Ffmpeg speed up video and audio

Ffmpeg speed up video and audio

Ffmpeg speed up video and audio. ffmpeg -i input1. mp4: Specifies the input video file. >change audio tempo by the inverse of the video speed. Increase the playback speed of a video file using FFmpeg, useful for creating time-lapse effects or summarizing content. You can speed up or slow down the extracted audio file using the following command: ffmpeg -i input_video. Th 3 Answers. You can use a faster -preset for faster encoding. mp4 It says: Value 0. 51x. Oct 5, 2015 · ffmpeg -i video. mp4 -c:v libx264 -crf 31 -c:a aac -b:a 64k -movflags +faststart output. mp4". mp4 will be your original video between 00:00:04 to the end of the video, "-ss" is "starting time". 3 seconds. flv -f mp4 -vcodec libx264 -acodec aac -copyts -strict experimental -fpre /opt Aug 22, 2014 · Your command would be: ffmpeg -i videofile. mkv # 1. The setpts filter adjusts the presentation timestamp of video frames, effectively changing the speed of the video. I saw the bottleneck this time was the physical performance of the drive, so I just added drive letters to the files so one drive was reading the input file while the other drive was writing the output file, which jumped the speed up even more to 58x. This produces the desired result (and is much faster): ffmpeg -i input. You can make your filtergraph more efficient (maybe up to 2x faster) by eliminating the color filter and using hstack/vstack instead of overlay, but it would not help significantly because the bottleneck is the encoding on the CPU. Speeding up what i need is: x355347, but "set pts=0. mp4 -filter:a "atempo=0. 0" 02ff. mp4 -i audio1. mkv -r NEW_FPS -filter:v "setpts=0. mp3) do ffmpeg -i "%f" -filter:a "atempo=0. mkv -filter:a "atempo=2. 75*PTS" output. Jul 2, 2022 · Make the file size of my big video files smaller without significant quality loss. As you might recall, the ‘setpts’ filter adjusts the frame timestamps, which affects the playback speed. Open(path); // counter is beeing used to extract every Aug 30, 2017 · Aug 30, 2017 at 14:25. mp4 -o temp-video. mp4 The question is if I could always use this idea to produce html5 compatible video and if this method will actually speed up video conversion. For example, an 11 second video that originally showed an entire tennis forehand swing ends up stopping before the swing is completed. editor import VideoFileClip. mp4 Feb 27, 2019 · I am working on a project in which I need to speed up a mute video. speedx(factor=2) You can speed up or slow down audio with the atempo audio filter. To understand my changes p Jul 6, 2020 · In this case it will be 2 times slower and for the speed up it is now 50% faster. 5*PTS" faster. Help with MoviePy (increasing video speed without affecting audio pitch) I'm trying to generate a large amount of videos at different speeds, and have successfully altered video speed with the following method: from moviepy. What I don't want to get is this: mplayer -vf scale -speed 1. I made a timelapse out of an image sequence using ffmpeg and the copy codec to disable compression and keep the quality to a max. 7x speed up) : mplayer -af scaletempo -speed 1. 0" Aug 5, 2021 · Code1: Merge Videos. Your syntax generates two audio tracks, each doubled in speed. wav -c:a aac -b:a 128k output. The timelapse is a bit too long (10 minutes and up) so I tried to use this command to speed it up. To change the speed of audio atempo is the filter to use:-filter:a "atempo=2. Improve this answer. Recommended range ≥ 320Kbps Jan 14, 2023 · Speed up or Slow down the audioFor changing the speed of audio, use the atempo audio filter. 5 [music]; Step3 Use the amix filter to take the " music " stream and audio1. 5. I did a little digging around and found the following command. And with the framerate change: input video file-filter_complex. 