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If you want to remove a single I-frame, you have to extract the bitstream to an Annex B format (e.g. ffmpeg -i input.mp4 -c:v copy -an output.h264, and then find the bytes that represent the NAL unit(s) containing the frame(s) you want to remove. Remove those bytes until the next start code, and save the stream. Or, you could splice the video by using the ...

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