Files: Thumbnails

[jesmrec]

As an user, i want to see thumbnails, so i can check what the pic contains without downloading and opening it

• Thumbnails for non-dowloaded images / gifs
• Thumbnails for dowloaded images / gifs
• Thumbnails for videos, if the server supports it
• QA

[felix-schwarz]

Work on this has started here: #32

Thumbnails for videos sounds interesting. Do you know which formats are supported by the server?

[michaelstingl]

For thumbnails of video files, you need to install ffmpeg on the server. It can create static images or short GIF's. @cdamken could you point us to your solution?

[cdamken]

@IljaN is the one helped me to configure on my server.

[felix-schwarz]

Ok, so I assume a lot of additional formats can be added through configuration / customization that aren't contained in the stock version I currently use for testing. Not just video files, but also PDF files, Office files, etc.

While I assume most users won't have this set up, some definitely will, so the app would have to request thumbnails for every file to find out.

For a folder filled with a 1000 files without previews, that's a lot of unnecessary overhead both locally and remote.

One solution I thought about is to make the app "smart" insofar as it learns which MIME-Types it didn't get back a thumbnail for, then no longer request thumbnails for objects of the same MIME-Type. However, in the (highly likely) case someone gave a file of a supported file format a wrong suffix (say, save a PDF with a .png file name) and preview generation fails for it, thumbnails would no longer be requested for all other PNG files, either. So, nope, not a solution, either, after all.

Right now, I can see only two ways to deal with this:

1. always request thumbnails for every file
2. implement Preview API: expose supported file/MIME types via Capabilities endpoint core#31267 on the server and send requests out only for actually supported mime types

Other/better suggestions welcome. ❤️

/cc @DeepDiver1975 @michaelstingl

[michaelstingl]

I'd heavily vote for owncloud/core#31267

[cdamken]

I was checking my chat and here is the solution:

apt install ffmpeg

Add this patch:

Index: lib/private/PreviewManager.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- lib/private/PreviewManager.php	(revision 51204a304a956fa952401c7af797bf94cd2070f7)
+++ lib/private/PreviewManager.php	(date 1520353916000)
@@ -251,6 +251,7 @@
 			'OC\Preview\MarkDown',
 			'OC\Preview\MP3',
 			'OC\Preview\TXT',
+			'OC\Preview\Movie'
 		], $imageProviders));
 
 		if (in_array('OC\Preview\Image', $this->defaultProviders)) {

It could be an animation icon too if we change the line to create to:

ffmpeg -t 00:00:10 -i VID_20180305_160500.mp4 -vf scale=320:180 video.gif -hide_banner

That probably helps

[michaelstingl]

There is also ffmpegthumbnailer that could help…