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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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3
core/pref.h
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@ -103,6 +103,9 @@ struct preferences {
// ********** General **********
bool auto_recalculate_thumbnails;
bool extract_video_thumbnails;
int extract_video_thumbnails_position; // position in stream: 0=first 100=last second
const char *ffmpeg_executable; // path of ffmpeg binary
int defaultsetpoint; // default setpoint in mbar
const char *default_cylinder;
const char *default_filename;