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TOPIC: Audio is a few seconds behind the video

Audio is a few seconds behind the video 4 weeks ago #210016

I must have set something up incorrectly. When I play just one clip that I have placed on the timeline (with no editing or cuts), the audio and video are clearly not in sync. Sometimes it looks like the video is trying to catch up with the audio, so it will go a little bit faster. But my video almost looks like the sound has been dubbed into it incorrectly kind of like the translations in a foreign film.

My video amounts to little more than a vlog (it is a scam baiting video), so I have no idea how to get everything in sync. It did the same thing in preview as well, but it seems to work fine when I play it on Quicktime player.

Any ideas?

Re: Audio is a few seconds behind the video 4 weeks ago #210020

  • briandrys
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  • 4 weeks ago
Please follow the directions in this sticky. so that users can see the technical details of your video:

www.lwks.com/index.php?option=com_kunena&func=view&catid=23&id=66072&Itemid=81

Which Lightworks version are you using?

Re: Audio is a few seconds behind the video 3 weeks, 5 days ago #210043

  • keithvalenza
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  • 3 weeks, 5 days ago
It is not 14.6 (since that is a test version), so I assume it is the previous one. Here is a copy of the report:

General
Complete name : /Volumes/NO NAME/Unedited/Long refund call 12 17.mov
Format : MPEG-4
Format profile : QuickTime
Codec ID : qt 0000.00 (qt )
File size : 1.74 GiB
Duration : 23mn 25s
Overall bit rate mode : Variable
Overall bit rate : 10.6 Mbps
Encoded date : UTC 2019-12-17 21:14:15
Tagged date : UTC 2019-12-17 21:15:18
Writing library : Apple QuickTime
com.apple.quicktime.make : Apple
com.apple.quicktime.model : MacBookAir6,1
com.apple.quicktime.software : Mac OS X 10.15.2 (19C57)
com.apple.quicktime.creationdate : 2019-12-17T14:52:47-0500

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.2
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Format settings, GOP : M=2, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 23mn 25s
Source duration : 23mn 25s
Bit rate mode : Variable
Bit rate : 10.5 Mbps
Maximum bit rate : 768 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 27.825 fps
Minimum frame rate : 0.950 fps
Maximum frame rate : 33.333 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.410
Stream size : 1.72 GiB (99%)
Source stream size : 1.72 GiB (99%)
Title : Core Media Video
Encoded date : UTC 2019-12-17 21:14:15
Tagged date : UTC 2019-12-17 21:15:18
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.601
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 23mn 25s
Source duration : 23mn 25s
Bit rate mode : Constant
Bit rate : 96.0 Kbps
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 16.0 KHz
Frame rate : 15.625 fps (1024 SPF)
Compression mode : Lossy
Stream size : 16.4 MiB (1%)
Source stream size : 16.4 MiB (1%)
Title : Core Media Audio
Encoded date : UTC 2019-12-17 21:14:15
Tagged date : UTC 2019-12-17 21:15:18

Re: Audio is a few seconds behind the video 3 weeks, 5 days ago #210045

  • khaver
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  • 3 weeks, 5 days ago
The problem appears to be the extreme variable frame rate. Though Lightworks can work with variable frame rate clips, the extreme variance may be too much for it. It would be best to convert the clip to a fixed frame rate of 29.97fps using Handbrake or Eyeframe Converter.
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Re: Audio is a few seconds behind the video 3 weeks, 5 days ago #210057

  • hugly
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  • 3 weeks, 5 days ago
From Mediainfo above:
Frame rate : 27.825 fps
27.825 fps is a non standard frame rate which isn't properly supported at all, variable frame rate mode or not. 27.825 fps will lead to sound drifting out of sync. Unfortunately, Lightworks imports something like this without any warning.

For information on converting with the apps suggested by khaver, please see:

Eyeframe Converter: www.lwks.com/index.php?option=com_kunena&func=view&catid=6&id=118956&limit=15&limitstart=15&Itemid=81#119003

Handbrake: www.lwks.com/index.php?option=com_kunena&func=view&catid=23&id=166802&Itemid=81#209009

For both, make sure that the frame rate is set to 30 fps, prior to starting the conversion.
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Last Edit: 3 weeks, 5 days ago by hugly.
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