Problem with Importing previous projects into Vegas 23

thedanktrain475 wrote on 9/12/2025, 11:11 AM

I've been using Vegas Pro 18 for years but decided to upgrade to 23 when I heard there was stability improvements. Indeed I find it to run noticeably smoother, but I'm having a strange issue I haven't seen anyone else talk about.

When I open my previous projects from VP 18 in VP 23, All the splices on my timeline are offset by just a hair, as if the whole splice has been shifted backwards relative to the media by a few frames. This basically makes my previously existing projects useless because I would have to edit every single splice to line up how it did originally. Does anyone have an answer to this?

Comments

VEGASDerek wrote on 9/12/2025, 11:49 AM

I have not see anything like this or anyone reporting this. Are your Quantize settings different in VP 18 and VP 23?

thedanktrain475 wrote on 9/12/2025, 12:30 PM

I have not see anything like this or anyone reporting this. Are your Quantize settings different in VP 18 and VP 23?

Do you mean the "Quantize to Frames" checkbox? Those are both checked in 18 and 23. Or is there another setting I should look at?

thedanktrain475 wrote on 9/12/2025, 2:59 PM

I have not see anything like this or anyone reporting this. Are your Quantize settings different in VP 18 and VP 23?

Here's an example of it happening... It's easier to hear the change than to see it. You can't even hear the rapid arpeggio in VP 23 because the media has been shifted out of the splice

RogerS wrote on 9/12/2025, 7:02 PM

Another guess is - maybe an offset issue for audio decoding? Can you share MediaInfo for the main media types in use? https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

thedanktrain475 wrote on 9/12/2025, 8:30 PM

Another guess is - maybe an offset issue for audio decoding? Can you share MediaInfo for the main media types in use? https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

You might be onto something... I just realized it's *only* the audio that gets shifted forward. The video frames still line up perfectly with each splice. But it only seems to happen when opening a VP18 project in 23. It looks like the audio behaves normally when importing the same video file to a fresh project.

Here's the media info from one of the affected clips:

General
Complete name                            : E:\videos\OBS\2025-09-12 14-50-37.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 788 KiB
Duration                                 : 17 s 518 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 368 kb/s
Frame rate                               : 29.970 FPS
Writing application                      : Lavf61.7.100Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 17 s 518 ms
Source duration                          : 17 s 417 ms
Bit rate                                 : 168 kb/s
Maximum bit rate                         : 2 500 kb/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)                       : 0.003
Stream size                              : 359 KiB (46%)
Source stream size                       : 392 KiB (50%)
Writing library                          : x264 core 164 r3106 eaa68fa
Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=18 / lookahead_threads=6 / 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=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
mdhd_Duration                            : 17518
Codec configuration box                  : avcCAudio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 17 s 366 ms
Bit rate mode                            : Variable
Bit rate                                 : 177 kb/s
Maximum bit rate                         : 192 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                              : 376 KiB (48%)
Title                                    : simple_aac_recording0
Default                                  : Yes
Alternate group                          : 1

And just in case, here's a comparison of both 18 and 23 looking at the general tab in media properties for the same clip:

Vegas Pro 18:

General
  Name: 2025-09-12 14-50-37.mp4
  Folder: E:\videos\OBS
  Type: AVC
  Size: 787.66 KB (806,562 bytes)
  Created: Friday, September 12, 2025, 2:50:38 PM
  Modified: Friday, September 12, 2025, 2:50:55 PM
  Accessed: Friday, September 12, 2025, 9:05:20 PM
  Attributes: ArchiveStreams
  Video: 00:00:17.417, 29.970 fps progressive, 1920x1080x32, AVC
  Audio: 00:00:17.321, 48,000 Hz, Stereo, AACSummary
  [TCFM]: 6ACID information
  ACID chunk: no
  Stretch chunk: no
  Stretch list: no
  Stretch info2: no
  Beat markers: no
  Detected beats: noOther metadata
  Regions/markers: no
  Command markers: noMedia manager
  Media tags: noPlug-In
  Name: so4compoundplug.dll
  Folder: C:\Program Files\VEGAS\VEGAS Pro 18.0\FileIO Plug-Ins\so4compoundplug
  Format: AVC
  Version: Version 1.0 (Build 8532)
  Company: MAGIX Computer Products Intl. Co.

Vegas Pro 23:

General
  Name: 2025-09-12 14-50-37.mp4
  Folder: E:\videos\OBS
  Type: ISO Base
  Size: 787.66 KB (806,562 bytes)
  Created: Friday, September 12, 2025, 2:50:38 PM
  Modified: Friday, September 12, 2025, 2:50:55 PM
  Accessed: Friday, September 12, 2025, 9:05:20 PM
  Attributes: ArchiveMedia 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: 29.970 fps
    Scan type: Progressive
    Bit rate: 167698 bps
  Audio stream #1
    Audio format: AAC
    Sampling rate: 48000 Hz
    Channels: 2 channels
    Bit rate mode: Variable
    Bit rate: 177191 bpsStreams
  Video: 00:00:17.417, 29.970 fps progressive, 1920x1080x32, AVC
  Audio: 00:00:17.365, 48000 Hz, 16 Bits, Stereo, AACACID information
  ACID chunk: no
  Stretch chunk: no
  Stretch list: no
  Stretch info2: no
  Beat markers: no
  Detected beats: noOther metadata
  Regions/markers: no
  Command markers: noMedia manager
  Media tags: noPlug-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 278)
  Company: MAGIX Computer Products Intl. Co.

bvideo wrote on 9/12/2025, 9:35 PM

@thedanktrain475 Possibility: Vegas had bugs around the start and end points of hevc events, depending on the particular video file, version/build, and also on your selections in the Options -> Preferences -> File I/O tab. If you were depending on those bugs in the past (your VP18), the new version might actually be slipping the video in your events, changing things by just a hair. I.e. possibly "correcting" the decoding bug.

I came across this while discussing hevc decoding in this tldr post back in July '22.

Oops never mind. Was not an audio-only bug.