[mythtv-users] MythGallery: selecting a favorite picture as directory thumb

[Roger Siddons]

On Wed, 05 Nov 2014 03:25:13 -0000, Angela <angela.schmid at wolke7.net>  
wrote:

>
> I tested today with 0.28-pre, combined FE/BE.
>

DO NOT try rotating/flipping your photos until the patch appears. It  
destroys the image exiv data.

> Opening a directory takes 3 sec / 100 pictures, this is too slow! Every
> time, each thumbnail is generated by the backend:
> galleryfilehelper.cpp:431 (SendRequest) - GalleryFileHelper SendRequestok
> [http://127.0.0.1:6544/Image/CreateThumbnail?Id=33774]
> This delay exists also when you go back to the parent directory.

Master is currently using the services API. I'm running a version that  
uses the internal protocol but I've no idea if that affects its speed.

I'm assume you're talking about ~28 folders, each with 4 thumbnails. I  
notice its sluggish when the BE is busy because the thumbnail reads are  
competing with threadedfilewriter. But with an idle BE I see it fill a lot  
quicker.

However that should only be an issue once, after a scan, as the FE fills  
its thumbnail cache in ~/.mythtv/cache/themecache/<theme>.
Thereafter I see them load instantaneously from the FE cache.


> Once my backend crashed. After reconnect, no thumbnails were  
> created/shown
> anymore. Had to go back to the menu and start the gallery again.

I think I saw this once but have never been able to reproduce it. Let me  
know if you can.

>
> I tested with the Mythbuntu theme, the thumbnail view is small (from
> upper-left, uses 60%) and are also the pictures. Theme Mythmedia Reduxwas
> OK.
>

Mythbuntu is currently using the default widgets. Themers will pick that  
up before 0.28 release. The MythCenter themes work ok with the defaults.


> No thumbnail is generated when no pictures are found in the directory, it
> doesn't recurs into subdirectories as the "old" gallery does.
> In the "old" gallery thumbnails are not generated when the first
> subdirectory does not have any pictures.
>
> Some movie files types (mkv) are not recognized. Movies did not play.
>
>> renaming, moving, deleting files/directories are missing
> You are right, although I saw the code copied.
>
> Slide Show: only fade is implemented.
>

There's several issues like that. I'll address them when I've finished  
restructuring. The original code was only partly integrated and has since  
been split between BE/FE so there's loose ends to tie up first.


> CPU usage is normal.
>
> My biggest concerns are that it is slow, as it has to contact thebackend  
> on
> each directory change to generate/retrieve the thumbnails and that it
> crashed the backend.
>
> I am not a big fan from StorageGroups, the idea is good, but the files
> should contain the sg_id. In MythVideo I have 4 disks, which in the worst
> scenario are all spinned-up.
> I have one directory defined in a StorageGroup and have symlinks to the
> other disks (directories).
>
> For the moment I am happy with the "old" gallery. Freshing it up with 
> MythUI
> as you said would be the easiest way.
>
> Is it the preferred design to create/retrieve the thumbnails from the BE
> instead of letting the FE create and retrieve thumbnails from a 
> thumbcache?
>

https://code.mythtv.org/trac/changeset/549fb22e1726c9cb7cde8b9b0bd0e040706ac24f/mythtv
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