![]() You can slow down a 30 fps video and audio at the same time with:įfmpeg -fflags +genpts -r 15 -i raw.h264 -i input.mp4 -map 0:v -c:v copy -map 1:a -af atempo=0.5 -movflags faststart output. With the raw bitstream method example from above, there is no need for a complex filtergraph. ![]() Using a complex filtergraph, you can speed up video and audio at the same time:įfmpeg -i input.mkv -filter_complex "setpts=0.5*PTS atempo=2.0" -map "" -map "" output.mkv ![]() The following with quadruple the audio speed:įfmpeg -i input.mkv -filter:a "atempo=2.0,atempo=2.0" -vn output.mkv If you need to, you can get around this limitation by stringing multiple atempo filters together. The atempo filter is limited to using values between 0.5 and 2.0 (so it can slow it down to no less than half the original speed, and speed up to no more than double the input). To double the speed of audio:įfmpeg -i input.mkv -filter:a "atempo=2.0" -vn output.mkv You can speed up or slow down audio with the atempo audio filter. Other options include slowmoVideo and Butterflow. This is also known as "motion interpolation" or "optical flow".įfmpeg -i input.mkv -filter:v "minterpolate='mi_mode=mci:mc_mode=aobmc:vsbmc=1:fps=120'" output.mkv You can smooth out slow/fast video with the minterpolate video filter. To slow down your video, you have to use a multiplier greater than 1:įfmpeg -i input.mkv -filter:v "setpts=2.0*PTS" output.mkv For example, to go from an input of 4 FPS to one that is sped up to 4x that (16 FPS):įfmpeg -i input.mkv -r 16 -filter:v "setpts=0.25*PTS" output.mkv You can avoid dropped frames by specifying a higher output frame rate than the input. Note that this method will drop frames to achieve the desired speed. For example, if there are two succesive frames shown at timestamps 1 and 2, and you want to speed up the video, those timestamps need to become 0.5 and 1, respectively. The filter works by changing the presentation timestamp (PTS) of each video frame. To double the speed of the video with the setpts filter, you can use:įfmpeg -i input.mkv -filter:v "setpts=0.5*PTS" output.mkv Then generate new timestamps while muxing to a container:įfmpeg -fflags +genpts -r 30 -i raw.h264 -c:v copy output.mp4Ĭhange the value of -r to the desired playback frame rate. Use this if you require no other changes to your input video.įirst, copy the video to a raw bitstream format.įfmpeg -i input.mp4 -map 0:v -c:v copy -bsf:v h264_mp4toannexb raw.h264įfmpeg -i input.mp4 -map 0:v -c:v copy -bsf:v hevc_mp4toannexb raw.h265 This method is lossless and apart from changing the timestamps, copies the video stream as-is. Note that in the following examples, the audio stream is not changed, so it should ideally be disabled with -an. This can be done via two methods: using the setpts video filter (which requires re-encoding) or by erasing the timestamps by exporting the video to a raw bitstream format and muxing to a container while creating new timestamps. How do I increase FPS on a GIF To change the FPS on a GIF file youll need to use an online tool. This is something that you can do using Descript’s export tool.The speed of a video stream can be changed by changing the presentation timestamp (PTS) of each video frame. Upload your file to Motionbox.io, use the speed slider to change the speed and then download the final GIF file. If you want to make adjustments to your video’s quality, that will change your video file size. No, converting your video to fast-motion or slow-motion won’t change the actual size of your video file. Will slowing down or speeding up my video change the file size? For free users, Descript video projects will export with a watermark, but Pro and Creator level exports are watermark-free. Change the speed of your video, making it faster or slower for free with Descript. How can I speed up a video for free?ĭescript’s free video editing tool lets you make the type of video content you want to create. You can make a time-lapse video or slow-motion video, or change the video playback speed in any way that you want. Step 2: Then you can see 9 different speed rates from 0.25X to 8X. After a window pop up, click the Plus icon to add the desired GIF files to speed up. Click the Toolbox menu and choose the Video Speed Controller option. Using Descript on desktop, you can take video clips sent from your mobile device and change the playback speed. Step 1: Free download and launch Aiseesoft Video Converter Ultimate on your Windows/Mac. Can Descript make playback speed changes directly on iOS and Android devices?ĭescript is currently not available on iOS and Android devices, but it is available on Mac and Windows. Descript can also change the playback speed of videos taken by your iPhone or Android device. ![]() What video formats can Descript make playback speed changes to?ĭescript works with a wide range of video file formats, including AVI, MOV, MP4, MKY, and even GIFs and video files from other platforms like iMovie. ![]()
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