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Space - falling faster than light? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Open Windows Powershell from the start menu, and start with the compression command-line in FFmpeg. Posted by George Shelley - Feb 24, 2022 | Contact Author. Step 2 Customize video compression settings For example, an AVI video file might still be larger than the small file of MP4 type despite being a small size. You have to use H.264 encoder. Bit rate size is directly proportional to file size, and thus, reducing one will reduce the other as well. When the video compression completes, the output video file should appear at your specified location. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. When the Littlewood-Richardson rule gives only irreducibles? If youre targeting a specific file size (or bitrate) rather than a specific quality, you'll need to use a two-pass average bitrate encoding (or 2-pass ABR for short) to fit the video within this size without reducing the quality too drastically. First of all, download FFmpeg and launch it on your computer. In this tutorial, we will use the x265 codec. Bit rate is a combination of multiple factors. How do planetarium apps and software calculate positions? A high-resolution file will have good quality and larger file size. Export your video in high quality works batter in mp4 videos. What is rate of emission of heat from a body in space. ( I can reduce it after it is written, however that won't do the trick for me. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. -crf use for reduce the size of video and -preset is use for decrease conversion time. (clarification of a documentary). Use ffmpeg -i input.avi -vcodec libx264 -crf 24 output.avi, a 1GB video can be compressed to 200MB. Making statements based on opinion; back them up with references or personal experience. CRF (Constant Rate Factor): set the CRF to lower the bit rate but retain better quality. You can tell scale to provide even value by using, Not working. At the first pass we'll choose a suitable Constant Quality Mode compression (crf parameter) as a start point: You can add slow_firstpass parameter to the -x264encopts if you are paranoid with the final quality of the video. ffmpeg -i input.mp4 -vcodec libx265 -crf 20 output.mp4. Esta aplicacin ayuda a convertirse en un usuario avanzado de Windows mediante la automatizacin de tareas recurrentes utilizando la lnea de comandos. ffmpeg change resolution. However, many tools, such as VLC and Handbrake, all share one engine: https://www.videolan.org/developers/x265.html, https://slhck.info/video/2017/02/24/crf-guide.html, How to Create a New File Using Linux Touch Command, Nmap: Scan Ports To Detect Services and Vulnerabilities. Calculate your bitrate using bitrate = target file size / duration Target file size in kilobits. Making MTS video file smaller using FFMPEG, ffmpeg zoompan image to video with original sizes. It only takes a minute to sign up. How to significantly lower a video file size with ffmpeg without quality loss? Search for jobs related to Ffmpeg reduce video dimensions or hire on the world's largest freelancing marketplace with 21m+ jobs. Unless you're looking for a specific bit rate, I'd recommend the -crf option. Answers Courses Tests Examples ffmpegmp4yuvffmpeg -i 1.mp4 1.yuvyuvffplay -f rawvideo -video_size 1920x1080 -i 1.yuvmp4h264ffmpeg -i 1.mp4 -vcodec copy -bsf h264_mp4toannexb -f h264 1.h26410s1s,ffm Here is a straightforward guide on changing the resolution of your videos using FFmpeg. When i'm scale down images, filesize have big drop but for video, nothing changes. ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -acodec mp3 output.mp4. #!/bin/bash It is available in the repositories of major Linux distributions. Why is the rank of an element of a null space less than the dimension of that null space? How to resize a video to make it smaller with FFmpeg, https://ffmpeg.org/ffmpeg.html#filter_005foption, Stop requiring only one assertion per unit test: Multiple assertions are fine, Going from engineer to entrepreneur takes more than just good code (Ep. For example, if your phone can only display a 1080p picture, sending it a 3840x2160 video is just wasteful. The solution to Ffmpeg Shorting Media Size will be demonstrated using examples in this article. It was 2X to 4X faster. Here you will find the "Why" and how to downscale 4K to 1080P (in smaller file size, unaffected visual quality) with VLC, online converter, and EaseFab. Used it on an 18s 4K video from Pixabay and the result was a 30% reduction in size without any noticeable reduction in quality. 