Created attachment 158817 [details]
The slideshow impress

With the impress, I attach to video

Created attachment 158818 [details]
The video to insert in slideshow

cannot reproduce on LO 6.4.1.2, Linux, VCL kf5, locale de-de.

Please provide a detailed step-by-step description of how you inserted the video file into the presentation.

might be a duplicate of #131310, though I cannot confirm either one of them here.

Hello,
Following your request, I will try to detail these steps.
1) I use version 6.4.1.2 of Libre Office
2) I insert my images which are in a folder
3) In one of these slides, I insert a small avi video which is in another folder.
4) I save everything in pps under "Power Point 97-2003 (* .ppt)
5) Without closing the slideshow, I start the slideshow, or each slideshow advances at the "click" of the mouse.
6) When I get to the slide with my video, I see "a fraction of a second" the video appear,
the sound is also present, but instead of the image of my video an all black surface.
Hoping to have answered your request. Thanks for your help.
cordially

thank you.
How exactly did you insert the image under your no 2?
I am asking that because there are multiple ways to insert an image.

Good evening, to insert this video, I clicked on the "Insert" tab and I selected "Movies and sounds", indicating the path where this * .avi file was located
cordially

Hello,
I found a workaround for this video that appears on the slide and disappears as soon.
First, I changed the format of my video which was * .avi, to * .wmv
Instead of giving the path to my video in my slide, I dragged and dropped this video from its storage location in the slide, and everything works fine

Your workaround contains two steps. Can you please try to
1: change the file type to wmv and include it via menu AND
2: do not change the file type but drag the AVI file into the presentation (instead of using the menu for inserting)

After trying these two alternatives, please let us know which of them has fixed the problem. Thank you.

Hello, I just did 4 esais by numbering each slideshow from 1 to 4, and after each modification, I saved the slideshows.
The n ° 1 was with the menu "Insertion / sound or video" by indicating the place where is this file * .avi
No. 2 with the "Insertion / sound or video" menu, indicating the location of this * .wmv file
# 3 with "drag and drop" * .avi file
# 4 with "drag and drop" * .wmv file
For n ° 1 and 2 the video does not start and the image is replaced by an icon representing a piece of film.
For n ° 3 and n ° 4 drag and drop works very well.
A question outside of my subject. In the toolbar, I do not see the big letter "T" appear how to make it appear? Thank you for your help
Good day, I am at your disposal

P.S I manage less and less to find how to connect to this forum, not knowing a word of English, I am looking blind, hence my delay in answering some times.

Thank you for trying. In that case, I'd say this problem is not related to the included files themselves but to the process of inserting them.

Did you check the button "include as link" in the file dialog when inserting the video? then please try to uncheck it when inserting.

From which device and folder did you try to insert the file? Was it a removable disc or drive or a network/cloud folder?

For the latter question please provide a step-by-step description of how exactly you inserted the video (what did you click/type in which order) or attach a recorded desktop video.

Hello friends.
I thought my video problem in my slideshow solved, but it is not. At home it works because the 2 sound files (wmv) are in my PC, but when I send this slideshow to relatives, the videos do not work. I have to send the 2 "wmv" sound files they save to the desktop to a few, for the videos to work.

This bug is filesave od video to PPT. Sample ODP with AVI is attachment 179322 [details]. 
In bug 53970 PPTX was resolved. I set this one to New again.