Changing the speed of a video is broken in several ways [SOLVED]

[mhwarner]

I added a single clip.  Changed the speed to 200%.  It changed the stated video duration but it did not speed up the clip.  Also, I could not publish the show to an .mp4.  The publish window just sat there and never did anything.  It did create a 1KB file with the name but that's all.  I went back in and tried to change the speed from 200% back to 100%.  Moved the slider then manually typed in the number.  Closed the window and PTEAV just locked up and I had to "End Process".  

I started over with another clip.  I changed the speed to 50%.  That worked ok but then I tried to trim the end of the video and the window never showed me the end.  I could go in and trim the video first and then set the speed to 50% and that worked fine.  

Just for the record, I experiment with ticking the "Interpolation" box for this video, but the video then became quite blurry.  Apparently the interpolation is only intended for extremely slow videos.

I tried again with the second clip and trimmed in first then set to 200% speed.  Duration changed, but not speed.  Went back and again attempted to reset speed to 100% and the little display window went black and then when I closed the Trim and Adjust Speed window, PTEAV once again locked up and I had to shut it down.

I tried one more time and trimmed first and adjusted speed to 200%.  Duration changed, actual video speed did not.  This one did publish.

Setting video speed definitely has some issues.  Let me know if you need further information.

I did go into V11 and set the speed on both videos I had tried to 200% speed and they did indeed speed up and I was able to save them.

FYI, I am on a PC running Win 24H2 with 64 GB memory.

[Igor]

On 1/18/2026 at 7:53 AM, mhwarner said:

I added a single clip.  Changed the speed to 200%.  It changed the stated video duration but it did not speed up the clip.  Also, I could not publish the show to an .mp4.  The publish window just sat there and never did anything.  It did create a 1KB file with the name but that's all.  I went back in and tried to change the speed from 200% back to 100%.  Moved the slider then manually typed in the number.  Closed the window and PTEAV just locked up and I had to "End Process".  

Hi Mary,

Thanks for checking video editing functions. Please send me this video file which causes freezing and incorrect speed. Better with a project file (.pte). Write me a personal message with a link.

I found a couple of issues with editing of video speed and duration. We'll fix it. 

[Igor]

On 1/18/2026 at 7:53 AM, mhwarner said:

I started over with another clip.  I changed the speed to 50%.  That worked ok but then I tried to trim the end of the video and the window never showed me the end.  I could go in and trim the video first and then set the speed to 50% and that worked fine.  

I reproduced this issue. Thanks.

[Igor]

I moved several recent posts regarding integration of PTE Video Optimiser and PTE AV Studio to a new topic:
https://www.pteavstudio.com/forums/topic/52710-why-is-video-optimiser-still-a-separate-tool/

[Igor]

On 1/18/2026 at 7:53 AM, mhwarner said:

I started over with another clip.  I changed the speed to 50%.  That worked ok but then I tried to trim the end of the video and the window never showed me the end.  I could go in and trim the video first and then set the speed to 50% and that worked fine. 

We fixed it in Beta 4.

[mhwarner]

I started over with another clip.  I changed the speed to 50%.  That worked ok but then I tried to trim the end of the video and the window never showed me the end.  I could go in and trim the video first and then set the speed to 50% and that worked fine. 

We fixed it in Beta 4.

I can confirm that this is working now.  Thank you.

[mhwarner]

" added a single clip.  Changed the speed to 200%.  It changed the stated video duration but it did not speed up the clip. And during playback, the video ends prematurely because it is not speeded up.  Also, I could not publish the show to an .mp4.  The publish window just sat there and never did anything. "  This part is NOT RESOLVED.  Please check your messages for link to a zipped pte file to confirm.

[AleAle5025]

I tried it on my end more than once. Speeding up, slowing down — everything works. There is a complete freeze frame, and there is acceleration. I exported the video in 4K at 60 frames per second.
I separated the audio file from the video so I could watch the video with sound. I tested it on both long and short video files. Everything works perfectly.

[Igor]

Hi Mary,

Thanks for sending me the sample video file and project!

I've reproduced the issue with freezing on video encoding and strange speed. We'll check the code.

[Igor]

On 1/25/2026 at 4:00 AM, mhwarner said:

Also, I could not publish the show to an .mp4.  The publish window just sat there and never did anything. "  This part is NOT RESOLVED.  Please check your messages for link to a zipped pte file to confirm.

Hi,

Please try the new Beta 5. The program will no longer freeze during video encoding for projects containing trimmed video objects.

If you change a speed of a video object, the result will be visible in MP4 video export, mini-player, full-screen preview, and the Objects and animation window. It is not yet available in the Trim and Adjust Speed window preview - we will add this in a future Beta.