5*PTS -shortest -y -preset ultrafast OUTPUT. I want to use ffmpeg to loop/repeat the audio track in this case. setpts=0. Video have 266 510 617 frames to encode. Share. Creating a mosaic/tile of screenshots from a movie Seeking and cutting sections of a video & audio Concatenating two video files or two audio files Sep 1, 2015 · For example, to speed up the video by 4 times, I run the following command: ffmpeg -i vid. mp4 -c:v libx265 -preset ultrafast. This command will extract the frames from the video and save them as separate image files. Loop playback of that part, Adjust the speed without changing pitch (I can play along at a slower speed). How do I dull them down? ffmpeg -i input. mkv -c:v copy slow-video. resulting video file Mar 5, 2014 · Using the setpts filter is the new way and is faster and possibly less lossy. Here are examples of both speeding up and slowing down a video. FFmpeg convert audio track and add back into media file without touching video track 0 ffmpeg - Strip specific audio track from multiple files with batch script Nov 4, 2023 · Changing the speed of the audio. ffmpeg -i 4K_Source. 0 and 1. the first 2 commands cut your video into 2 videos. -c:a aac -b:a 192k -pix_fmt yuv420p -shortest video. -filter_complex " \. wav output. the source Video is 1080p / 60fps (roughly 1GB per 5 Minutes of video). Command ffmpeg -i input. 117. Sorted by: 17. wav>. mp4 -x 4 Options --input, -i, <first arg> Input file to speed up [required] --factor, -x Factor by which to speed up [default=4] --fps Frames per second [default=60] --keepPitch Keep the same pitch of the audio . wav -shortest -r 25 v. 5x speed up command: ffmpeg -i input. Dec 11, 2022 · I am trying to speed up video using python. Their support will help sustain the maintainance of the FFmpeg project, a critical open-source software multimedia component essential to bringing audio and video to billions around the world everyday. Speed up a video. Mar 27, 2024 · Step1 Start the command by specifying the input files. Pipe that to a video player like FFplay or VLC. mp4 -filter:v "setpts=PTS/60" output. To install FFmpeg with support for libvpx-vp9, look at the Compilation Guides and compile FFmpeg with the --enable-libvpx option. Apr 15, 2019 · 15. This will open the program. 75 PTS to speed up the video will look like this: ffmpeg -i input. jpg -i audio. Is it possible to encode 4K asset in 1x writing speed ? Below are our encoding commands and details of CPU, source assets, and encoding command output: Encoding command. org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video. The slower the frame rate, the faster the video playback. raw video or video grabbers. The lower the PTS value, the faster the time-lapse video is generated. This command will double the speed of audio. mp4 -filter:v "setpts=2*PTS" output. 5*PTS" output. The audio seems ok but the video seems slow and therefore out of sync with the audio. Also I find while the framerate is 10，the video playback speed will be right. Recommended range ≥ 256Kbps; mp2 – usable range ≥ 320Kbps. Trying to speed up audio makes all the t's and s's really sharp. > >I tested it with speedups of 2. libvpx-vp9 can save about 20–50% bitrate compared to libx264 (the default H. The parameter for atempo must be between 0. using (var vFReader = new VideoFileReader()) {. Dec 12, 2013 · With this code, the video capture speeds up or slows down, but the audio doesn't. Apr 10, 2016 · Say I have a video exactly 25. mp4 -vf "setpts=PTS/0. 1 second video to slow down to exactly 24. source_video = VideoFileClip("source_video. To double the speed of the video, you can use: ffmpeg -i input. Step2 Use the filter_complex option to specify a filter graph. For most use-cases, it is way easier to keep the number of frames and reduce the image quality per-frame. I use ffmpeg to mix an audio file with a single photo to make a video with the following command: ffmpeg -loop 1 -i image -i audio -c:v libx264 -tune stillimage \. mp3" -shortest outPutFile. mp4 -filter:v setpts=0. May 20, 2020 · Refer to the ffmpeg log and look for the using cpu capabilities line. Since it is a single photo, I expected a quick process, but it works with speed=2x, which means it takes half of the duration Sep 7, 2023 · To double the speed of the video with the setpts filter, you can use: ffmpeg -i input. Use a faster x264 encoding preset. > >So I will package this into a speedchange script among the other video utilities >scripts I have created. 