Export Video from SharePoint Asset Library via CSOM (Content Type Video is strange)

Question

I have a SharePoint asset library with many files. Some of these files have the content type "Video". Files with the content type video behave strangely. E.g. the column "File Size" is empty only for videos.

I can easily download any type of files (e.g. pdfs) via CSOM the following way:

Microsoft.SharePoint.Client.File file = ctxSource.Web.GetFileByServerRelativeUrl(fileServerRelativeUrl);  
ctxSource.Load(file);  
ctxSource.ExecuteQuery();  
  
ClientResult<Stream> mstream = file.OpenBinaryStream();  
ctxSource.ExecuteQuery();  

But this does not work for videos.

It seems, videos do not have a valid serverRelativeUrl, that I can refer to.

My question: How can I download (or copy) a video from an asset library programatically via CSOM Code?

Thanks in advance for your help!

Elmo

Answer 1

Hi @Elmo
Per my research, SharePoint creates a stub (think of it as a folder) to hold a video and all the related contents, such as user-defined properties, thumbnails, video renditions, and other documents related to the video. When you upload a video file, SharePoint automatically creates this stub for that video.
If we have mp4 file named A.mp4, the file will be stored in a folder named A in Assets library. The url should be like following

siteurl/Assets/A/A.mp4  

Here is a similar issue with yours to reference
https://sharepoint.stackexchange.com/questions/157170/csom-how-to-get-video-file

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