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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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4
core/subsurfacestartup.c
View file

@ -100,6 +100,8 @@ struct preferences default_prefs = {
.cloud_timeout = 5,
#endif
.auto_recalculate_thumbnails = true,
.extract_video_thumbnails = true,
.extract_video_thumbnails_position = 20, // The first fifth seems like a reasonable place
};
int run_survey;
@ -287,6 +289,7 @@ void setup_system_prefs(void)
subsurface_OS_pref_setup();
default_prefs.divelist_font = strdup(system_divelist_default_font);
default_prefs.font_size = system_divelist_default_font_size;
default_prefs.ffmpeg_executable = strdup("ffmpeg");
#if !defined(SUBSURFACE_MOBILE)
default_prefs.default_filename = copy_string(system_default_filename());
@ -331,6 +334,7 @@ void copy_prefs(struct preferences *src, struct preferences *dest)
dest->facebook.access_token = copy_string(src->facebook.access_token);
dest->facebook.user_id = copy_string(src->facebook.user_id);
dest->facebook.album_id = copy_string(src->facebook.album_id);
dest->ffmpeg_executable = copy_string(src->ffmpeg_executable);
}
/*