0*PTS[v];[0:a]atempo=0. The above example will extract the audio stream from the input video, slow it down by 2 and reencode it into an AAC audio file. I have tried two methods so far using Accord. Note that in the following examples, the audio stream is not changed, so it should ideally be disabled with -an. Previous message (by thread): [FFmpeg-user] Possible to speed up/down video while keeping audio pitch? Next message (by thread): [FFmpeg-user] Possible to speed up/down video while keeping audio pitch? fsup video. mp4 -vcodec copy -filter:a "atempo=0. FFMPEG wrapper: public void GetVideoFrames(string path) {. Sep 9, 2020 · However, FFMPEG seems terribly slow. To double the speed of a video Apr 25, 2015 · Use the "atempo" filter: ffmpeg -i input. Recompile x264 and ffmpeg without --disable-asm. 0 means double speed. This accelerating effect can be applied to either or both the audio and video streams within a film. 0. The filter PTS drops frames to achieve speed change and this change only applies to video not the audio. mp4 Parameters-i input. png. ffmpeg -i [input] -filter_complex "[0:v]setpts=2. mkv Sep 19, 2020 · I've read in different places about -speed and -deadline options for VP9 encoding with ffmpeg, they seem to control more or less the same aspect (compression efficiency to execution time ratio), bu I try speed up a part of video but when completed, the output has the wrong duration video, and it contain some freeze frames. The presentation timestamp (PTS) of each video frame can be modified to alter the pace of a video stream. m4a libtwolame – usable range ≥ 192Kbps. Create high-performance end-to-end hardware-accelerated video processing, 1:N encoding and 1:N transcoding pipeline using built-in > filters in FFmpeg. Aug 20, 2020 · 0. You can also add an audio file: ffmpeg -framerate 12 -i img%d. 8[a]" -map "[v]" -map "[a]" -vsync vfr -vcodec h264_qsv out. I wish to split a large avi video into two smaller consecutive videos. Make sure your ffmpeg and the linked x264 are not super old. The command re-encodes the setpts value to 0. You can speed up or slow down audio with the atempo audio filter. Follow. mkv -filter:v "setpts=PTS/2" output. 5 -p 2. Adjust video and audio Sep 5, 2017 · To speed up both video and audio: ffmpeg -i input. Recommended range ≥ 128Kbps Example of usage: ffmpeg -i input. News May 13th, 2024, Sovereign Tech Fund. Check out the official wiki for more methods including how to smooth Looks like ffmpeg will stick to the original duration unless you discard the audio track. If the video is 30 seconds long, the output file is accelerated. The higher frame rate is,the faster the video playback speed. ffmpeg -i temp-video. setpts. ffmpeg -i input_video. jpg and audio. out. But according to manpage of ffmpeg, I can make Jan 13, 2012 · 17. 5 - 100] Is there a workaround? We plug this into the -filter:v "setpts=PTS/" to give us the correct video time scaling for speedup or slowdown. "-t" option is for the duration of your edited video. mp3. To double the speed of audio: ffmpeg -i input. Jan 31, 2013 · Video quality can be controlled with -qscale:v, which for mpeg* video is a linear scale of 1-31 where 1 is the highest quality, or -b:v which takes a bitrate value in bits. From: https://trac. Confused Cod. 5 and 100. mp4 -map 0:v will copy the video from the first input file (video. The 2. Use both setpts and atempo to speed up both video and audio: ffmpeg -i input-video. Also note that the -hide_banner -v warning is simply to reduce logging information but you can remove it if you want. Here is an example that changes a video to 12 frames/second: mkvmerge --default-duration 0:12fps --fix-bitstream-timing-information 0 original-video. If you want to slow it down even more, you can use the atempo filter more than once. Feb 5, 2024 · Speed up and slow down videos using FFmpeg. This command gives me exactly what I want, but I need to save the result in file somehow. Not a good deal. mp4 will be your original video between 00:00:00 and 00:00:04 (4 seconds). 