Some cameras will just give a message and stop but most try to continue as best as possible. Slow memory cards can cause this issue, if the memory card can’t write fast enough it will inconsistently drop frames throughout the recording. It is better to you get it right in camera but it is possible to salvage old footage using something like Handbrake to reexport it. You can convert VFR footage to a constant frame rate. Unfortunately, using variable frame rates will always cause issues for sound because they don’t conform to a standard frame rate when being imported into a video editing tool. Variable frame rates are good for optimising video based on the device’s speed and storage capabilities. Shooting in a variable frame rateĪ lot of phones and tablets shoot in variable frame rates by default, although this can be changed in the settings or using 3rd party video camera apps.
Below are a few reasons why it may have happened and how to avoid it. There are lots of different reasons why your audio might be out of sync with your video.
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