How do I sync external audio & video with no on-camera audio?

[anthohknee]

Hey y'all,

I didn't do any on-camera sound and I'm trying to sync my external audio from my Zoom H5 to my Canon C300 external video files.  I've been taking the INs from when the clapper hits on both the video/audio, but can't figure out how to combine them.  Merging seems to only be for syncing, but I only have static from my C300 and I want to find a way to combine them manually and make a new clip with the external H5 audio and C300 video instead of just dragging and dropping them on the timeline- I want to make them one clip.

Let me know if you can help, I couldn't find anything online other than how to sync external audio by matching wavelengths from on-camera audio.

[shooternz]

Export them to a movie file once you have them synched.

[anthohknee]

I don't want to export them.  I want to combine the files as one audio/video clip that I can work with in my timeline.

[shooternz]

I told you how to do that. Export a DI

You dont want to merge or link so..!!!!

[Thwack Digit]

Huh? He asked if someone knows a way to sync and you said "Once you have synced"... So I am not understanding you either.

[premieregal]

Hey There - If there is no on-camera sound in this situation, you're going to have to sync manually until it "looks synced" in your Program window. I try and lip sync in these situations or find a match on visual action to the audio. To move frame by frame to match the syncing as best you can hold the alt/option keys and use the bracket arrows on your keyboard to move left and right. I show you how to sync manually here in this tutorial:

[Peferling]

To add, make sure that the frame rates of the audio and video are a match or you'll get drift.  In which case, you'll want to re-render the audio to match the rate of the video, (also look out for variable bit rate vs constant bit rates).  Then sync within a matching sequence.

[Thwack Digit]

Can you please tell me how to check the frame rate for audio as its not showing in properties and where to see VBR, Thanks

[Peferling]

There are tools on video help dot com.  However, if the audio file seems to drift at intervals, forcing you to cut it again and again and re-sync.  That is the issue.  Then take the entire audio piece and render it out to a constant bit rate, one that matches the video and re-sync.

As a general rule, I re-render the audio to match the rate of the video before I bring it in to the project bin.

[neil wilkes]

Use a Clapperboard.

[Thwack Digit]

It seems there is no clapper sound on his video as he said he has static. I just saw this now because I also have failed audio on a video clip and external audio only. I plan to sync it by eye (manually).

[brian704]

If you have a clapper you can sync manually. Once they are in sync you can either group them by selecting both audio and video, right clicking and selecting "group". You could also just use that sequence as a nest in a new comp, but I don't think you can get audio waveforms doing that.

[Thwack Digit]

Thanks for the helpful insight. Sorry for the long delays I am overseas. I do have audio on a second camera which I have merged with my zoom recording and I was thinking about trying to line the two videos up by adjusting the opacity to sort of superimpose. And try to sync that way.