[FFmpeg-user] Setting the frame number as the filename while frame extraction

[Rohit]

The following command line extracts the I frames from the video

ffmpeg -i input.flv -f image2 -vf "select='eq(pict_type,PICT_TYPE_I)'"
-vsync vfr thumb%04d.png

But the frames are sequentially numbered ..like thumb0001,2,3,4,5....
Suppose the 9th frame is an I frame then I want the the extracted frame's
file name as 'thumb9.png'...suppose if 18th frame is the next I frame then
the extracted frame's filename should be 'thumb18.png' or '18.png'...

How to achieve this? Thanks in advance...



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