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TOPIC: IMPORTING MOV - MP4 FILES ( audio out of synch)

IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 4 days ago #214023

  • LOUKA181
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Hello,
Just imported *.MOV files from my CANON 6D ,(set at 1920x1080 at 30fps)
IF I play those files with Quick Time all is good,
but if I import these *. MOV file into LWKS (v14) audio is out of synch
with video by about 2 sec.
I converted my MOV files to MP4 and I still have the same problem:

the file info is listed below: (using MEDIAINFO)
what is the procedure to fix this ??

tx FOR YOUR HELP !!
DAN

----------------------

General
Complete name : E:\DAN-VIDEO\CHAN-CREATION\¬ęPromo-VCLIP-14032020\MVI_2767.MOV
Format : MPEG-4
Format profile : QuickTime
Codec ID : qt 2007.09 (qt /CAEP)
File size : 863 MiB
Duration : 1 min 21 s
Overall bit rate mode : Variable
Overall bit rate : 88.7 Mb/s
Encoded date : UTC 2020-03-14 17:33:54
Tagged date : UTC 2020-03-14 17:33:54
Copyright : C 2016
com.apple.quicktime.make : Canon
com.apple.quicktime.model : Canon EOS 6D
com.apple.quicktime.author : DAN SEG PHOTO

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, Reference frames : 1 frame
Format settings, GOP : N=1
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1 min 21 s
Bit rate mode : Variable
Bit rate : 87.2 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 1.402
Stream size : 848 MiB (98%)
Language : English
Encoded date : UTC 2020-03-14 17:33:54
Tagged date : UTC 2020-03-14 17:33:54
Color range : Full
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC

Audio
ID : 2
Format : PCM
Format settings : Little / Signed
Codec ID : sowt
Duration : 1 min 21 s
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 14.9 MiB (2%)
Language : English
Encoded date : UTC 2020-03-14 17:33:54
Tagged date : UTC 2020-03-14 17:33:54

Other
ID : 3
Type : Time code
Format : QuickTime TC
Duration : 1 min 21 s
Bit rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Time code of first frame : 03:01:08;27
Time code, striped : Yes
Language : English
Encoded date : UTC 2020-03-14 17:33:54
Tagged date : UTC 2020-03-14 17:33:54



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Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 4 days ago #214024

  • briandrys
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It may be worth testing with the Pre-ingest setting. This is found on P214 of the V14.5 User Guide, which can be downloaded in documentation.

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 4 days ago #214030

  • LOUKA181
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  • 3 weeks, 4 days ago
tx but P214 OF THE USER Manual has only 2 choice for INGEST: 30 fps and 29.27fps to IMPORT I still see an OFFSET,
If I manually re-synch audio by trimming AUDIO TRACK only I get -10fps offset,


ALso, once my Project is completed:
I get even worst AUDIO out of synch at the EXPORT file . (1080p- *. mp4 format)
I have no clue what is the setting required to properly EXPORT my Project,

I also found an Utility called ---Handbrake-- to transcode: and set
the file to CONSTANT FRAMERATE. which help for better synch before I import files:

Also I re-IMPORTED the full project BACK into LIGHTWORKS and in preview averything is back in synch,,,


any help is appreciated,

DAN
Last Edit: 3 weeks, 3 days ago by LOUKA181.

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 3 days ago #214040

  • David Rasberry
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There are two settings under pre-inges sync in the import menu: one to match your video frame rate, and one to match timecode, i.e drop frame or non drop frame.
For the NTSC framerate(29.97 or 23.98)offsets TC reference should be set to drop frame. Your video does have 29.97 referenced timecode.
Depending on your computer, there may be clocking issues between your video GPU and your onboard audio chipset that can occasionally cause issues like this. A clean computer restart before editing can help, as will not running any background apps that you don't need while editing.
Razz

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Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 3 days ago #214048

  • hugly
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Hello,

If I understand your posts correctly, you're using Lightworks V14.0, and not V14.5 or 2020, and the sound embedded in the video shown above appears to be out of sync, and not some kind of imported audio-only. The sync issue appears as a constant offset, sync is not drifting. Furthermore, I suspect that you run Mac OSX Windows 10 64-bit?

Is all this correct?
It's better to travel well than to arrive...
Last Edit: 3 weeks, 3 days ago by hugly.

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 3 days ago #214059

  • hugly
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I missed this sentence:

LOUKA181 wrote:
Also I re-IMPORTED the full project BACK into LIGHTWORKS and in preview averything is back in synch
It indicates that you are trapped by audio latency in preview, which is a known problem with Lightworks when using compressed media on low powered computers.

