Audio and video won't sync

ijonty

Hi folks

I recorded some vocals and guitar live into Reaper, while I also fimed myself with my iPhone 11.

When I tried to put them together in iMovie (using the audio from Reaper with just the visuals of the film footage) it slowly went out of sync. Is this because they record in different formats or something?

How would I avoid this problem?

Thanks,

J

Danny1969

It's normally clock error .... generally with pto kit the audio and video share a clock and stay in sync .... you can often get away with 2 non clocked devices but you may notice some drift after 2 mins or so which will slowly increase over time until it's like a short delay. 
I have found for some reason recording audio at 48K syncs with iphone video better 

If you have no luck split the video and nudge the regions as you go before you render to manually stay in sync

mrleon83

It can also be if one has bad audio, that’s what I found using final cut ... it maybe different but it’s the audio that gets synced

ijonty

Danny1969 said:

It's normally clock error .... generally with pto kit the audio and video share a clock and stay in sync .... you can often get away with 2 non clocked devices but you may notice some drift after 2 mins or so which will slowly increase over time until it's like a short delay. 
I have found for some reason recording audio at 48K syncs with iphone video better 

If you have no luck split the video and nudge the regions as you go before you render to manually stay in sync

Thanks, yes, the nudging kind of worked but it was a bit fiddly. How do I record audio at 48K in Reaper?

Danny1969

Click File, Project settings then move drop down box from 44.4 to 48000

Set this first before you begin recording 

Modulus_Amps

I had this problem before with cubase, luckily I was able to take the audio wav files and import them to the correct clock speed and it sorted it for me. good luck.

ijonty

Great thanks, I'll try!