[KPhotoAlbum] troubleshooting mplayerthumbs?

[Timothee Groleau]

Hi Johannes, thanks for your reply!

I have fixed my problem by using the source from git instead of the 
kphotoalbum ebuild provided by gentoo. Just for completeness, I'll still add 
the clarifications you requested below, in case other people have the same 
issue.

I'm having other issues with this latest git snapshot btw (crashes when a 
video thumbnail plays through video), but I should make a separate thread for 
that.


Anyway, thanks again!
Tim



On Monday 23 July 2012 20:09:07 Johannes Zarl wrote:
> Hi Tim,
> 
> Can you provide a little bit more detail on what exactly is working/not-
> working? I.e. is KPA just sitting idle, not doing anything when new videos
> are added, or is it doing some work and just the end result is not
> displayed?

It seems it was doing some work but result was not displayed. All new detected 
videos would show the default icon instead of a correct extracted thumbnail. I 
could also right-click on a video and select "recreate selected thumbnails", I 
could see a flicker in the ui, but the same default would show up. If I did 
that the same "recreate thumbnail" process on the video which *did* have a 
proper thumbnail, they too would end up having the default thumbnail.


> Regarding mplayerthumbs/kffmpegthumbnailer: Currently KPA directly invokes
> mplayer to get thumbnails. To get a vague idea of what could be the problem,
> you could try invoking mplayer manually:
> 
> mplayer -nosound -ss 10 -vf screenshot -frames 1 -vo png:z=9 SOME_VIDEO.EXT

That command works fine on my videos, it generates a file 00000001.png which 
is a proper grab from the video.


> Codewise, the thumbnailing is done inside the ImageManager. AFAIK you'll
> want to take a look at the classes VideoThumbnailsExtractor and
> ExtractOneVideoFrame.

Many thanks for the information!


> 
> HTH,
>   Johannes



> 
> On Monday 23 July 2012 17:55:56 Timothee Groleau wrote:
> > Hi there,
> > 
> > video thumbnailing with mplayerthumbs has not been working for me for some
> > time in kphotoalbum. I've deferrered fixing it, and I don't remember when
> > or how it broke (I'm gonna guess an upgrade to either konqueror or
> > kphotoalbum).
> > 
> > I've decided I must finally fix it, but I'm not able to see any errors
> > message anywhere. How should I go about troubleshooting?
> > 
> > Below are some info about my system,
> > 
> > gentoo amd64
> > kphotoalbum 4.2 on kde 4.8.3
> > mplayerthumbs-4.8.3 (with mplayer backend; because thumbnailing in
> > konqueror doesn't work with phonon backend)
> > mplayer-1.0_rc4_p20110322-r1
> > 
> > For reference, video thumbnailing works in konqueror, with setting enabled
> > "Video Files (MPlayerThumbs)", and video playback works in kphotoalbum.
> > video thumbnailing used to work in kphotoalbum, and the old thumbnails are
> > still ok. I've tried installing kffmpegthumbnailer instead, and I've
> > managed to set that up in konqueror, but had no success with kphotoalbum
> > either.
> > 
> > In case it matters, I've re-emerged mplayerthumbs and then kphotoalbum
> > again, to make sure it'd be compiled after, still no luck.
> > 
> > Any help would be much appreciated. Please let me know what other
> > information or details about my setup I should send.
> > 
> > Thanks in advance!
> > Tim.
> 
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