6.11.9 ffmpeg 调整播放速度

声音视频同时调节:ffmpeg -i in.mp4 -filter_complex -r 25 "[0:v]setpts=1.25PTS[v];[0:a]atempo=0.8[a]" -map "[v]" -map "[a]" out.mp4
只调节视频:ffmpeg -i in.mp4 -an -filter:v -r 25 "setpts=0.8
PTS" out.mp4
只调节音频:ffmpeg -i in.mp3 -filter:a "atempo=1.25" -vn out.mp3

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