![]() The example below assumes the source video was 24 frames/second so that audio needed to be slowed to half (0.5) speed using ffmpeg's atempo filter. If the video contains audio you can also slow that down without changing the pitch, but it is not a lossless conversion. Here is an example that changes a video to 12 frames/second: mkvmerge -default-duration 0:12fps -fix-bitstream-timing-information 0 original-video.mp4 -o temp-video.mkvįfmpeg -i temp-video.mkv -c:v copy slow-video.mp4 It requires remuxing the file to a different containter format MKV and then remuxing it back into an MP4. ![]() Lossless (video) remuxingĪs noted in the comments there is a way to do this where the video does not I know this is an old question but none of the current answers are the recommended way anymore.
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