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====== ffmpeg - Video - Frame - Delete Every Nth Frame ======

To delete every 24th frame from a video with a frame rate of 25 fps and duplicate the 23rd frame.

<code bash>
#!/bin/bash

INPUT_FILE="input.mkv"
OUTPUT_FILE="output.mkv"

# Calculate the number of frames to remove.
FRAMES_TO_REMOVE=$(( $(ffprobe -v error -select_streams v:0 -show_entries stream=nb_frames -of csv=s=0:p=0 $INPUT_FILE) % 24 ))

# Calculate the frame index of the frame to duplicate.
DUPLICATE_FRAME_INDEX=$(( $FRAMES_TO_REMOVE + 1 ))

# Calculate the new frame rate.
NEW_FRAME_RATE=$(echo "scale=2; (25 - $FRAMES_TO_REMOVE)/25" | bc)

# Remove every 24th frame and duplicate the 23rd frame.
ffmpeg -i $INPUT_FILE -vf "setpts=($NEW_FRAME_RATE*NTSC_DROP*IF_GTE(scene\,0)+(scene\,0))/($NEW_FRAME_RATE*NTSC_DROP),format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,setpts=NTSC_DROP*1001/($NEW_FRAME_RATE*1001)*IN_DURATION/($FRAMES_TO_REMOVE+1),format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420p,fps=$NEW_FRAME_RATE,unsharp_mask=5:5:0.8,format=yuv420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