ffmpeg # drawtext进阶 02 打印帧序号和pts

• 打印秒数

ffmpeg -f lavfi -i testsrc -t 20 timer1.mp4

• 打印视频的当前是第几帧:

ffmpeg -i bunny.mp4 -vf drawtext=fontcolor=white:fontsize=40:fontfile=msyh.ttf:line_spacing=7:text=%{n}:x=50:y=50 -vframes 600  -y out.mp4

image.png

• 打印视频的当前pts在视频

ffmpeg -i bunny.mp4 -vf drawtext=fontcolor=white:fontsize=30:fontfile=msyh.ttf:line_spacing=7:text=%{pts}:x=50:y=50 -vframes 600  -y out.mp4

image.png

• 打印当前帧的类型

 ffmpeg -i bunny.mp4 -vf drawtext=fontcolor=white:fontsize=20:fontfile=msyh.ttf:line_spacing=7:text=%{pict_type}:x=50:y=50 -vframes 600  -y out.mp4

image.png image.png

References:

https://ffmpeg.org/ffmpeg-filters.html#drawtext-1