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TOPIC: Audio slower than video (full MediaInfo and system spec)

Audio slower than video (full MediaInfo and system spec) 11 months, 1 week ago #159081

  • SonyAmateur
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  • Posts: 3
  • 11 months, 1 week ago
Hello Hello,

I'm a new user of Lightworks and like many before me I'm experiencing issues with the audio being slower than the video. In my situation, it is only a tad slower (perhaps less than half a second). I've seen a fair few posts which describe this problem. The answers provided, however, do not seem to address my situation.

I take video with a Sony Alpha 5000 camera. I have a fixed framerate of 25 and 48.0 kHz. Not having these numbers seem to be the most prevalent reason for why the audio is slower than the video. Hence, I am not sure what it could be.

General
ID : 0 (0x0)
Complete name : C:\Users\Henrik\Videos\Witoca\00248.MTS
CompleteName_Last : C:\Users\Henrik\Videos\Witoca\00300.MTS
Format : BDAV
Format/Info : Blu-ray Video
File size : 2.95 GiB
Duration : 27 s 562 ms
Overall bit rate mode : Variable
Overall bit rate : 919 Mb/s
Maximum Overall bit rate : 18.0 Mb/s

Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, RefFrames : 2 frames
Format settings, GOP : M=2, N=13
Codec ID : 27
Duration : 27 s 480 ms
Bit rate mode : Variable
Bit rate : 883 Mb/s
Maximum bit rate : 16.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan type, store method : Separated fields
Scan order : Top Field First
Bits/(Pixel*Frame) : 17.024
Stream size : 2.82 GiB (96%)

Audio
ID : 4352 (0x1100)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Format settings, Endianness : Big
Codec ID : 129
Duration : 27 s 584 ms
Bit rate mode : Constant
Bit rate : 256 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : -80 ms
Stream size : 862 KiB (0%)
Service kind : Complete Main

Text
ID : 4608 (0x1200)
Menu ID : 1 (0x1)
Format : PGS
Codec ID : 144
Duration : 26 s 975 ms
Delay relative to video : -80 ms

My system specs are:

OS Name Microsoft Windows 10 Home
Version 10.0.15063 Build 15063
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Manufacturer ASUSTeK COMPUTER INC.
System Model K401LB
System Type x64-based PC
System SKU ASUS-NotebookSKU
Processor Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz, 2394 Mhz, 2 Core(s), 4 Logical Processor(s)
Installed Physical Memory (RAM) 8.00 GB

Any help would be appreciated..!

Re: Audio slower than video (full MediaInfo and system spec) 11 months, 1 week ago #159083

  • hugly
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  • 11 months, 1 week ago
Hello and welcome!

First of all thanks for the mediainfo and your computer details.

Allow some additional questions:

1. Is audio delayed (or advanced) compared to video by a certain constant amount (offset) all over the duration?
2. Or, does audio drift (delay or advance increase when playing forward)?
3. Or, is audio sometime advanced and sometimes delayed?
4. Is this phenomenon only noticeable in preview when playing your media in Lightworks, or also in the exported files (using a normal media player)?
5. Do you use any separately recorded (and imported) audio-only?
6. Is the phenomenon noticeable (and identical) in all chunks of your video material?
It's better to travel well than to arrive...

Re: Audio slower than video (full MediaInfo and system spec) 11 months, 1 week ago #159089

  • SonyAmateur
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  • 11 months, 1 week ago
Thank you, Hugly!

1,2 3. The audio is always delayed, it is never advanced. From what I can make out, it seems to be delayed by a fixed, constant amount through out the whole duration. This I judge only by my own hearing, however. Is there a more accurate way of assessing this?
4. It is only noticeable when I preview imported videos in Lightworks. When I play them on a normal media player, it is synced.
5. The audio belongs to the video.
6. The phenomenon is noticeable and it does indeed seem identical in all chunks of the video material.

Re: Audio slower than video (full MediaInfo and system spec) 11 months, 1 week ago #159095

  • hugly
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  • Posts: 15185
  • 11 months, 1 week ago
Thanks that sound like latency in that audio chain. For further details, please see: www.lwks.com/index.php?option=com_kunena&func=view&catid=8&id=130612&Itemid=81#146742

As long as you do not use externally recoded audio only, you can simply ignore that delay.

It might possible to minimize latency in the audio chain by using edit-friendly video formats. Overall editing performance will be increased anyway. If you wish trying, here you'll find a suitable procedure: www.lwks.com/index.php?option=com_kunena&func=view&catid=6&id=118956&limit=15&limitstart=15&Itemid=81#119003
It's better to travel well than to arrive...
Last Edit: 11 months, 1 week ago by hugly.

Re: Audio slower than video (full MediaInfo and system spec) 11 months, 1 week ago #159107

  • SonyAmateur
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  • Fresh Boarder
  • Posts: 3
  • 11 months, 1 week ago
Ah, fair enough. Cheers for the swift and helpful feedback! If the sound is still delayed after exporting the video, I'll come back. Though let's hope I won't need to! Thanks again!
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