So I think there are two aspects to this.
1.
player.getThumbnail(x) should return the thumbnail also for in manifest thumbnails, if the format is supported.
i believe the stream is implementing DASH-IF-IOP standard
Can you share your stream or double check if this is the case? We do support DASH-IF-IOP thumbnails.
2.
Is there any bitmovin method to show the thumbnails at a specific time without using the default mouse seek functionality? (programatically)
Short answer is no, there’s no built in API to do this. But all the code should be present to achieve something like this.
The event which triggers updating the values (and the thumbnail) is here:
And the code which makes the SeekbarLabel visible is here:
The positioning of the SeekbarLabel is here:
When combining all of those calls in your keyboard navigation should show the small thumbnail preview.
Hope this helps.