0"-vn output_audio. Syntax for binary is. atempo=2. 1. mkv Tried to use it in android as follows. I am currently using VLC to achieve this, but VLC can only slow down the audio/video within certain limits, 0. mp4 -filter:v "setpts=PTS*3" -an video_new_fps. mp4 -filter:a "atempo=2. Here is a simple one-liner batch file (you can just paste this all in as a command and not even use a batch file): for %f in (*. mp4 -filter:v "setpts=0. So as I was searching for the code to slow down the audio, I came across this link that provides the filter codes for speeding up or slowing down the video capture and audio. 5 and 2. or using filter and setpts: ffmpeg -i video. 67 bitrate=1574. Stream copy the audio instead of re-encoding it if the input audio Sep 15, 2020 · I am using ffmpeg to set the audio and video speed to 0. // open video file. will speed up video 2x. Here’s how to double the speed of a video using FFmpeg: ffmpeg -i input. 0 test. I need this to be done in file (file Hi, I have noticed in package missing speed change functional, I have added new functional to change speed for video and audio, now you can speed up/down video and audio. Apr 4, 2019 · pts = n * (（1 / timbase）/ fps) When I use this formula,I find a phenomenon. vFReader. This replicates the issue you're having (and is very slow): ffmpeg -i input. 2. -i video1. mp4. will speed up audio 2x-map "[v]" -map "[a]" map video and audio channels. mp4 -i input2. ffmpeg \. wav, the [A:B] syntax says to take the B'th stream from the A'th input (both starting with 0, so [1:0] is the 1st stream from the 2nd input, or audiofile. Apply this command: ffmpeg -i "videoFile. Which happens to be video. mp3 \. But the duration of the video remains the same. png -i audio. How to change the frame rate. 25*PTS" vid_fast. wav -shortest out. > >So it seems like one must apply the inverse factor on setpts and atempo, i. I am trying to convert a flv video to mp4 using a264, but the result video has a out of sync audio/video. I can set the video speed but can't set the audio speed to 0. avi -filter:v "setpts=0. You'll have to do the right math for the numbers, of course. 2*PTS" -an output. 25*PTS" -af "atempo=2. Also, since you're dealing with one input and one output, you can just use simple filters. aac. The audio filters should be chained one after the another. 7 myvideo. To speed up or slow down a video in FFmpeg, you can use the setpts filter. One way is to run ffmpeg two times: ffmpeg -i input. What can I do to keep a good quality in the output? Oct 6, 2017 · This ffmpeg will render video fine, out put like this. 3. e. 0,atempo=2. A line there mentioned that the filter code to slow down the audio and video capture at Apr 14, 2021 · Contributed on Feb 05 2023. Apr 9, 2020 · FFmpeg: is a cross-platform solution to record, convert and stream audio and video. I am trying to slow down a video+audio a little bit, using this FFMpeg command: ffmpeg. m4a aac – usable range ≥ 32Kbps (depending on profile and audio). applies specified video/audio complex filter. Use a value greater than 1 to slow down the video. 5" -vn output. The command to set the 0. I used -r 50 because that's what the Ffmpeg guide recommends in order to avoid frame dropping. mkv -filter_complex " [0:v]setpts=0. For the above example my ffmpeg command would be like: ffmpeg -i {input} -c:v libx264 -c:a copy ouput. 2*PTS[v];[0:a]atempo=0. 2 Hardware Decode Apr 8, 2019 · Audio is longer than video: ffmpeg -i INPUT. Now, the thing is I found somewhere that you can use this command to speed up the video. 666*PTS [v]; [0 From the man pages of ffmpeg:-s[:stream_specifier] size (input/output,per-stream) Set frame size. To install ffmpeg, use the following apt-get command: sudo apt-get install -y ffmpeg Import python libraries. What I'd like to achieve is getting the same effect as I get with (assuming 1. 