17015 kb/s, 29.99 fps, 30 tbr, 90k tbn, 180k tbc (default) . ideally something made with agpl (even if ffmpeg still haven't done it themselves. The (SZ) method is definitely the quickest method. What is the function of Intel's Total Memory Encryption (TME)? Is there an industry-specific reason that many characters in martial arts anime announce the name of their attacks? Click 'OK to confirm. All the answers here are for reducing the compression quality but nobody has mentioned reducing video frame size. Another solution to reduce the size of the video file is by trimming and cutting its unwanted parts. Much better if I create output.mp4, not avi. For example for a target size of 1GB (one gigabyte, which is 8 gigabits) and 10000 seconds of video (2h46min 40s), use a bitrate of 800000 bit/s (800kbit/s): Additional options that might be worth considering is setting the Constant Rate Factor, which lowers the average bit rate, but retains better quality. If the video doesn't include fast action scenes, you may want to lower the frame rate. The best answers are voted up and rise to the top, Not the answer you're looking for? Space - falling faster than light? FFmpeg, an open source free video transcoder, can make this done indeed. To make the best decision in video compression, we implement a simple equation. Below, we'll explain the details on how to do these. This guide will show you how to work with FFmpeg: FFmpeg is a fully featured command-line utility for handling multimedia files. 3.6 Gb to 62 Mb, quality "good enough"/acceptable. Now, FFmpeg is running to do the video compression job. Steps to reduce video size using ffmpeg (for Mac M1) 1) Install homebrew 2) Install ffmpeg 3) To reduce the video resolution of mp4 file to half, using the follwing line 4) To convert .mov to .mp4, using the following line References Off the top of my head i think it writes a tmp file derived from $1. It's free to sign up and bid on jobs. In short, for the same bitrate it achieves a better quality than a single-pass bitrate encoding (as demonstrated in this answer), because the first pass allows the codec to allocate bit usage based on needs, i.e. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Con esta aplicacin, puede generar archivos por lotes personalizados para doce casos de uso comunes. So extension matters. Basically the audio streams will pass through. ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4, Command-line - Compress and Convert MP4 to Webm for YouTube, Ins, Facebook Shrink large videos to smaller sizes with simple clicks. Is it possible for a gas fired boiler to consume more energy when heating intermitently versus having heating at all times? So i'm tried to reduce video filesize by scale down video -vf 640:-2, but nothing changes. To make the best decision in video compression, we implement a simple equation. The video processing progress is showing at the bottom. It would be best to half its size to 1080p. Connect and share knowledge within a single location that is structured and easy to search. Is there any improvement for less execution time. ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4 Level up your programming skills with exercises across 52 languages, and insightful discussion with our dedicated team of welcoming mentors. Using FFMPEG is also very simple as follows: ffmpeg -i input.video output.video. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This is common when you are only manipulating the video stream. Option - Compress videos by Trimming and Cropping Unwanted Part of Video. Therefore, it's difficult to get to know how to use FFmpeg for video compression. this will help almost all type of video. {avi,flv,m4v,mov,wmv,mp4,MP4,TS,mkv}; do ffmpeg -n -loglevel error -i "$i" -vcodec libx264 -crf 28 -preset faster -tune film "cc${i}"; done, Handbrake is an open-source alternative with a UI. Needed on macOS: to preserve compatibility encoding H.265/HEVC for QuickTime. Answers related to "ffmpeg reduce to 8 mb". Download FFmpeg and finish the setup process on your computer. For example, The (CR) method took 53 minutes to convert the 21 minute video. Step 1. Consequences resulting from Yitang Zhang's latest claimed results on Landau-Siegel zeros. The range of the CRF scale is 051, where 0 is lossless (for 8 bit only, for 10 bit use -qp 0), 23 is the default, and 51 is worst quality possible. Step 3. This is an example of what I mention in "Correct (or best) Answer". If you have HD videos with a high resolution of 1080P, you can reduce it to a lower resolution to reduce the file size. Scale down or up doesnt affect video filesize. