Audio out of sync for some files

I-Mac wrote on 2/3/2026, 10:17 PM

I am having an issue with a few of the files (not all) I imported for an edit - where they will at sudden points have then audio and video become out of sync in the video clipper as well as being stand alone in a project. I doubled checked the mp4 file source they come from and they play without any issue on every media player Windows has so feel safe to say its not an issue with the original files. I've also tried making sure the frame rate for the videos and the project are the same, and tried re-importing the files to see if it was some kind of error originally but neither helped. I am using Vegas pro 23 that is completely up to date on updates as per the update search option (on Windows 11 also completely up to date)

Any help would be greatly appreciated as I'm losing my mind trying to manually sync intricate audio/videos for every clip I want to add in. This is killing my OCD!

Comments

john_dennis wrote on 2/4/2026, 1:18 AM

@I-Mac We need information about the files that you are using. Use this FAQ.

(FAQ) How to post MediaInfo and VEGAS Pro File Properties

I-Mac wrote on 2/4/2026, 6:20 AM 
General
Complete name                            : C:\Users\svugi\Downloads\Watch Heated Rivalry S1E6.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 592 MiB
Duration                                 : 51 min 50 s
Overall bit rate                         : 1 597 kb/s
Frame rate                               : 23.927 FPS
Writing application                      : Lavf61.7.100

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L5
Format settings                          : CABAC / 5 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 5 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 51 min 50 s
Source duration                          : 51 min 50 s
Bit rate                                 : 1 273 kb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 23.927 FPS
Minimum frame rate                       : 0.157 FPS
Maximum frame rate                       : 23.981 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.026
Stream size                              : 472 MiB (80%)
Source stream size                       : 472 MiB (80%)
Writing library                          : x264 core 157 r2980 34c06d1
Encoding settings                        : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=24 / lookahead_threads=4 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=25.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 51 min 50 s
Bit rate mode                            : Constant
Bit rate                                 : 317 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 118 MiB (20%)
Default                                  : Yes
Alternate group                          : 1

Text #1
ID                                       : 1-CC1
Format                                   : EIA-608
Muxing mode                              : SCTE 128 / DTVCC Transport
Muxing mode, more info                   : Muxed in Video #1
Duration                                 : 51 min 50 s
Start time                               : 5124095 h
Bit rate mode                            : Constant
Stream size                              : 0.00 Byte (0%)
Count of frames before first event       : 29
Type of the first event                  : PopOn

Text #2
ID                                       : 1-CC3
Format                                   : EIA-608
Muxing mode                              : SCTE 128 / DTVCC Transport
Muxing mode, more info                   : Muxed in Video #1
Duration                                 : 51 min 50 s
Start time                               : 5124095 h
Bit rate mode                            : Constant
Stream size                              : 0.00 Byte (0%)
Count of frames before first event       : 41
Type of the first event                  : PopOn


General
  Name: Watch Heated Rivalry S1E6.mp4
  Folder: C:\Users\svugi\Downloads
  Type: ISO Base
  Size: 606.35 MB (620,905,687 bytes)
  Created: Friday, January 30, 2026, 10:14:23 PM
  Modified: Friday, January 30, 2026, 10:14:24 PM
  Accessed: Wednesday, February 4, 2026, 7:12:02 AM
  Attributes: Archive

Media information
  Stream format: MPEG-4
  Video stream #1
    Video format: AVC
    Resolution: 1920 x 1080 px
    Aspect ratio: 16:9
    Color depth: 8 bit
    Frame rate: 23.927 fps
    Scan type: Progressive
    Bit rate: 1273009 bps
  Audio stream #1
    Audio format: AAC
    Sampling rate: 48000 Hz
    Channels: 2 channels
    Bit rate mode: Constant
    Bit rate: 317466 bps

Streams
  Video: 00:51:50.833, 24.000 fps progressive, 1920x1080x32, AVC
  Audio: 00:51:44.533, 48000 Hz, 16 Bits, Stereo, AAC

ACID information
  ACID chunk: no
  Stretch chunk: no
  Stretch list: no
  Stretch info2: no
  Beat markers: no
  Detected beats: no

Other metadata
  Regions/markers: no
  Command markers: no

Media manager
  Media tags: no

Plug-In
  Name: mxcompoundplug.dll
  Folder: C:\Program Files\VEGAS\VEGAS Pro 23.0\FileIO Plug-Ins\mxcompoundplug
  Format: MAGIX AVC
  Version: Version 23.0 (Build 302)
  Company: MAGIX Computer Products Intl. Co.

