@Precise and "B" and "C" from this POST. No one has any idea of what footage you are using, what your computer specs are. And even if you tried going back to the previous build, which you can do by downloading from this POST.

And it would be good to also provide (as I wrote in my previous reply to you) a sample of the problematic file, uploaded to the cloud.

... give us clear instructions on how we can fix it

@Precise, try my quick simple fix, just follow my reply: https://www.vegascreativesoftware.info/us/forum/problem-after-updating-vegas-22-does-not-open-mp-4-mpeg-4-video-codec--147643/?page=1#ca928878

And for more detailed info that you can provide for developers as sample to check, follow @Reyfox's notes.

@Precise said: "I've been working on a very large project for months and when I updated to B194 all my MP4 videos disappeared, and I can't get them reinstalled."

... and you didn't do a backup of your system image before you loaded an update to your software.

Macrium Reflect

Aomei Backupper

Shame! Shame! Shame on you!

@Precise I wouldn't feel ashamed as I suspect very few of us mortals go to John's extent of doing system image backups. Maybe System Restore.

Seriously though it's best not to update when in the middle of a project just in case you run unto problems....

Have you tried @set's suggestion? If it doesn't work for you then as a temporary solution to finish your project you could uninstall VP22 Build 194 then install the original build 93 followed by the 122 patch.

Yes! This method helped me too! Now everything is opening! Thanks a lot!

@Allariel, thank you for providing the Bandicam recorded sample. I'm sure this is similar to @Nikita-Nikita's

I can confirm by default only able to load audio, because it is decoded using newer mxcompoundplug.dll

After going to Options>Preferences>File I/O > and turn on 'Enable legacy AVC decoding', VP22 can open the media again using legacy so4compoundplug.dll decoder.

Use this alternative workflow temporarily for now in VP22b194.

Keep the media for sometimes so that I can also forward the sample to developers.

 

Mediainfo data:

General
Complete name                            : E:\VEGAS Pro Experiments\20241111 Bandicam\bandicam 2024-11-09 17-35-03-020.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (mp41)
File size                                : 167 MiB
Duration                                 : 1 min 58 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 11.8 Mb/s
Frame rate                               : 45.612 FPS
Encoded date                             : 2024-11-09 15:35:03 UTC
Tagged date                              : 2024-11-09 15:35:03 UTC
Writing application                      : Bandicam 7.1.4.2458 / GDI(Enhanced 1)

Video
ID                                       : 1
Format                                   : MPEG-4 Visual
Format profile                           : Simple@L1
Format settings                          : BVOP
Format settings, BVOP                    : Yes
Format settings, QPel                    : No
Format settings, GMC                     : No warppoints
Format settings, Matrix                  : Default (H.263)
Codec ID                                 : mp4v-20
Duration                                 : 1 min 58 s
Bit rate mode                            : Variable
Bit rate                                 : 11.6 Mb/s
Maximum bit rate                         : 936 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 012 pixels
Display aspect ratio                     : 1.909
Frame rate mode                          : Variable
Frame rate                               : 45.612 FPS
Minimum frame rate                       : 3.333 FPS
Maximum frame rate                       : 60.060 FPS
Original frame rate                      : 60.000 FPS
Color space                              : YUV
Bit depth                                : 8 bits
Scan type                                : Progressive
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.033
Stream size                              : 164 MiB (98%)
Language                                 : English
Encoded date                             : 2024-11-09 15:35:03 UTC
Tagged date                              : 2024-11-09 15:35:03 UTC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 1 min 58 s
Duration_LastFrame                       : -2 ms
Bit rate mode                            : Variable
Bit rate                                 : 192 kb/s
Maximum bit rate                         : 265 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                              : 2.72 MiB (2%)
Language                                 : English
Encoded date                             : 2024-11-09 15:35:03 UTC
Tagged date                              : 2024-11-09 15:35:03 UTC