Blackmagic Forum

Hi All,
during last event, I used ATEM 1E and I recorded video and audio on HyperDeck Studio. Signal audio imported to ATEM 1 directly from audio mixer. Today imported my footage to Sony Vegas Pro 12 and my audio is delayed 3 frames. Why ? How I can change this ? Any ideas ?

Sebastian

Hello,
thats normal with the Audio delay - the easy way is import the audio at the camera and you have the complett way from the digital signal with all digital delays. the other way is the audio signal need a delay from the audio mixer (then it is a digital mixer - please look for delay) or you must take a audio delay unit for the syncronisation from audio and video.

Regards

Are you sure that it is your audio that are delayed, normally we have a video delay of up to 2 frames within the ATEM1, 1 frame if you don´t use the dve and 2 if you use it. Depending of type of camera used the delay can be more. There is nothing that can cause the audio to be behind if you don´t have set a audio delay in the audio mixer thats more than 2 frames.

Hakan

Every time the video goes through a frame sync or is re-clocked, you are going to drop back a frame in the video. So, you'll get one frame just going into the ATEM. Using a HDMI to HD-SDI converter? That might cause another. Going into the Hyperdeck might very well cause another. Using the DVE in the ATEM will cause another. It adds up. By three or four frames you start to notice it. Since you have the footage in your editor, it should be easy for you to scoot the audio forward two or three frames, and it is fixed in the edited version. If you want a live hardware solution, this should do the trick: http://www.rane.com/ad22s.html
Put it inline after your audio board, go to video mode and dial in two or three frames of delay, and that should take care of it.

This is all assuming you confused audio and video delay, and that your problem is actually a video delay.

Today imported my footage to Sony Vegas Pro 12 and my audio is delayed 3 frames. Why ?

You can correct it in Vegas in a few minutes. But I don't understand, how audio can be delayed to video. normally, video is delayed to audio (which can be corrected in live recording by using an audio delay unit) ...