6.0.0 video thumbnailer...

Gilles Caulier caulier.gilles at gmail.com
Sun Mar 4 17:55:58 GMT 2018

For me this entry is valid :


and we can try to close this file if we use FFMPEG directly to generate


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
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