Vegas Pro 22: Audio Drifting for HDV 1080i Footage

rtbond wrote on 12/17/2024, 7:05 PM

Hello,

I discovered that the audio track begins to lag the video track for HDV 1080i footage in VP22, but not in VP21. The HDV track's A/V sync is fine with a VLC playback, so this seems this is specific to VP22 (Build 194). While in VP22 the A/V sync is good at the start of the track, but 9 minutes into the timeline the audio is lagging the video by 20 frames. This gets progressively worse as you go deeper into timeline.

I tried three different HDV 1080i source files and they all are experiencing the same loss of A/V sync (but only in VP22 and not in VP21). The MediaInfo details for one of these HDV 1080i files is below

Any suggestions, other than reverting back to VP21 to these HDV tracks?

HDV 1080i Track Details

======================

General
ID : 255 (0xFF)
Complete name : E:\Capture\2009_May_to_Aug_Tape-21.m2t
Format : MPEG-TS
Commercial name : HDV 1080i
File size : 10.5 GiB
Duration : 57 min 27 s
Start time : UTC 165-25-45 45:85:85
End time : UTC 165-25-45 45:85:85
Overall bit rate mode : Constant
Overall bit rate : 26.2 Mb/s
Maximum Overall bit rate : 33.0 Mb/s
Frame rate : 29.970 FPS
Encoded date : UTC 165-25-45 45:85:85

Video
ID : 2064 (0x810)
Menu ID : 100 (0x64)
Format : MPEG Video
Commercial name : HDV 1080i
Format version : Version 2
Format profile : Main@High 1440
Format settings : CustomMatrix / BVOP
Format settings, BVOP : Yes
Format settings, Matrix : Custom
Format settings, GOP : M=3, N=15
Format settings, picture structure : Frame
Codec ID : 2
Duration : 57 min 26 s
Bit rate mode : Constant
Bit rate : 24.5 Mb/s
Maximum bit rate : 25.0 Mb/s
Width : 1 440 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 29.970 (30000/1001) FPS
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.526
Time code of first frame : 00:00:00:00
Time code source : Group of pictures header
GOP, Open/Closed : Open
GOP, Open/Closed of first frame : Closed
Stream size : 9.84 GiB (94%)
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2068 (0x814)
Menu ID : 100 (0x64)
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 2
Codec ID : 3
Duration : 57 min 26 s
Bit rate mode : Constant
Bit rate : 384 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Frame rate : 41.667 FPS (1152 SPF)
Compression mode : Lossy
Stream size : 158 MiB (1%)

Menu
ID : 129 (0x81)
Menu ID : 100 (0x64)
Format : MPEG Video / MPEG Audio / /
List : 2064 (0x810) (MPEG Video) / 2068 (0x814) (MPEG Audio) / 2069 (0x815) () / 2065 (0x811) ()
Maximum bit rate : 26200800

Comments

RogerS wrote on 12/17/2024, 7:48 PM

Could we get a sample for testing (upload to Google Drive, etc.?)

There seem to be multiple decoding issues with legacy footage and 22 at the moment. (see the video section of this forum as well).

rtbond wrote on 12/18/2024, 7:17 AM

@RogerS HERE is a link to a 10-min HDV 1080i clip (I used FFMPEG to extract this sample from the full clip). When you place this clip on the VP22 timeline there is a scene transition at about the 9:06 mark from a noisy gymnasium to a quiet scene with a dog-on-a-deck. About 20 frames worth of audio from the noisy gymnasium spills into the dog-on-a-deck scene. As noted above, I do not see the behavior on VP21 or during VLC playback. The longer the clip, the more the audio lags the video.

RogerS wrote on 12/18/2024, 7:26 AM

@rtbond Thank you so much, this is invaluable. Let me download and take a look.

rtbond wrote on 12/19/2024, 11:14 AM

FYI, I opened a trouble ticket on this issue.

Former user wrote on 12/19/2024, 7:08 PM

VP20 plays correctly, VP22 doesn't.

rtbond wrote on 12/19/2024, 7:40 PM

@Former user Thanks for confirming that this seems to be a VP22-specific problem. I have reverted back to VP21 for the purposes of my HDV-based projects.

RogerS wrote on 12/20/2024, 1:45 AM

@rtbond I confirmed and reported it as well. Very easy to understand sample, thanks.

rtbond wrote on 12/20/2024, 4:32 AM

Thanks @RogerS on both counts.

rtbond wrote on 1/7/2025, 7:25 AM

I have been working with Magix support on this issue. It appears to be specific to VP22 Build 194 (the current build as of this posting). The prior build (122) works fine. If you need build 122, it is HERE.