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 May 21, 2015 · To preserve all the frames and just increase the frame rate by 4 times and speed as consequence exec: ffmpeg -i input. mp4 Slower Video Speed ffmpeg -i input. ffmpeg -i original_video. but this command gives lots of warnings like this: [mp4 @ 00000194a7089040] Non-monotonous DTS in Dec 17, 2022 · 1. Feb 20, 2023 · Play part of the video, from timestamp 1 to timestamp 2. 0 for audio. Here is the command. I'm speeding up a video by 2x with this command: ffmpeg -i input. pitch. mp3 -filter:a "atempo=2. Oct 1, 2019 · 1. It is really helpful for video lessons, where the professor takes long time for writing something on the board, makes lots of pauses, or just speaks slowly. 5 in "setpts=0. ffmpeg. mpg By default the audio encoder mp2 will be Aug 27, 2019 · So I think I could just copy audio stream into ouput video but still needs video stream conversion. # speed up video and audio at the same time # 2x speed up command: ffmpeg -i input. I am using ffmpeg. avi -vcodec copy -acodec copy -ss 00:30:00 -t 00:30:00 output2. On doing so, the audio finishes first and the video continues to play for some more seconds. -i in. 1 seconds long and a Windows computer with ffmpeg. apply specified video filter. 5*PTS" tells the video frames (technically their timestamps) how much to multiply by. The -vn is also important - it tells FFmpeg to skip the May 22, 2024 · To speed up the video, we multiply the PTS with a value less than 1. Is there a way to use ffmpeg to slow down or speed up a video based off a number I give to it? For example, I want the 25. I already the ffmpeg manpages but it's dazzling me with so many options. wav -c:a ac3 -b:a 160k output. 5[a]" -map "[v]" -map "[a]" [output] So, I tried this command to speed up and reverse the video, but it didn't work since complex filters can't be used together with -vf or -af. rubberband -t 1. Here’s how to do it: ffmpeg -i input. 3" output. frame=77590 fps=113 q=-1. mp4 -r 50 -vcodec mpeg4 -filter:v "setpts=0. 5" "output\slow_%f" Yet the file-size has only been reduced by 12 %. In this post, we will use FFmpeg to join multiple video files. Jan 8, 2024 · libvpx-vp9 is the VP9 video encoder for WebM, an open, royalty-free media file format. Speeding up/slowing down video You can change the speed of a video stream using the setpts video filter. You can use any value between 0. Video encode speed is about 250fps (low cpu and ssd usage). mkv -filter:v "setpts=1. Reply. mkv. 467" output-video. 68*PTS" -filter:a "atempo=1. wav -filter_complex " [1:0] apad " -shortest output. Today, we show how to speed up a video, using ffmpeg. 6[a]" -map "[v]" -map "[a]" output. ffmpeg -itsscale 1. mp4 -filter_complex "[0:v] [0:a] [1:v] [1:a] concat=n=2:v=1:a=1 [v] [a]" -vsync 2 -map "[v]" -map "[a]" output1. part-2. mkv Audio tempo is the inverse of the factor modifying frame timestamps. Replace input. Can I render video as specific speed ? 9. The order of options in the command line matters. Or you can use the standalone binary which works with WAV files. Unfortunately, the quality became that of May 6, 2022 · If I want to change the video speed with ffmpeg, what exactly is the difference changing the fps: ffmpeg -y -r 10 -i video. It seems that with both options I can speed up or slow down the video. 5*PTS [v]; [0:a]atempo=2 [a]" -map " [v]" -map " [a]" output. 959041" output. 25*PTS" output. Step1 Open a terminal and type in FFmpeg. With this program you can skip this boring parts and save time. 67x e. wav are your input, you can use the following command, adapted from the FFmpeg wiki: Mar 25, 2024 · [FFmpeg-user] Possible to speed up/down video while keeping audio pitch? Bo Berglund bo. 264 encoder), while retaining the same visual quality. The 0. where NEW_FPS = old_fps * 4. If it says none then you may be missing out on some speed. you can use the help of ffmpeg with the command Jan 10, 2017 · Faster Video Speed ffmpeg -i input. You will get a new file named outPutFile. will speed up video to double of its original speed This program, built with Electron, makes use of FFmpeg in order to speed up (or skip) parts of the video that are with no sound. 