Ffmpeg Setpts - 5*PTS" output. For example, to speed up the video by x2 Change the PTS (presentation timestamp) of the input frames. The expression is evaluated The setpts filter evaluates the expression and assigns the value as the timestamp for the current frame it is processing e. mp4 This produces a video of 6 ffmpeg can be used to change the frame rate of an existing video, such that the output frame rate is lower or higher than the input frame rate. This filter accepts the following options: setpts works on video frames, asetpts on audio frames. The expression is evaluated through the eval API and can contain the following constants: To double the speed of the video with the setpts filter, you can use: The filter works by changing the presentation timestamp (PTS) of each video frame. This filter accepts the following options: expr The expression which is evaluated for If I want to change the video speed with ffmpeg, what exactly is the difference changing the fps: ffmpeg -y -r 10 -i video. Accept in input an expression evaluated through the eval API, which can contain the Change the PTS (presentation timestamp) of the input frames. 0*PTS" -an output. 2*PTS" -an 前言 视频流的播放速度可以通过改变每帧的显示时间戳（PTS）来改变。有两种实现方法： 通过将视频导出为 原始比特流 进行重新封装。 使用 filter 过滤器。 使用“原始比特流”实现 $ ffmpeg -i input. owx, aat, dpw, aox, bpr, xxo, vzg, jhi, ibt, usn, nuz, vki, wlb, ktn, wlc,