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meisa233/ffmpeg_extract_frames.md

Last active July 9, 2024 06:54
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use ffmpeg to extract frames and convert image sequence to video
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ffmpeg_extract_frames.md

extract fixed number frames

ffmpeg -ss 00:00:00 -i input.mp4 -vsync 0 -an -vframes 600 -f image2 -start_number 0 %05d.png

start time: 00:00:00
frame number: 600
output format: %05d.png
start_number: start number of output images
extract frames by specified duration

ffmpeg -ss 00:00:00 -i input.mp4 -t 2 -f image2 -vsync 0 %05d.png

convert image sequence to video(.avi)

ffmpeg -f image2 -start_number 1000 -i %d.png -c:v copy -r 25 output.avi

Note that cfr will provent constant bitrate(-x264-params "nal-hrd=cbr:force-cfr=1" -b:v 88M -minrate 88M -maxrate 88M -bufsize 88M)

ffmpeg -i mimituzhi_restorage.avi -c:v libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v 88M -minrate 88M -maxrate 88M -bufsize 88M mimituzhi_264_.mp4
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