Opened 17 months ago

Last modified 17 months ago

#9118 new enhancement

Thumbnails in DASH

Reported by: maral Owned by:
Priority: wish Component: undetermined
Version: git-master Keywords: dash
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Dear all,

I would like to notice the lack of an important functionality for ffmpeg DASH, which is adding tiled thumbnails to the current manifest.

Those can be generated attaching an adaptation set in the manifest according: DASH-IF IOP version 4.2, section 6.2.6 defines the notion of image-based tracks in DASH: https://dashif.org/docs/DASH-IF-IOP-v4.3.pdf.

So would it be possible to implement the option for dash to generate thumbnails at same time that DASH content is generated, and to attach them in the manifest? For dynamic and static manifests.

Tiled thumbnails can be generated with the following command:

ffmpeg -i INPUT -q:v 20 -vf "select=not(mod(n\,<<framerate>>)),scale=480:270,tile=<<tileduration>>x1" -vsync vfr output%d.jpg

An then an adaptation set could be added according to:

<AdaptationSet contentType="image" id="4" mimeType="image/jpeg">

<BaseURL><<httpURL>></BaseURL>
<SegmentTemplate duration="<<tileduration>>" media="output$Number$.jpg" startNumber="1" />
<Representation bandwidth="12895" height="270" id="thumbnails_256x144" width="43200">

<EssentialProperty schemeIdUri="http://dashif.org/guidelines/thumbnail_tile" value="<<tileduration>>x1" />

</Representation>

</AdaptationSet>

Change History (1)

comment:1 by Carl Eugen Hoyos, 17 months ago

Keywords: dash added
Priority: normalwish
Version: unspecifiedgit-master
Note: See TracTickets for help on using tickets.