Error to export video: error to open the output file

Problem: I get the following error message when trying to export a video Error to export video: error to open the output file

ActivePresenter version: Versión 8.5.3 - 64-bit build

OS: Microsoft Windows 10 Enterprise Version 10.0.18363 Compilación 18363

Notes: I installed the ActivePresenter free version, and I reused a project in English, I changed the subtitles for others in Spanish and downloaded a voice from Google Cloud.

I made all the necessary changes and when I want to export it a pop-up message warns me that some features are not available in the free version, that the video will have a watermark. I click on OK and then I get the message mentioned before.

This is the log:

2021-11-25 23:22:43: ActivePresenter 8.5.3 - 64-bit build. (Release Build: 2021.10.08) started
OS: Windows 10 (build 18363), 64-bit edition
CPU Count: 8
Hostname: CSosa. Memory: 7,441 MB. Available: 2,144 MB. Memory Load: 71%
Disk Space: 113,891 MB (Free: 9,705 MB)
Project Location: C:\Users\csosa\Documents\ActivePresenter
2021-11-25 23:22:44: TempDir: C:\Users\csosa\AppData\Roaming\ActivePresenter\temp
2021-11-25 23:22:44: Direct3D rendering mode: hardware
2021-11-25 23:22:44: Direct3D device type: 1
2021-11-25 23:23:08: Opening project: C:\Users\csosa\Documents\ACTUALIZACIONES\Presentación Alkym 7.approj
2021-11-25 23:23:12: PrepareRibbonBar: 2597ms
2021-11-25 23:23:13: RLMedia: Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
2021-11-25 23:27:26: Render Project Size: 1280 x 720
2021-11-25 23:27:26: Threads Used: 3 / 8, Memory Available: 1,897/7,441
2021-11-25 23:27:26: MF Version: 131184
2021-11-25 23:27:26: s16 sample format is not supported, fltp will be used
2021-11-25 23:33:03: Render Project Size: 1280 x 720
2021-11-25 23:33:03: Threads Used: 2 / 8, Memory Available: 1,282/7,441
2021-11-25 23:33:03: s16 sample format is not supported, fltp will be used
2021-11-25 23:40:56: Render Project Size: 1280 x 720
2021-11-25 23:40:56: Threads Used: 1 / 8, Memory Available: 1,166/7,441
2021-11-25 23:40:57: s16 sample format is not supported, fltp will be used

Can you tell me what is failing? it is really important to me to get it solved ASAP.

Thanks in advance.


Hi csosa,

Can you please email entire the log file to This part of log doesn’t contain the information for analyzing.


OK, I’ll send the email with the same subject as this topic.



Thanks for sharing the files. We have checked and exported your project successfully on our machines. Can you please try exporting to another location like Desktop or using other formats (such as MKV, AVI) to see if problem occurs?

Regarding the watermark message, maybe you have used the cloud text to speech feature which is only available in the paid edition. There was a message stated that when using this feature but your colleague might not notice that.


1 Like

Thank you so much for the help!! I exported it to the desktop successfully :smiley:

Thanks for your information.

Some users reported that the problem came from antivirus software like Avast.
It wrongly blocked ActivePresenter from accessing some locations on their computer.

Do you use Avast Antivirus? If so, ActivePresenter may be wrongly blocked by this program.
Please add ActivePresenter to the allowed list of the antivirus software to see if it works.


Thanks for the hint!!

I am currently using Avast, and I never thought that it could be the cause of the error message. I have already whitelisted ActivePresenter.

Thanks again for your prompt help on this matter.