4K mp4 preview displaying super fast speed alternating still frame

Al-Korzonas wrote on 10/26/2025, 7:29 PM

I have four cameras of video from my daughter's wedding. Two are 1080p (Panasonic HDC-HS100 Camcorder and video from the church cameras), two are 4K (AKASO 7 LE and Suttie DV112 Camcorder). I'm trying to create a multi-camera video with Vegas Pro 22.0 on a 10th Gen Core i7 Windows 11 laptop with 32GB of RAM and 1TB of SSD. When I drag and drop the Suttie DV112 4K mp4 videos into Vegas, the first 30 seconds play in super high speed (probably 16x or 32x) in the preview window. Then the preview leaps forward to a still frame from about 5 minutes in and the preview displays that still frame for 11 minutes. Then, about a half minute of super high speed, followed by another still frame for minutes. The audio plays at the correct speed throughout.

When I watch the Suttie DV112 4K source videos using Microsoft Media Player, Microsoft Movies and TV, or VLC media player, they play at normal speed, both video and audio, although the video is delayed a fraction of a second from the audio. The AKASO 7 LE 4K video plays correctly in the Vegas Pro 22.0 preview window and the audio and video are in sync.

I have tried both allowing the Vegas project to match the properties of the source after I drop it in and tried first choosing HD 1080-30p (1920x1080, 29.970 fps) as the project properties, before I drop in the video, but the result with the Suttie DV112 files is the same both ways.

Hmmm... I first tried using Vegas Pro 15.0, now that I think about it, I think that both 4K camera videos played correctly in the preview window, but since I had bought Vegas Pro 22.0 several weeks ago, I uninstalled the 15.0 and installed 22.0 overnight. I was having trouble grouping the videos so I could slide them all around together, but the grouping was not working, so I decided to install the upgrade.

Second question: I was trying to downconvert the 4K camera files and render them as 1080-30p. I was hoping that those 1080p files would be smaller so that all the videos fit into Vegas at once for my multi-camera edit. However, two 4K .mp4 files totaling about 3.5GB were still about 3.5GB even when rendered and saved as a 1080-30p .mp4 file. Why is that? Shouldn't they have been nearly 1/4 the file size?

Thanks for your help.

Comments

EricLNZ wrote on 10/26/2025, 7:50 PM

File size is solely dependent on the bitrate used. Probably your 4k and 1080 files have the same bitrate, but they don't need to as the smaller 1080 files usually suffice with a lower bitrate for optimum quality. Please post media info on your 4k and 1080 files. Instructions here https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/ Alternatively if you have MPC-BE or MPC-HC players installed their File/Properties tabs give the same detailed info.

Make sure you include info on 4k files from both cameras, so we can see what the jerky/still problem might be.

Al-Korzonas wrote on 10/26/2025, 9:16 PM

I combined four 4K files from the AKASO 7 LE which totaled about 13GB in 4K and the combined 1080p file was 3.4GB, so there's something odd about the problem files from the Suttie DV112.

 

This is the Vegas File Property info from one of the AKASO 7 LE 4K files that play correctly:

General
  Name: 20220102_214133.MOV
  Folder: C:\Users\korzo\Desktop\AKASO 7 LE M&J Wedding\VIDEO
  Type: ISO Base
  Size: 3.78 GB (3,873,036,543 bytes)
  Created: Monday, October 20, 2025, 9:35:37 PM
  Modified: Sunday, January 2, 2022, 9:51:36 PM
  Accessed: Sunday, October 26, 2025, 8:49:27 PM
  Attributes: Archive

Media information
  Stream format: MPEG-4
  Video stream #1
    Video format: AVC
    Resolution: 3840 x 2160 px
    Aspect ratio: 16:9
    Color depth: 8 bit
    Frame rate: 30.000 fps
    Scan type: Progressive
    Bit rate: 49971984 bps
  Audio stream #1
    Audio format: PCM
    Sampling rate: 48000 Hz
    Channels: 2 channels
    Bit rate mode: Constant
    Bit rate: 1536000 bps

Streams
  Video: 00:10:01.500, 30.000 fps progressive, 3840x2160x32, AVC
  Audio: 00:10:01.493, 48000 Hz, 16 Bits, Stereo, LPCM

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 22.0\FileIO Plug-Ins\mxcompoundplug
  Format: MAGIX AVC
  Version: Version 22.0 (Build 250)
  Company: MAGIX Computer Products Intl. Co.

