No issue with Mercalli 4 on my PC with VP23.302:

I use Mercalli Pro V5 on VP22, but I have a later version installed (510 instead of 504):

Version: 5.0.510.1
Host: vegas220 [22.0.0.250]
NLE: ????
Plugin-Type: VEGAS
Status: Activated

The Mercalli V5 installers are not available on the download section of the Prodad website, so I guess you'll have to contact ProDAD support if you want an updated version.

I occasionally have the 'stabilization not applied' problem - to fix it I normally delete the FX from the video event and then apply it again. One thing I have found is that copying the Mercalli FX from one event to another doesn't work properly, so I always add it as a new FX from the Plugin Chooser for each event.

Have you tried the Mercalli V6 OFX plug-in - https://www.prodad.com/Plug-ins-for-your-editing-solution/Mercalli-OFX-DaVinci-Resolve-Magix-Vegas--108931,l-us.html It's not expensive to buy at the moment (around 35 €).

@ac6000cw

The Mercalli V5 installers are not available on the download section of the Prodad website, so I guess you'll have to contact ProDAD support if you want an updated version.

You can create an account on the ProDAD website. Register your product(s). And download updates.

My experience has been that ProDad does not provide specific version downloads like Vegas Pro does; rather, ProDad provides a product installer that will install the latest version update when run - a different installer is not required for each version update.

I have just purchased OFX for Mercalli 6 version and it works fine both during playback preview and in output video file.

I just stay with Mercalli 4 which I can use for Batch stabilization with Vegasaur, a huge time saver, instead of applying manually an Mercalli 6 OFX to each event.

@ac6000cw

The Mercalli V5 installers are not available on the download section of the Prodad website, so I guess you'll have to contact ProDAD support if you want an updated version.

You can create an account on the ProDAD website. Register your product(s). And download updates.

 

I have an account and have purchased both Mercalli V5 and V6 directly from ProDAD, but the V5 installers are not visible on the ProDAD website. Can you see the V5 installers?

My experience has been that ProDad does not provide specific version downloads like Vegas Pro does; rather, ProDad provides a product installer that will install the latest version update when run - a different installer is not required for each version update.

ProDAD updates the installers to new versions but keeps the same filename e.g. I have two versions of the Mercalli V6 OFX installer (mercalli-60-ofx64bit.exe), different file sizes, one for version 6.0.671.1, the other for 6.0.678.2. You can use something like 7-Zip to open the installer files and read the 'version.txt' file inside.

I've just tried download link in the purchase/delivery email I have for V5 - it still works and downloads the latest version of V5 (I assume).

The V5 for Vegas download URL is: http://www.prodad.de/support/mercalli/mercalli-50-vegas64bit.exe

(AFAIK the demo and full version downloads are the same).

I was not able to download latest version of Mercalli V5 OFX, that's why I decided to purchase V6 OFX.

I have another issue, but it is in Prodad Mercalli 6 SAL (Standalone version).
I tried to stabilize video file using Nvidia HEVC, but unfortunately output file has different fps than in the original file.
My original file is: 50p (fps)
but output stabilized file is: 50.087p (fps).

It only happens when I used Nvidia GPU export.
When I save file into ProRes the output fps is: 50p (the same as original fps).

Do you have the same issue?
 

I ran your file though V6 SAL (which I also have). I did nothing special in the settings, and after stabilized, using MediaInfo, I see no change in the frame rate.

Have you used NVIDIA HEVC export settings?

@Reyfox Can you answer my last question?

@Reyfox And also please reply what version of V6 SAL you have. I have:

6.0.632 64bit Standard.

What GPU do you have?

I am using an AMD GPU (Signature below) and 6.0.629 64bit

I have just tried to stabilize video file:

https://marcinzmyslowski.synology.me:444/download.php?plik=02_slub_Sony%20FX3_oryginal_002.MP4

The same I have mentioned in first post.

I got wrong frame per second 50.116 FPS :( :( :(

Here is my mediainfo details:

General
Complete name                            : E:\02_slub_Sony FX3_oryginal_002-mercalli.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/dby1/iso2/mp41)
File size                                : 29.6 MiB
Duration                                 : 8 s 640 ms
Overall bit rate                         : 28.8 Mb/s
Frame rate                               : 50.116 FPS
Recorded date                            : 2026-01-10 15:12:30 UTC
Encoded date                             : 2026-01-10 15:12:30 UTC
Tagged date                              : 2026-01-10 15:12:30 UTC
Writing application                      : Lavf59.16.100

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L5.1@Main
Codec ID                                 : hev1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 8 s 640 ms
Source duration                          : 8 s 620 ms
Bit rate                                 : 28.3 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 50.116 FPS
Minimum frame rate                       : 25.021 FPS
Maximum frame rate                       : 30 000.000 FPS
Original frame rate                      : 50.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Bits/(Pixel*Frame)                       : 0.068
Stream size                              : 29.1 MiB (98%)
Source stream size                       : 29.1 MiB (98%)
Encoded date                             : 2026-01-10 15:12:30 UTC
Tagged date                              : 2026-01-10 15:12:30 UTC
Color range                              : Full
mdhd_Duration                            : 8640
Codec configuration box                  : hvcC

Audio
ID                                       : 2
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : ac-3
Duration                                 : 8 s 635 ms
Source duration                          : 8 s 640 ms
Bit rate mode                            : Constant
Bit rate                                 : 512 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Compression mode                         : Lossy
Stream size                              : 540 KiB (2%)
Source stream size                       : 540 KiB (2%)
Service kind                             : Complete Main
Default                                  : Yes
Alternate group                          : 1
Encoded date                             : 2026-01-10 15:12:30 UTC
Tagged date                              : 2026-01-10 15:12:30 UTC
Dialog Normalization                     : -31 dB
dialnorm_Average                         : -31 dB
dialnorm_Minimum                         : -31 dB
dialnorm_Maximum                         : -31 dB

Here were my settings in Prodad 6 SAL.

...and mine.... Just did it again to be sure, and still 50fps.

So you had the same settings as mine.

The only difference that you export the file without using Nvidia GPU.
I was chatting with chatgpt and if it is a truth Prodad Mercalli 6 SAL doesn't like 50fps while exporting using NVENC HEVC. It is a common bug as it was written. Chatgpt wrote me that 50p is so friendly as 30p 60p or 23.97 etc. in Prodad Mercalli 6 SAL.

Here is a link to the file that V6 SAL stabilized... Oh, I never use HEVC on my computer though.

https://drive.google.com/file/d/1D6M1OgE_YV40FY_PM0kZ8yDXmQxbdvhM/view?usp=sharing

Thank you. ChatGPT wrote me that this bug only occurs when someone tries to export to HEVC using Nvidia GPU (based on 50p). You exported file with AVC codec, and I exported file with HEVC codec.

Ok... rendered to MP4 CPU HEVC+AC3 (h265) and still constant 50fps. Have you tried just using your CPU for rendering?

MediaInfo of the rendered clip.