This is the info for one of the 2 files in question.

@I-Mac We need information about the files that you are using. Use this FAQ.

(FAQ) How to post MediaInfo and VEGAS Pro File Properties

 

Dexcon wrote on 2/4/2026, 6:43 AM

Thank you for uploading the MediaInfo report. I can't be sure but the variable frame rate of the video varies from an incredibly low 0.157 fps (I've never seen such a low frame rate before) to 23.927 fps - maybe the huge dive in fps is the point where the audio loses sync with the video.

Try transcoding the media from Variable Frame Rate (VFR) to Constant Frame Rate (CFR) in a free transcoder such as Handbrake or Shutter Encoder and see if that solves the sync problem. Or you could also transcode to CFR within Vegas Pro 23 by rendering the VFR media via an H.264 or H.265 (or almost any other) render template.

Cameras: Sony FDR-AX100E; GoPro Hero 11 Black Creator Edition; Samsung S23 Ultra smart phone

Installed: Vegas Pro 13, 15, 16, 17, 18, 19, 20, 21, 22 & 23, HitFilm Pro 2021.3, DaVinci Resolve Studio 20.3, BCC 2026, Mocha Pro 2026, NBFX TotalFX 7, Neat NR 6, DVD Architect 6.0, MAGIX Travel Maps, Sound Forge Pro 16, SpectraLayers Pro 12, iZotope RX11 Advanced and many other iZ plugins, Vegasaur 4.0

Windows 11 25H2

Dell Alienware Aurora 11:

10th Gen Intel i9 10900KF - 10 cores (20 threads) - 3.7 to 5.3 GHz

NVIDIA GeForce RTX 2080 SUPER 8GB GDDR6 - liquid cooled

64GB RAM - Dual Channel HyperX FURY DDR4 XMP at 3200MHz

C drive: 2TB Samsung 990 PCIe 4.0 NVMe M.2 PCIe SSD

D: drive: 4TB Samsung 870 SATA SSD (used for media for editing current projects)

E: drive: 2TB Samsung 870 SATA SSD

F: drive: 6TB WD 7200 rpm Black HDD 3.5"

Dell Ultrasharp 32" 4K Color Calibrated Monitor

 

LAPTOP:

Dell Inspiron 5310 EVO 13.3"

i5-11320H CPU

C Drive: 1TB Corsair Gen4 NVMe M.2 2230 SSD (upgraded from the original 500 GB SSD)

Monitor is 2560 x 1600 @ 60 Hz

I-Mac wrote on 2/4/2026, 5:40 PM

@Dexcon Thanks for the suggestion. I'm trying to render it now with the INTERNET HD 25 FPS (Intel) template - hopefully that fixes things. I'll let you know how it goes and perhaps be back to pick your brain.

I-Mac wrote on 2/4/2026, 6:47 PM

 

@Dexcon @john_dennis Unfortunately that didn't fix the issue and it still seems to get desynchronized at the same time as before the rendering. I'll put the specs of the rendered template underneath if that helps.

General
Complete name                            : C:\Users\svugi\Downloads\HR1.6test.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp42)
File size                                : 4.26 GiB
Duration                                 : 51 min 50 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 11.8 Mb/s
Frame rate                               : 25.000 FPS
Encoded date                             : 2026-02-04 23:35:33 UTC
Tagged date                              : 2026-02-04 23:35:33 UTC

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L4@High
Codec ID                                 : hvc1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 51 min 50 s
Bit rate                                 : 11.6 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Standard                                 : Component
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Bits/(Pixel*Frame)                       : 0.223
Stream size                              : 4.19 GiB (98%)
Writing library                          : HEVC Coding
Language                                 : English
Encoded date                             : 2026-02-04 23:35:34 UTC
Tagged date                              : 2026-02-04 23:35:34 UTC
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : hvcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 51 min 50 s
Bit rate mode                            : Variable
Bit rate                                 : 192 kb/s
Maximum bit rate                         : 451 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 70.2 MiB (2%)
Language                                 : English
Encoded date                             : 2026-02-04 23:35:34 UTC
Tagged date                              : 2026-02-04 23:35:34 UTC

