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Videos do not display preview thumbnails

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wellywu:
I installed Ubuntu 18.04.2 64 bit LTS GNU/Linux with Linux kernel version 5.0.6 64 bit and I am using a new XFX AMD Radeon VII GPU. I researched the Phoronix article to download the firmware files and I put them into /lib/firmware/amdgpu and I bought Tony George's Ubuntu Kernel Update Utility and licensed it to install the latest Linux kernel version. After I restarted, my AMD GPU was properly detected and it just works. I installed JRiver Media Center 24 and 25, but not at the same time and licensed both of them separately. I successfully imported my private media library, but under the Videos section, very few preview thumbnails showed up in either version. Most of my defined categories under the Video section show up empty with almost no preview thumbnails. I did use VLC to play my videos, movies and TV shows and each title plays just fine.

I also own a mid-2017 ASUS ROG STRIX GL702ZC gaming notebook PC and a mid-2018 Huawei Matebook X Pro Intel Ultrabook laptop and I recently installed Ubuntu 18.04.2 64 bit LTS GNU/Linux on each laptop along with JRiver Media Center 25 Master License 64 bit. I am using JRiver Media Center version 25.0.15 64 bit right now on my three Ubuntu powered PCs. For both laptops, my Videos section appears normal and I can see preview thumbnails for the same titles and play them within the software product. This is not the case for my mid-2017 AVA Direct gaming desktop PC and I do not know why.

How can I get useful technical information to this community to investigate why this technical issue exists and how to solve it?

Awesome Donkey:
Does the build missing thumbnails option (located in MC's Options > Tree & View > Thumbnails) help any?

wellywu:
That does not work. Each sub-category under the Videos pane says that there are no files and Media Center is asking me to add files for it to display thumbnail previews. I tried to rebuild my thumbnails and it didn't fix anything. I also deleted my media library database and re-imported it from scratch and I got the same problem.

I played random movies, TV shows and videos from this hard disk drive and everything plays fine using VLC. I also tested Media Center on my two laptops and the thumbnail previews show up under each sub-category under Videos and each title plays just fine. This is really odd.

Is there any way I can get you more technical information like logs?

arrowc:
play the video, pause, take a screenshot and use as cover art?

wellywu:
I have multiple local and cloud backups of my data that I keep in my apartment or within my iDrive personal account. I decided to plug in my Transcend StoreJet H3 rugged hard disk drive and copy my videos folder back to my internal hard disk drive in my AVA Direct gaming desktop PC right now. It is possible that by overwriting the same data on the internal Western Digital Black 6TB desktop hard disk drive that this could solve my problem, but I will not know until the data is recopied and I re-import using Media Center again.

Let me be clear. JRiver Media Center 24 and 25 Master License do not display any files under my Videos pane for the different sub-categories that I defined as separate looks. So, most of my custom sub-folders under the Videos pane show nothing. Media Center said it found no files and it is displaying nothing. Yet, I navigated to different sub-folders in my videos folder on my WD Black 6TB desktop HDD and play random titles and I get no errors; videos play back fine. Media Center can't find them on my AVA Direct gaming desktop PC.

Hopefully, recopying and overwriting my videos folder on the WD Black 6TB desktop HDD is going to solve it and Media Center will find those files and display preview thumbnails normally. Time will tell.

I have never encountered this problem beforehand and I have switched between GNU/Linux and Microsoft Windows 10 64 bit on the same three PCs multiple times in the past.

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