The fix is: Don't try to correct sync issues with embedded sound in preview - the exported file will be in sync. Unfortunately this doesn't allow cutting on sound.

Upgrading to V14.5, or even the latest 2020 beta, may also show some improvement, same as using internal proxies.
It's better to travel well than to arrive...
Last Edit: 3 weeks, 3 days ago by hugly.

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 3 days ago #214061

  • LOUKA181
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tx for the Highlite:
After many hours of testing and going nuts : I can conclude that its a LWKS bug in the preview process.

I imported many file types: MOV, pm4, pm3 AVI, and you name-it:
they all show OFF Synch. throing me OFF thinking my files are incorrect. VERY Frustrating after PAYING for this PRO-package and the advertisement that this is an advance Pro- Software.

I re-did all TEST with --Windows Movie MAker-- that cost ZERO and have zero issues ! Imagine that !

ALL source files (Video-clip with dialogues) are all in Synch using separate players: VLC, Windows Media Player, QuiK time ..

most files are MOV file are 30fps but actually (29.97 fps) from my CANON 6D , ( which may be Variable Frame rate)

ONLY when importing them into LWK in the preview they appear out-of-synch. it makes it difficult if perfect music, sound effects , dialog needs to be perfect synch.

but after EXPORTING, this issue is gone ! all good,

I saw article to re-synch source files using HandBrake to select CONSTANT FRAMERATE,
that did improve my source files but still not perfect synch.


MY SYSTEM IS:
WIN-10 running on Intel -I7 with 16G RAM, with GTX560 GE Force Video card , all this with a new ASUS mother board,
I have LWKS V14.5-PRO installed,


DAN

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 3 days ago #214062

  • LOUKA181
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see my post 214061 below:

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 3 days ago #214063

  • LOUKA181
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I did, zero change see my post 214061
tx

DS

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 2 days ago #214067

  • hugly
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The Canon 6D, same as all Canon DSLRs I'm aware of, create constant frame rates when recording. It doesn't make sense to use Handbrake to correct for variable frame rate, because it doesn't exist.

From your profile I see that you are member of this forum for quite a while and I assume that this is not the first time you're editing with Lightworks. I wonder, what has changed in your workflow/configuration that the problem appears now, but not earlier?
It's better to travel well than to arrive...

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 2 days ago #214069

  • LOUKA181
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The Canon 6D, same as all Canon DSLRs I'm aware of, create constant frame rates when recording. It doesn't make sense to use Handbrake to correct for variable frame rate, because it doesn't exist.

-- tx for feedback:
I red many articles on this procedure, but noticed that my latest
MOV-- file this does not not improve anything.
I wont use this anymore now that I suspect LWKS preview sequence
being the problem.. (LWKS Bug)


From your profile I see that you are member of this forum for quite a while and I assume that this is not the first time you're editing with Lightworks. I wonder, what has changed in your workflow/configuration that the problem appears now, but not earlier?

--- 3 reasons I see here:

a) I updated to V14.5 recently (PRO)

b) I upgraded my PC for that reason with INtel- I7 and new ASUS
mother board. still have 16G of RAM.

c) Most of my previous work did not require precise SYNCH.,
but now it does specially with many dialogs.
I compensated my hwole dialog rack with -10frames (250ms) to synch
in preview to verify correct editing.
But I found out later that this even increased the problem in
EXPORT. the resulted mp4 file was terrible..
its very hard to work and see perfect synch in preview and than
get out- of synch in EXPORTED files (mp4)..

I still wonder what is the real fix for this ? (in LWKS)

I used VLC player to view my final exported mp4 file and
used the -K- and -J- keys to shift audio track with
about 250ms delay or negative delay to determine about 10frames
offset. than I whent back into LWKS and apply this to my complete
dialog track.
But all this is not normal, LWKS should provide the correct
synch in preview or TimeLIne.



tx for your feedback ..

DAN

Re: IMPORTING MOV - MP4 FILES ( audio out of synch) 3 weeks, 2 days ago #214074

  • hugly
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250 ms delay in a 30 fps project with 30 fps material would be 7.5 frames. Nevertheless, from a practical point of view more than 2 frames at 30 fps are too much when cutting on sound.

The best bet you have for reducing preview delay is converting the material to something less demanding. A simple way which preserves export quality is the internal proxy workflow:

www.lwks.com/index.php?option=com_kunena&func=view&catid=217&id=194770&Itemid=81#194787

Give it try and see what happens.
It's better to travel well than to arrive...
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