A common challenge with video encoding involves the video and audio going out of sync. This can happen at the beginning of a video, or slowly over time. This issue can occur for a variety of reasons. But here are some tips for getting to a solution:
1. Make sure you're connected to a strong internet network.
If your internet speeds are slow, this can cause lag issues in the video and it may not be a problem with the video itself. You can check your internet speed at www.speedtest.net. We recommend an upload speed of at least 2Mbs.
2. Re-upload your video
Sometimes a small internet fluctuation can cause a video to upload improperly. It may be worth trying to re-upload the same file to see if this corrects the sync issue.
3. Try converting the video to a different format (.mp4, .mov, etc.)
Here are some tips when converting videos to another format on your computer,
- Set the output framerate setting to match the source file's framerate. For example: if source is 29.97 fps video, put 29.97 into the frame rate setting for output.
- Set the audio sample rate value to match the source input video's audio sample rate.
- If the audio is going out over time, or slowly loses, then corrects itself every few seconds: Set the keyframes value to a lower figure. Default is generally 300, which in 30 fps material, is one keyframe every 10 seconds. Try lowering the value to every 3 seconds, 90 frames per second.
- QuickTime sometimes has timescale issues when bringing MPEG source into Avid or Final Cut Pro. Try converting it to your native edit codec using Apple Compressor or Quicktime Player export. This should correct the A/V sync and allow you to edit the file normally.