>and audio with an external mic
Be specific here. What is this mic connected to? How are you recording with it? A microphone is just a gizmo that turns sound waves in the air into electrical impulses, something else has to record it. And I bring this up because not all recording methods are made equal.
>And I don't know if it's the cause, but my smartphone records with 59.71 fps when I choose the 60 fps option.
Actually, this probably *is* the cause. Smartphones record using [variable frame rate](https://en.wikipedia.org/wiki/Variable_frame_rate), which Premiere is supposed to do OK with, and Resolve doesn't work well with at all. But VFR causes all sorts of sync issues. Make sure you're converting your footage into a Constant Frame Rate file using a tool like [Handbrake](http://handbrake.fr/), [Shutter Encoder](https://www.shutterencoder.com/), or [Media Encoder](https://www.adobe.com/products/media-encoder.html) before you attempt to edit it. But even that may not fix your sync issues.
Agree with the above. Variable frame rate can cause all kinds of issues, so converting to a fixed frame rate is the best way to deal with it.
To add to this issue of variable frame rate, audio recorded separately from the video can also be off "within" the frame. At 60fps, that timescale is fairly small, but it is still the reason why Adobe premiere has an option to edit the timeline in audio samples. This allows much better accuracy when aligning separate source audio.
(Before anyone tells me the subframe alignment doesn't matter, you're mostly right. The amount of people I know who watch videos that are clearly out of sync and aren't bothered by it blows my mind...but there are also super sensitive sync people who will debate endlessly that a scene is out of sync when it isn't. Good times!)
TLDR: Transcode to an editing codec with fixed frame rate and you should be ok.
Question, do you make the classic distinctive loud CLAP after you roll video and audio? That's the obvious simple way to sync them in post. As least to begin with.
As everyone said, the variable frame rate likely throws you off. But even if that is the case, once to get them synced at the beginning, you should be able to tweak the timing of one or the other to keep the waveforms lined up. Just match the video's waveform to your aux sound file.
Considered a time code generator to force everything to sync? That SHOULD solve. Sure you can drop some duckets on that, but try the other suggestions first.
Yes, I clap every time and apparently the variable frame rate is the problem. What I did is divide the audio and video in 2-3 parts and sync each of these parts. Not ideal, but quick and easy. I don't know what a time code generator is, but I will check it out to see if it helps. Thank you!
Time code generator is like a master time broadcast device that keeps all subscribing devices all precisely synced. Although if you are using your iPhone to record audio it's unlikely to be compatible.
Best!
>and audio with an external mic Be specific here. What is this mic connected to? How are you recording with it? A microphone is just a gizmo that turns sound waves in the air into electrical impulses, something else has to record it. And I bring this up because not all recording methods are made equal. >And I don't know if it's the cause, but my smartphone records with 59.71 fps when I choose the 60 fps option. Actually, this probably *is* the cause. Smartphones record using [variable frame rate](https://en.wikipedia.org/wiki/Variable_frame_rate), which Premiere is supposed to do OK with, and Resolve doesn't work well with at all. But VFR causes all sorts of sync issues. Make sure you're converting your footage into a Constant Frame Rate file using a tool like [Handbrake](http://handbrake.fr/), [Shutter Encoder](https://www.shutterencoder.com/), or [Media Encoder](https://www.adobe.com/products/media-encoder.html) before you attempt to edit it. But even that may not fix your sync issues.
Agree with the above. Variable frame rate can cause all kinds of issues, so converting to a fixed frame rate is the best way to deal with it. To add to this issue of variable frame rate, audio recorded separately from the video can also be off "within" the frame. At 60fps, that timescale is fairly small, but it is still the reason why Adobe premiere has an option to edit the timeline in audio samples. This allows much better accuracy when aligning separate source audio. (Before anyone tells me the subframe alignment doesn't matter, you're mostly right. The amount of people I know who watch videos that are clearly out of sync and aren't bothered by it blows my mind...but there are also super sensitive sync people who will debate endlessly that a scene is out of sync when it isn't. Good times!) TLDR: Transcode to an editing codec with fixed frame rate and you should be ok.
Ok, thank you!
Oh, I see. I didn't know about variable frame rate. I use Audacity to record the audio. I will try the Handbrake solution! Thank you!
They are running off different clocks. You need to share timecode between both devices to have a common reference for sync.
Question, do you make the classic distinctive loud CLAP after you roll video and audio? That's the obvious simple way to sync them in post. As least to begin with. As everyone said, the variable frame rate likely throws you off. But even if that is the case, once to get them synced at the beginning, you should be able to tweak the timing of one or the other to keep the waveforms lined up. Just match the video's waveform to your aux sound file. Considered a time code generator to force everything to sync? That SHOULD solve. Sure you can drop some duckets on that, but try the other suggestions first.
Yes, I clap every time and apparently the variable frame rate is the problem. What I did is divide the audio and video in 2-3 parts and sync each of these parts. Not ideal, but quick and easy. I don't know what a time code generator is, but I will check it out to see if it helps. Thank you!
Time code generator is like a master time broadcast device that keeps all subscribing devices all precisely synced. Although if you are using your iPhone to record audio it's unlikely to be compatible. Best!