[FFmpeg-user] Scene detection

Mark Himsley mark at mdsh.com
Sun Aug 7 16:47:15 CEST 2011

On 07/08/2011 15:16, lovelove wrote:
> Hi, can someone please help a desperate soul like me?
> I am in the same situation as Fori Pepe
> Fori Pepe wrote:
>> I would like to export/extract images from videos at every scene changes.
>> Is it possible to use ffmpeg to create images on scene changes?
>> It would be the most comfortable to use it like this: 
>> ffmpeg -i test.mpg --detect_scene_changes newscene[00-99].png
> ... i.e. export first frame of each new scene as an image. This effectively
> generates a storyboard.
> It also would be an enormous help in identifying added and deleted scenes
> when comparing 2 videos.
> this was the last answer in that thread:
> Stefano Sabatini wrote:
>> The fake syntax for a lavfi filter [...] would be something of the kind: 
>> ffmpeg -i in.avi -vfilters "[IN] split [SC_DETECT] [OUT], [SC_DETECT]
>> sc_detect=PARAMS, process_sc_frames=PARAMS"  /dev/null 
>> As you see you would need two filters, one detecting scene changes and 
>> outputting the detected scene change frames to the output, and a 
>> filter to furtherly processes the information of the frames, for 
>> example it could print to a file the timestamp of the file or to 
>> render as an image file the processed frames. 
>> The sc_detect filter implementation is the tricky part, but 
>> a naive implementation shouldn't be too hard to accomplish.

I wonder if any code from the BBC R&D's open source (LGPL) Video Shot
Change Detector could be used?



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