 

Here's the MediaInfo report on the same file:

General
Complete name                            : C:\Users\korzo\Desktop\AKASO 7 LE M&J Wedding\VIDEO\20220102_214133.MOV
Format                                   : MPEG-4
Format profile                           : QuickTime
Codec ID                                 : qt   0000.00.01 (qt  /icat)
File size                                : 3.61 GiB
Duration                                 : 10 min 1 s
Overall bit rate                         : 51.5 Mb/s
Frame rate                               : 30.000 FPS
Encoded date                             : 2022-01-02 13:41:34 UTC
Tagged date                              : 2022-01-02 13:41:34 UTC

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L5.1
Format settings                          : CABAC / 2 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 2 frames
Format settings, GOP                     : M=1, N=15
Muxing mode                              : Container profile=Main@L5.1
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 10 min 1 s
Bit rate                                 : 50.0 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 30.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.201
Stream size                              : 3.50 GiB (97%)
Writing library                          : AVC Coding
Encoded date                             : 2022-01-02 13:41:34 UTC
Tagged date                              : 2022-01-02 13:41:34 UTC
Color range                              : Limited
Color primaries                          : BT.601 NTSC
colour_primaries_Original                : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.601
matrix_coefficients_Original             : BT.709
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : PCM
Format settings                          : Little / Signed
Codec ID                                 : sowt
Duration                                 : 10 min 1 s
Source duration                          : 10 min 1 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                              : 110 MiB (3%)
Source stream size                       : 110 MiB (3%)
Encoded date                             : 2022-01-02 13:41:34 UTC
Tagged date                              : 2022-01-02 13:41:34 UTC
mdhd_Duration                            : 592095

 

This is the File Properties info from one of the problematic 4K files from the Suttie DV112:

General
  Name: NORMAL00000.mp4
  Folder: C:\Users\korzo\Desktop\AC13 Camcorder M&J Wedding\video
  Type: ISO Base
  Size: 2.27 GB (2,328,716,625 bytes)
  Created: Monday, October 13, 2025, 12:26:18 AM
  Modified: Saturday, October 11, 2025, 3:17:34 PM
  Accessed: Sunday, October 26, 2025, 9:03:20 PM
  Attributes: Archive

Media information
  Stream format: MPEG-4
  Video stream #1
    Video format: AVC
    Resolution: 3840 x 2160 px
    Aspect ratio: 16:9
    Color depth: 8 bit
    Frame rate: 30.000 fps
    Scan type: Progressive
    Bit rate: 13714721 bps
  Audio stream #1
    Audio format: AAC
    Sampling rate: 44100 Hz
    Channels: 1 channel
    Bit rate mode: Variable
    Bit rate: 66150 bps

Streams
  Video: 00:22:30.189, 30.019 fps progressive, 3840x2160x32, AVC
  Audio: 00:22:30.240, 44100 Hz, 16 Bits, Mono, 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 22.0\FileIO Plug-Ins\mxcompoundplug
  Format: MAGIX AVC
  Version: Version 22.0 (Build 250)
  Company: MAGIX Computer Products Intl. Co.

 

And here's the MediaInfo report on the same problematic file:

General
Complete name                            : C:\Users\korzo\Desktop\AC13 Camcorder M&J Wedding\video\NORMAL00000.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/mp41)
File size                                : 2.17 GiB
Duration                                 : 22 min 30 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 13.8 Mb/s
Frame rate                               : 30.000 FPS

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L5.1
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 1 frame
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 22 min 30 s
Source duration                          : 22 min 30 s
Bit rate                                 : 13.7 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 30.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.055
Stream size                              : 2.16 GiB (99%)
Source stream size                       : 2.16 GiB (99%)
Language                                 : English
mdhd_Duration                            : 1350219
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 22 min 30 s
Source duration                          : 22 min 30 s
Bit rate mode                            : Variable
Bit rate                                 : 66.2 kb/s
Channel(s)                               : 1 channel
Channel layout                           : M
Sampling rate                            : 44.1 kHz
Frame rate                               : 43.066 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 10.8 MiB (0%)
Source stream size                       : 10.8 MiB (0%)
Language                                 : English
mdhd_Duration                            : 1350219

 

 

Thanks!

Al.