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After doing some research on this I found that the following command line option works well with ffmpeg: ffmpeg -i input.mp4 -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2[a]" -map "[v]" -map "[a]" -c:v libx264 -c:a aac output.mp4 First install ffmpeg. setpts is for video speed (.5 means twice as fast). atempo is for audio speed (2 means twice as ...
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