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Dive media: Extract thumbnails from videos with ffmpeg

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Extract thumbnails using ffmpeg.
Behavior is controlled by three new preferences fields:
 - extract_video_thumbnails (bool): if true, thumbnails are calculated.
 - extract_video_thumbnail_position (int 0..100): position in video
   where thumbnail is fetched.
 - ffmpeg_executable (string): path of ffmpeg executable.

If ffmpeg refuses to start, extract_video_thumbnails is set to false
to avoid unnecessary churn.

Video thumbnails are marked by an overlay.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-07-10 15:04:35 +02:00 • committed by Dirk Hohndel
parent 51066e5478
commit fce42d4858
14 changed files with 727 additions and 20 deletions
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11
core/imagedownloader.h
View file

@ -46,6 +46,9 @@ public:
public slots:
void imageDownloaded(QString filename);
void imageDownloadFailed(QString filename);
void frameExtracted(QString filename, QImage thumbnail, duration_t duration, duration_t offset);
void frameExtractionFailed(QString filename, duration_t duration);
void frameExtractionInvalid(QString filename, duration_t duration);
signals:
void thumbnailChanged(QString filename, QImage thumbnail, duration_t duration);
private:
@ -56,22 +59,26 @@ private:
};
Thumbnailer();
Thumbnail fetchVideoThumbnail(const QString &filename, const QString &originalFilename, duration_t duration);
Thumbnail extractVideoThumbnail(const QString &picture_filename, duration_t duration);
Thumbnail addPictureThumbnailToCache(const QString &picture_filename, const QImage &thumbnail);
Thumbnail addVideoThumbnailToCache(const QString &picture_filename, duration_t duration);
Thumbnail addVideoThumbnailToCache(const QString &picture_filename, duration_t duration, const QImage &thumbnail, duration_t position);
Thumbnail addUnknownThumbnailToCache(const QString &picture_filename);
void recalculate(QString filename);
void processItem(QString filename, bool tryDownload);
Thumbnail getThumbnailFromCache(const QString &picture_filename);
Thumbnail getPictureThumbnailFromStream(QDataStream &stream);
Thumbnail getVideoThumbnailFromStream(QDataStream &stream);
Thumbnail getVideoThumbnailFromStream(QDataStream &stream, const QString &filename);
Thumbnail fetchImage(const QString &filename, const QString &originalFilename, bool tryDownload);
Thumbnail getHashedImage(const QString &filename, bool tryDownload);
void markVideoThumbnail(QImage &img);
mutable QMutex lock;
QThreadPool pool;
QImage failImage; // Shown when image-fetching fails
QImage dummyImage; // Shown before thumbnail is fetched
QImage videoImage; // Place holder for videos
QImage videoOverlayImage; // Overlay for video thumbnails
QImage unknownImage; // Place holder for files where we couldn't determine the type
QMap<QString,QFuture<void>> workingOn;