Generate images at given time from flv video using ffmpeg -


I am using the following command in ffmpeg to generate thumbnails: This is working correctly. 

  ffmpeg -i videofile.flv -an -ss 01:00:00 -an -r 1 -vframes 1 -y ". $ Outputdir." / "$ $ But the problem is that I have different videos from which the thumbnail is to be generated and Iam is still using a loop. It is very slow I found the reason because FFPAP is for every command For the time given, I tried to trap this process but is not effective. Can I customize the command anyway so that the repeated efforts can be avoided?   
 
 
 Try it out:  
  ffmpeg -ss 01:00:00 -i videofile.flv ....   
 Using  -ss  as an input option is often faster but may be less accurate FFMPEG immediately Be desired and then start decoding on your desired  -ss  value; However, this is probably not as accurate as an output option in the form of  -ss  Code> -ss  before decoding.

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