General
  Name: HR1.6test.mp4
  Folder: C:\Users\svugi\Downloads
  Type: ISO Base
  Size: 4.46 GB (4,571,581,830 bytes)
  Created: Wednesday, February 4, 2026, 6:35:33 PM
  Modified: Wednesday, February 4, 2026, 7:33:33 PM
  Accessed: Wednesday, February 4, 2026, 7:35:27 PM
  Attributes: Archive

Media information
  Stream format: MPEG-4
  Video stream #1
    Video format: HEVC
    Resolution: 1920 x 1080 px
    Aspect ratio: 16:9
    Color depth: 8 bit
    Frame rate: 25.000 fps
    Bit rate: 11562738 bps
  Audio stream #1
    Audio format: AAC
    Sampling rate: 48000 Hz
    Channels: 2 channels
    Bit rate mode: Variable
    Bit rate: 192000 bps

Streams
  Video: 00:51:50.840, 25.000 fps progressive, 1920x1080x32, HEVC
  Audio: 00:51:50.763, 48000 Hz, 16 Bits, Stereo, AAC

ACID information
  ACID chunk: no
  Stretch chunk: no
  Stretch list: no
  Stretch info2: no
  Beat markers: no
  Detected beats: no

Other metadata
  Regions/markers: no
  Command markers: no

Media manager
  Media tags: no

Plug-In
  Name: mxcompoundplug.dll
  Folder: C:\Program Files\VEGAS\VEGAS Pro 23.0\FileIO Plug-Ins\mxcompoundplug
  Format: MAGIX HEVC
  Version: Version 23.0 (Build 302)
  Company: MAGIX Computer Products Intl. Co.

 

Gid wrote on 2/4/2026, 7:28 PM

@I-Mac Your MediaInfo says Frame rate : 23.927 FPS, & further down it says 'Streams  - Video: 00:51:50.833, 24.000 fps progressive, 1920x1080x32, AVC'.

If I was trying to recode I'd choose 24fps not 25fps. I'm not saying this is correct or it will fix your problem

Vegas Pro 18 - 22
Vegas Pro/Post 19
Boris Continuum & Sapphire, 
Silhouette Standalone + Plugin, 
Mocha Pro Standalone + Plugin, 
Boris Optics,
NewBlue TotalFX
Desktop PC Microsoft Windows 10 Pro - 64-Bit
ASUS PRO WS WRX80E-SAGE SE WIFI AMD Motherboard
AMD Ryzen Threadripper PRO 3975WX 3.5GHz 32 Core
Corsair iCUE H150i RGB PRO XT 360mm All-in-One Liquid CPU Cooler
RAM 256GB ( 8x Micron 32GB (1x 32GB) 2666MHz DDR4 RAM )
2x Western Digital Black SN850 2TB M.2-2280 SSD, 7000MB/s Read, 5100MB/s Write
(programs on one, project files on the other)
Graphics MSI GeForce RTX 3090 SUPRIM X 24GB OC GPU
ASUS ROG Thor 1200W Semi-Modular 80+ Platinum PSU 
Fractal Design Define 7 XL Dark TG Case with 3 Fans
Dell SE3223Q 31.5 Inch 4K UHD (3840x2160) Monitor, 60Hz, & an Acer 24" monitor.

At the moment my filming is done with a Samsung Galaxy S23 Ultra 5G & a GoPro Hero11 Black

I've been a Joiner/Carpenter for 40yrs, apprentice trained time served, I don't have an apprentice of my own so to share my knowledge I put videos on YouTube.

YouTube videos - https://www.youtube.com/c/Gidjoiner

 

EricLNZ wrote on 2/4/2026, 7:40 PM

Your MediaInfo says Frame rate : 23.927 FPS, & further down it says 'Streams  - Video: 00:51:50.833, 24.000 fps progressive, 1920x1080x32, AVC'.

If I was trying to recode I'd choose 24fps not 25fps. I'm not saying this is correct or it will fix your problem

Good point. But firstly I'd do what Dexcon suggested and convert the file to 24fps CFR with Shutter Encoder.

I-Mac wrote on 2/4/2026, 9:04 PM

I think I fixed the issue after what Dexcon said; once the FPS was better I could see the lag point where the audio/video desynchronized and was able to manually adjust. Now I'm going to try the same process with the other offending source video to see if it works there.