0 (so it can slow it down to no less than half the original speed, and speed up to no more than 100x the input). To extract the frames from the video, you can use the following command: ffmpeg -i "video_path" frame%04d. mp4 In a more general case, where image. ffmpeg -y -i video. As an input option, this is a shortcut for the video_size private option, recognized by some demuxers for which the frame size is either not stored in the file or is configurable -- e. MP4 While the video is sped up by the indicated amount, the duration of the video (as indicated under its properties, and also when I play the video in VLC) remains the same as the original. Then go to inside the folder where you have audio and video file. You can see speed=10. mp4 This eliminates the audio dropouts, but does re-encode audio. exe. mkv -filter:v "setpts=0. mp4 -vf "setpts=0. Encode time is to long ~12 days Do you have any other ideas? Speeding Up a Video. Sep 13, 2016 · ffmpeg -i input. 00000281415068*PTS " it's slow to. m4a -codec copy -map 0:v -map 1:a result. mkv -filter_complex "[0:v]setpts=0. mp4 (a merged file of audio and video) Share. input video file-filter:v. May 23, 2019 · FFMPEG Atempo - Speed Up and Slow Down AudioIn this video we go over how to use the ffmpeg atempo audio filter to speed up audio clips beyond 2 times speed a Image/video cropping Cropdetect and ffplay Speeding-up & slowing-down video Basic slide show from images Advanced slide show from images Thumbnails -Selecting specific frames : I-frame extraction etc. ffmpeg. May 1, 2011 · Open command promt ( windows + R -> Cmd + Enter ). wav extends duration by 50% and increases pitch by one whole tone (2 Feb 4, 2021 · If you are interested in keeping the number of frames, but squeezing / stretching the video, see: How to speed up / slow down a video. 625*PTS[v];[0:a]atempo=1. shortest = to extend audio streams to the same length as the video stream; In my case, shortest is not working. Jun 12, 2016 · Same result with vcodec substituted for codec, except that while video is not re-encoded, the audio is re-encoded at half the original bitrate and still has the dropout glitches. To speed up the video, we use a value less than 1. Jun 11, 2017 · For quality results, you need ffmpeg compiled with librubberband. The following works for my case: ffmpeg -loop 1 -i img. filter is used to change video speed . ffmpeg -i timelapse. 0 size= 596650kB time=00:51:43. ffmpeg -i input. 2) Some of the videos were truncated at the end. mp4 -itsoffset 5 -i video. mp4 -map 0:v -map 1:a out. My command: Sep 12, 2021 · I am using the latest version of FFMPEG and am trying to slow video and audio by half Hey, I have an idea to speed up timelapse videos based on the audio waveform and I don't know how to do it with FFmpeg Thanks Jan 17, 2023 · Learn how to quickly and easily add audio to video using FFmpeg! This video tutorial will walk you through the steps of combining audio and video files using the powerful command line tool FFmpeg. 0" -vn output. If I use ffmpeg -re , it render as speed=1x , good for CPU but take time. 3*PTS" "SlowVideo25. Jan 30, 2020 · 4. Source: FFmpeg - how to speed up / slow down a video. The FFmpeg community is excited to announce that Germany's Sovereign Tech Fund has become its first governmental sponsor. asked Mar 16, 2020 at 17:22. 8kbits/s speed=10. Apr 13, 2017 · In the above link, Mulvya show us how to speed up a video, but I want to know, if possible, how can I speed the video joining two or more videos and increasing the frame rate, for example: I have 2 video files, which I need to join. mkv The atempo filter is limited to using values between 0. wav> <outfile. mp4 I'd like to find a happy medium (smaller file size but faster encoding) keeping the video scale size close to the original. e. And finally we use -filter:a "atempo=" to get the equivalent audio scaling. [0:a] volume=0. avi. 3" -r 50 -c:v mpeg4 -b:v 1500k -af "atempo=0. mkv -i outw6ms. The following user guide shows how to use the FFmpeg command line to efficiently use the AMD hardware acceleration for video decoding, encoding, and transcoding. 