be perhaps more eligible.

[zbynekdrlik]

Audio is coming to destination by different route and is around 1 second latter then video. Audio is highly processed by high latency ai plugins in daw and thats reason why video is receiving sooner then audio.

[MartinPulec]

Thanks for the info, so we'll try to add video delay postprocessor. Adding the delay to -1000 ms as I proposed above may or may not work but it is slightly on a borderline of what is rather misusing that parameter.

[MartinPulec]

I've just added the delay video postprocessor that might be able to do the task, example usage:

uv -p delay:sec=1.5 -d gl

The code should be built in continuous in few moments.

[zbynekdrlik]

Thanks