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waltesefalcon

waltesefalcon

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Hey gang, I am seeking some help. I am attempting to convert some old VHS to digital.

I have an RCA to HDMI adapter, and an HDMI Video Capture plug. On my computer I am running Linux Mint 21.3, and my video capture software is OBS Studio.

I have successfully captured a couple of videos, but in both instances it is like watching a dubbed Kung Fu movie, the video and soundtrack are not perfectly synced up. Has anyone else encountered this. I can't figure out anyway to edit the video I have to sync up the video and audio, so right now I have annoying videos. Does anyone have any idea of how to fix this?
 
Walt - message Brooklands (Dave). He does a lot of video conversion work.
 
Analog to digital video is always a bit tricky, because you have 2 seperate streams (technically 3 if you count the left/right on the stereo pair as independant). Does your RCA to HDMI adaptor capture both the audio channels and the video, or does it only capture the video and you are having to bring the audio in through a different interface? If its all coming through the HDMI than it should not get out because the latency would be the same for the audio and video. OBS has an "sync offset" option under the advanced audio properties (on my version I get to it by right-click on the audio track), playing with that might get you somwhere if the audio is ahead of the video (I'm not sure you can put a negative value in if its the other way).
 
YakkoWarner said:
Analog to digital video is always a bit tricky, because you have 2 seperate streams (technically 3 if you count the left/right on the stereo pair as independant). Does your RCA to HDMI adaptor capture both the audio channels and the video, or does it only capture the video and you are having to bring the audio in through a different interface? If its all coming through the HDMI than it should not get out because the latency would be the same for the audio and video. OBS has an "sync offset" option under the advanced audio properties (on my version I get to it by right-click on the audio track), playing with that might get you somwhere if the audio is ahead of the video (I'm not sure you can put a negative value in if its the other way).
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My RCA to HDMI does capture all three channels: video, and left and right audio. I will have to look at the advanced audio settings again.

I'll mess with the offset and see if I can fix it.
 
Last edited:
Take a look here at Real time scheduling
You could also try System Monitor. Launch OBS, Open System monitor, right click OBS in there under Processes. Then change the priority to "very high".
 
Thanks Greg, I may try that as well.

I currently have gotten decent results by setting the sync, for my first VHS I set it to 900ms delay and synced up the audio and video. On this second one, I have had to set the sync at 1500ms to sync up audio and video.

When I do the next one I will go into system monitor and set OBS to very high priority first.
 
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