• ✅ Technical and creative solutions for your film.
    ✅ Screenplay formatting help, plot and story guidance.
    ✅ A respectful community of professionals and newbies.
    ✅ Network with composers, editors, cast, crew, and more!
    🎬 IndieTalk - Filmmaking and Screenwriting help site and community.
    By filmmakers, for filmmakers since 2003

editing LCD Monitor Latency - Avid

A

alexo

Hello,

I`ve been digging up some older monitors to use on a "Harpertown" 2008 Mac Pro Avid I am putting together, and I wanted to check about video/audio sync latency when using Avid with LCD monitors.

Set up will be software only for the time being.

The monitor I have that I want to use, as my playback monitor, is a LG LCD monitor with a 2ms (grey to grey) latency.
http://www.newegg.com/Product/Product.aspx?Item=N82E16824005134

I believe a 2ms(GTG) translates to around 6ms.

I know that there that can be some video/audio sync issues when playing out an Avid timeline to an external LCD or Plasma client monitor with high levels of latency, but I`m wondering will I have to apply any audio delay compensation when using a single LCD monitor with 2ms (grey to grey) of latency?

I would be checking manual clapperboard syncs on this Avid set up, so I want to make sure the monitoring is accurate.

Audio monitoring would be headphones plugged into the Mac Pro.

Any insight or monitor recommendations would be very helpful.

Thanks
 
Sort by date Sort by votes
There are quite a few variables in the equation, not just the video monitor. There's also the latency of the audio conversion and the latency of the video card. The only way of knowing accurately the difference between the two is by using something like the Syncheck.

There is potentially another variable which can affect A/V sync, depending on your distribution format. The difference between the speed of sound and the speed of light can come into play, for example at a film festival screening in a cinema. The speed of light is effectively instantaneous whereas the speed of sound is roughly 1ft = 1ms. So if the sound is perfectly in sync during editing, someone sitting about 40' from the screen in a cinema will hear the sound roughly 40ms (1 frame) later than the picture, someone 80' from the screen will hear it roughly 2 frames late, etc. Even in a sitting room, the difference between having the sound produced right in your ear (headphones) and having the sound produced by a TV, 10 or so feet away, could be 10ms or more. Although, A/V sync in broadcast streams often has issues which can dwarf the speed of sound issue.

G
 
Upvote 0 Downvote
You must log in or register to reply here.
Back
Top