ffmpeg duplicates

Remove sequentially duplicate frames when using FFmpeg

Is there any way to detect duplicate frames within the video using ffmpeg?

I tried -vf flag with select=gt(scene\,0.xxx) for scene change. But, it did not work for my case.

Solution

Use the mpdecimate filter, whose purpose is to "Drop frames that do not differ greatly from the previous frame in order to reduce frame rate."

This will generate a console readout showing which frames the filter thinks are duplicates.
```
ffmpeg -i input.mp4 -vf mpdecimate -loglevel debug -f null -
```
To generate a video from a video source with audio with the duplicates removed
```
ffmpeg -i input.mp4 -vf mpdecimate -vsync vfr out.mp4
```
To generate a video from a video source without audio with the duplicates removed
```
ffmpeg -i input.mp4 -vf mpdecimate,setpts=N/FRAME_RATE/TB out.mp4
```

The setpts filter expression generates smooth timestamps for a video at FRAME_RATE FPS. See an explanation for timestamps at What is video timescale, timebase, or timestamp in ffmpeg?