6.0.0 video thumbnailer...

[Maik Qualmann]

Gilles,

do you use QtAV from the git/master? If so, it may be due to a new signal in 
the video frame extractor compared to version 1.12. I could fix that.

Maik

Am Sonntag, 4. März 2018, 23:00:17 CET schrieb Gilles Caulier:
> And this line :
> https://cgit.kde.org/ffmpegthumbs.git/tree/CMakeLists.txt#n16
> 
> Gilles
> 
> 2018-03-04 22:58 GMT+01:00 Gilles Caulier <caulier.gilles at gmail.com>:
> > Look this line :
> > 
> > https://cgit.kde.org/ffmpegthumbs.git/tree/ffmpegthumbnailer.h#n21
> > 
> > Gilles
> > 
> > 2018-03-04 19:27 GMT+01:00 Maik Qualmann <metzpinguin at gmail.com>:
> >> Gilles,
> >> 
> >> libffmpegthumbnailer has no KIO dependencies, only C and FFMpeg. Or I do
> >> not
> >> look right? Does the package exist in your Linux distribution?
> >> 
> >> https://github.com/dirkvdb/ffmpegthumbnailer/tree/master/lib
> >> ffmpegthumbnailer
> >> 
> >> Maik
> >> 
> >> Am Sonntag, 4. März 2018, 18:56:48 CET schrieb Gilles Caulier:
> >> > Another one : https://bugs.kde.org/show_bug.cgi?id=387892
> >> > 
> >> > not reproducible here, but with FFMPEG, this will kill the bug...
> >> > 
> >> > Gilles
> >> > 
> >> > 2018-03-04 18:55 GMT+01:00 Gilles Caulier <caulier.gilles at gmail.com>:
> >> > > For me this entry is valid :
> >> > > 
> >> > > https://bugs.kde.org/show_bug.cgi?id=390443
> >> > > 
> >> > > and we can try to close this file if we use FFMPEG directly to
> >> 
> >> generate
> >> 
> >> > > thumbnailer...
> >> > > 
> >> > > Gilles
> >> > > 
> >> > > 2018-03-04 17:49 GMT+01:00 Gilles Caulier <caulier.gilles at gmail.com>:
> >> > >> Hi all,
> >> > >> 
> >> > >> Since i written the FFMPEG video metadata parser in 6.0.0 branch,
> >> > >> i'm
> >> > >> trying to register a huge video collection from my host computer.
> >> > >> 
> >> > >> Here, more than 2500 MKV files are present, plus a lots of MP4, MOV,
> >> 
> >> and
> >> 
> >> > >> another media taken with cellular and camera.
> >> > >> 
> >> > >> The registration have been very fast. 2500 file parsed in 2 minutes
> >> 
> >> and
> >> 
> >> > >> ready to use. System has SSD, Sqlite, 8 cores, and 32Gb of RAM. No
> >> 
> >> crash
> >> 
> >> > >> all work fine... excepted... the video thumbnails.
> >> > >> 
> >> > >> I facing random dysfunctions with video files. Sometime thumbs are
> >> 
> >> there,
> >> 
> >> > >> sometime not. Using F5 always give a different results until i try
> >> > >> to
> >> > >> insist and i can see the DB locked and revival...
> >> > >> 
> >> > >> The video thumbnailer is based on QtAV frame extractor. My QtAV is
> >> 
> >> last
> >> 
> >> > >> stable 1.12.0. I suspect a bug somewhere in QtAV, as i can see
> >> > >> thumbnailer
> >> > >> code including a lots of mutex to prevent concurrency.
> >> > >> 
> >> > >> This is typically abnormal. FFMPEG API is re-entrant as i checked
> >> 
> >> with
> >> 
> >> > >> the multi-threaded metadata parser unit test.
> >> > >> 
> >> > >> As we depend now directly of FFMPEG API, I propose to rewrite the
> >> 
> >> video
> >> 
> >> > >> thumbnailer with libav C function.
> >> > >> 
> >> > >> We have code ready to use with ffmpeg API here :
> >> > >> 
> >> > >> https://cgit.kde.org/ffmpegthumbs.git/tree/
> >> > >> 
> >> > >> Your viewpoint ?
> >> > >> 
> >> > >> Gilles