---- Reported by lucas@yorba.org 2010-09-16 18:47:00 -0700 ----

Original Redmine bug id: 2568
Original URL: http://redmine.yorba.org/issues/2568
Searchable id: yorba-bug-2568
Original author: Lucas Beeler
Original description:

Many digital video files are processed to fade-in from black when they begin
and fade-out to black when they end. Right now, we build the thumbnail from
the first frame of the video. If the user imports 4 videos, all of which have
fade-in effects, all of them will have unsightly pure black thumbnails. To
rectify this, we should grab our thumbnail frame from, say, a timepoint that's
1/3 of video's duration.



---- Additional Comments From shotwell-maint@gnome.bugs 2010-12-27 01:43:00 -0800 ----

### History

####

#1

Updated by Marcel Stimberg about 3 years ago

The standard gnome thumbnailer (totem-video-thumbnailer) does something
slightly more clever, it tests the frames at 33%, 66%, 10%, 90% and 50% (in
that order) for being “interestingâ€, where interesting is defined as
having a high enough variance in the b/w pixel distribution, i.e. discarding
frames with mainly one colour.

See here: http://git.gnome.org/browse/totem/tree/src/totem-video-
thumbnailer.c?id=a365d50c19b900911d7fe1bfdb24d22f8ab5bc98

####

#2

Updated by Adam Dingle about 3 years ago

Fascinating. We should do something similar.

####

#3

Updated by Adam Dingle about 3 years ago

  * **Tracker** changed from _Bug_ to _Feature_

####

#4

Updated by Lucas Beeler almost 3 years ago

  * **Status** changed from _Open_ to _5_
  * **Resolution** set to _fixed_
  * **% Done** changed from _0_ to _100_

r2399

####

#5

Updated by Adam Dingle almost 3 years ago

  * **Status** changed from _5_ to _4_
  * **Resolution** deleted (<strike>_fixed_</strike>)
  * **% Done** changed from _100_ to _0_
  * **Priority** deleted (<strike>_High_</strike>)
  * **Subject** changed from _Many video thumbnails appear black because of fade effects_ to _Generate video thumbnails by looking for pixel variance_

Reopening at priority medium: the existing implementation is fine for 0.8, but
at some point we should implement a smarter algorithm as described in Marcel's
comment above.

####

#6

Updated by Adam Dingle almost 3 years ago

  * **Status** changed from _4_ to _Review_
  * **Assignee** changed from _Lucas Beeler_ to _Anonymous_



--- Bug imported by chaz@yorba.org 2013-11-25 21:47 UTC  ---

This bug was previously known as _bug_ 2568 at http://redmine.yorba.org/show_bug.cgi?id=2568

Unknown Component 
   Using default product and component set in Parameters 
Unknown version " in product shotwell. 
   Setting version to "!unspecified".
Unknown milestone "unknown in product shotwell. 
   Setting to default milestone for this product, "---".
Setting qa contact to the default for this product.
   This bug either had no qa contact or an invalid one.
Resolution set on an open status.
   Dropping resolution