thumbnail

Select the most representative frame in a given sequence of consecutive frames.

The filter accepts the following options:

n

Set the frames batch size to analyze; in a set of n frames, the filter will pick one of them, and then handle the next batch of n frames until the end. Default is 100.

log

Set the log level to display picked frame stats. Default is info.

Since the filter keeps track of the whole frames sequence, a bigger n value will result in a higher memory usage, so a high value is not recommended.

Examples

• Extract one picture each 50 frames:

  thumbnail=50
  

• Complete example of a thumbnail creation with ffmpeg:

  ffmpeg -i in.avi -vf thumbnail,scale=300:200 -frames:v 1 out.png