25 and both worked OK. 5x 0. com Mon Mar 25 08:04:37 EET 2024. Aug 31, 2023 · We can easily speed up a video using the setpts filter in FFmpeg as follows. mp4 -vf setpts=PTS/60 -an output. – This method is very slow and speed up is too small. 75, speeding the video playback and making the length 15 minutes. avi -vcodec copy -acodec copy -ss 00:00:00 -t 00:30:00 output1. mp4)-map 1:a will copy the audio from the second input file. mkv I tried the result in AvsPMod with waveform() and the audio is in perfect sync with the source - from beggining to end. mp4" -i "audioFile. -x265-params fps=60:profile=main:min-keyint=60:crf=19 -vf "scale=3840:2160". 0427083 -i input. I have no idea how to fix it. mp4 -i audiofile. A little bit is ok (compress videos) @DarkDiamond. 300000 for parameter 'tempo' out of range [0. MP4 -filter:v "setpts=0. Oct 14, 2018 · The resulting video is only 30fps, which means the conversion process dropped the vast majority of frames - I'd like it to actually be a full 240fps. mp4 too, but delayed 5 seconds by the use of -itsoffset right before the corresponding -i option. To check the frame rate: ffprobe video_name. 3*PTS" timelapse_fast. May 18, 2020 · Then, I remuxed the resulting audio with the transcoded video directly in ffmpeg: ffmpeg -i encvideo. If you use a larger value, the video will display in slower motion. crf is a quality setting. According to NVIDIA's developer website, you can use GPU to speed up the rendering of the ffmpeg filter. ffmpeg just has so many different parameters / switches that it's difficult to wrap my head around what I should be doing. mkv -vf "setpts=0. mp4") sped_up_video = source_video. I am trying to use ffmpeg to slow down a video speed by 25% (75% speed) without changing the audio speed. 0. 5*PTS. Let’s import the required python libraries. 5*PTS" -filter:a "atempo=2" output. g. ffmpeg -i 02. The -filter:a applies an audio filter, atempo, which changes the speed. 0 Answers Avg Quality 2/10. mp4 video_new_fps. Ability to add your own custom high-performance CUDA filters using the shared CUDA Apr 1, 2024 · AMF is effectively supported by FFmpeg to significantly speed up video encoding, decoding, and transcoding via AMD GPUs. mp4 However, the output quality is very low. If the video contains audio you can also slow that down without changing the pitch, but it is not a lossless conversion. wav above). 51x , It's fast but but it take all of my CPU. slow. There are two ways to change the output frame rate: With the -r option used as an output option With the fps filter; There are differences in implementation of those two: Not sure if the audio part matters, but now it gets 22x processing speed while only using 5% CPU. To split a video into frames and then reassemble it with the audio, you can use the ffmpeg command-line tool. berglund at gmail. The filter works by changing the presentation timestamp (PTS) of each video frame. exe -i video. audio. Video file and audio file, both are different and then after Apr 27, 2023 · 1. To speed up your video from 1x to 5x, you can type: ffmpeg -i input. 5*PTS" -an output. mp4 with the path to your source video file. Jul 22, 2022 · ffmpeg -i input. 3x. mp4 I want to set audio's length same as video's length. Here is the command I am running: /opt/local/bin/ffmpeg -i complaint. mp3 and mix them. Mar 27, 2024 · The Ultimate Step-by-Step Guide to speed up a video in FFmpeg. To check number of frames: Nov 22, 2019 · ffmpeg does not want to overwrite the file it is currently working on, so the easiest option is output in another folder. mp4 -filter_complex "[0:v]yadif,framerate=30,setpts=1. mp4 -vcodec libx264 -preset fast -c:a copy -s 960x540 output. rubberband -t <timeratio> -p <num_semitones> <infile. Stack Exchange has a good overview to get you started with FFmpeg. Both are at 30fps and I want to speed up to 5 times and increase the frame rate to 60fps. Step2 Drag and drop the video file onto the window. This assumes the audio you want is in the first stream of audiofile. But the problem is that the duration of the video output is not reduced based on the speed we provide. ff sn ef zq ll xb ox fl fv ty