[gst-devel] How to get thumbnail/preview image of a video file using GStreamer API ?

[Stefan Kost]

Am 25.02.2010 19:05, schrieb Burka Victor:
> 
> Thanks. Its almost what I'm looking for but not exactly. The point is it
> may be hard to find a correct frame. I mean it again, may be all dark,
> red, etc. So I was thinking that there is some predefined image that is
> either embedded or through some property specified as an index in a
> whole frame set, that is selected by video file creator and is "good"
> and is supposed to be used as a thumbnail image. Does it exist ? Say
> through some "preview-image" or "preview-image-index" thing ?
> 

Unfortunately videos commonly don't have such metadata. I agree it would be nice
if they should at least have a timestamp to point to a good preview images
(preferably a keyframe as well),

Stefan

> Regards,
> Victor
> 
> 
> 25.02.10, 21:48, "sudarshan bisht":
> 
>     HI ,
>                  For this you can write a Gstreamer applications where
>     you have a basic pipeline which has filesrc , decodebin , encoder (
>     if you want to have encoded file as a thumbnail e.g. png or jpg )
>     and filesink . Now once you have this pipeline , seek to a
>     particular position in video file so that you get a valid frame
>     because very first frame can have invalid/ blank data.
>                  After seek run this pipeline for a single frame of data
>     , and you can get a thumbnail. To resize your thumbnail you can use
>     video resize plugins also.
>         
>      
>     On Thu, Feb 25, 2010 at 9:10 PM, Burka Victor
>     <burka.victor at yandex.ru <mailto:burka.victor at yandex.ru>> wrote:
> 
>         Hello,
> 
>         Can you help me with the following: I need to display a
>         thumbnail image of my video file in the video player playlist
>         that I'm developing. So was looking in the GStreamer API how to
>         get a thumbnail image. I understand I might depend on a file
>         format, but is it any way to get that picture ? I found in the
>         Internet something called "preview" or "preview-image" tags that
>         I can retrieve, but again I didn't find how in the API.
> 
>         Thanks,
>         Victor
> 
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> 
> 
> 
>     -- 
>     Regards,
> 
>     Sudarshan Bisht
> 
> 
> 
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