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. This answer is under-rated. up to 4K quite easily by changing the 3 elements, say adjusting video parameters, converting coding format and cutting unwanted parts being the factors that determines the size of a video file. How to help a student who has internalized mistakes? Follow my content by subscribing to LinuxHint mailing list, Linux Hint LLC, [emailprotected] ffmpeg -y -i "$1" -c:v libvpx-vp9 -pass 1 -deadline best -crf 30 -b:v 664k -c:a libopus -f webm /dev/null && ffmpeg -i "$1" -c:v libvpx-vp9 -pass 2 -crf 30 -b:v 664k -c:a libopus -strict -2 "$2". Unfortunately, this benchmark compares apples to oranges. There are three output files specified, and for the first two, no -map options are set, so ffmpeg will select streams for these two files automatically.. out1.mkv is a Matroska container file and accepts video, audio and subtitle streams, so ffmpeg will try to select one of each type. Impressively reduced a ~2G video to 14MB, still looks good, this was the first search result and it's exactly what I was looking for, thanks! Starting with SZ and ending with CR makes sense. You should try several values for crf . We have explained how to fix the Ffmpeg Shorting Media Size problem by using a wide variety of examples taken from the real world. In that case you should use a newer ffmpeg, which you can download as a static build, or compile yourself. I personally used that. It significantly reduced both the size and speed of the encoding. "bitrate" - bitrates of original and converted videos. Note that it seems that ffmpeg already performs some optimization when ran without options, so before trying to use settings you don't understand or deciding to explicitly lose information, give a try to a default conversion: In my case it reduced the bitrate of both the video and audio (you can check and compare the input and output file by running ffprobe on them), transforming a 700Mb video into a 60Mb one of seemingly similar quality. very curious to know: why libopus? 2. Note you'll use the same video input, not the generated by the first pass first pass' output video is only useful to check the initial quality. Next, we just open up a terminal window (or cmd prompt on Windows), and fire off: ffmpeg -i input.MOD output.mp4 That's it. The simplest tool to reduce the file size of MPEG-4 multimedia format video is ffmpeg. Here we take some typical command-line examples to show you how to compress MP4/MOV/4K/MKV video size using FFmpeg. The range of the CRF scale is 0-51, where 0 is lossless (for 8 bit only, for 10 bit use -qp 0), 23 is the default, and 51 is worst quality possible. Finding a family of graphs that displays a certain characteristic. For example, in this case, FFmpeg compresses the file from 7 GB to 26 MB. Be aware that changing the resolution always requires reencoding, so all the ins and outs of the other answers apply here as well. Asking for help, clarification, or responding to other answers. Click one of the links below to jump straight to your most interested part. These options are frequently used for reducing video size in FFmpeg. Does subclassing int to forbid negative integers break Liskov Substitution Principle? ffmpeg -i input.avi -vf scale=1280:720 output.avi. The downside is you also lose a large amount of quality because less pixels mean less image details. Tips: compressing 4K UHD videos in FFmpeg is CPU intensive, you'd better shut down other programs running background on your device. Can lead-acid batteries be stored by removing the liquid from them? ffmpeg -i input.mp4 -vf scale=-1:720 output.mp4 The resulting video will have a resolution of 1280x720. We select a small-sized container with a good codec to encode the video, low fps, and low bitrate. You can lower the resolution more if that is not something that concerns you. Copyright 2022 EaseFab Software Corporation. Try using, i found other answer on website, he's said that resolution and codec are two different things, to reduce file size you must use better codec, in this case i'm using libx265, yes, -c:v libx265 -crf 25 -x265-params profile=main10 -preset fast -pix_fmt yuv420p10le with this, quality is better and file size is lower but encode time is longer, -vf scale is just for visual, not for size/quality. -b:v: video bitrate How is the data shared from pass 1 to pass 2? Check how to use Handbrake to compress MKV video file size. On the other hand, low values will also result in high bitrate producing high-quality videos at the expense of file size. Use the following command: ffmpeg -i input.gif -pix_fmt yuv420p output.mp4 Replace input.gif with the source filename and output.mp4 with the desired name for the new file. You can use -crf option to reduce final video size. ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4 ffmpeg -i input.mp4 -b 800k output.mp4 Is a potential juror protected for what they say during jury selection? Go to the Video Compressor option, and click on the + sign and the file explorer will open up. ok thank you, i will try that, hope quality is same and encode time is reduce, look like ultrafast = higher size, not reduce size at all, should fast or slow. First, We have to demux the audio with mplayer: In the next steps, we'll do a 3-pass compression with mencoder. converting mp3 with FFMPEG. How can you prove that a certain file was downloaded from a certain website? To use it, replace the libx264 codec with libx265, and push the compression lever further by increasing the CRF value add, say, 4 or 6, since a reasonable range for H.265 may be 24 to 30. I've read ffmpeg wiki about Scaling but it dont have any information about scale and filesize. Specify whether to select the grabbing area . See the ffmpeg docs on scaling for more info. Not the answer you're looking for? Previous Post Next Post . Step 3. Step 2. This is because 1080 / 720 = 1.5. Just leave that command out and maybe use a preset like medium or slow and not ultrafast like you have right now to get a . You mentioned wanting to reduce filesize to fit more videos on a mobile device, which is my usecase as well. For many novice users, FFmpeg is not easy to get started. Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, @Wolfpack'08 - I have seen size increased with the second command of accepted answer when the input video was. (e.g. Sci-Fi Book With Cover Of A Person Driving A Ship Saying "Look Ma, No Hands!". Use FFmpeg to Reduce Video Size (Compress) To compress videos, we apply a basic technique. In this article, we'd like to show you how to use FFmpeg to compress video size without sacrificing (much of) its quality on Windows (Windows 11 included) PCs, also the best FFmpeg alternative to reduce video size without quality loss in a more effective way. ffmpeg resize video. So, let's take a look at how it shrinks video file size. -1 can also be used for width if you provide a given height. (from 10Mo to 1.2Mb, ffmpeg auto converted my video which was in, This increased the size of my video from 10.8MB to 14MB. This is a very easy-to-use software that can help you reduce the videos to a certain size and adjust the video format, resolution, bitrate as FFmpeg. rev2022.11.7.43014. How to do this was not yet discussed. However, to compress files efficiently, we need to use codecs, bitrate, container, and fps. Thanks for contributing an answer to Stack Overflow! You need to show all the information about your video both before and after your attempt to reduce its size. see, It works. The lower crf, the higher the bitrate. If the source video does not have an audio track, then omit the -c:a and -b:a arguments. Consequences resulting from Yitang Zhang's latest claimed results on Landau-Siegel zeros. lets say reduce the width/height to half you can do -, Static build can be downloaded from - https://johnvansickle.com/ffmpeg/, Documentation : https://ffmpeg.org/ffmpeg.html#filter_005foption. Command-line -Set CRF in FFmpeg to Reduce Video File Size ffmpeg -i input.mp4 -vcodec libx264 -crf 24 output.mp4 Command-line - Reduce video frame size to make 4K/1080P FHD video smaller ffmpeg -i input.avi -vf scale=1280:720 output.avi Although using custom compression options can produce good results, using the default FFmpeg options might work better in some circumstances. You can either reduce information content or increase compression. Execution plan - reading more records than in table, Concealing One's Identity from the Public When Purchasing a Home. Vary the CRF between around 18 and 24 the lower, the higher the bitrate. It's a 100% clean and safe software to fullfill common video compression and conversion needs, especially for those newbies who are not skilled with software or computer. Why should you not leave the inputs of unused gates floating with 74LS series logic? I'm not using ffmpeg, but mplayer and mencoder. Can plants use Light from Aurora Borealis to Photosynthesize? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Commands using Linux with ffmpeg to shrinking big MP4 video file to smaller sizes. Use the command ffmpeg -i video_1920.mp4 -vf scale=640:360 video_640.mp4 -hide_banner. This article introduces three ways to reduce the size of MP4 video files by reducing resolution, video and audio bitrate or converting MP4 to other formats as you like. Can you say that you reject the null at the 95% level? Connect and share knowledge within a single location that is structured and easy to search. To install it, use the following commands: Selecting the correct codec, container, and format can be very challenging when converting multimedia files. 1 MB = 8192kb Split the bitrate between video and audio, about 3/4 video, 1/4 audio. Update 2020: This answer was written in 2009. Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The test data conclusions are below. Here, as a superb video compressor for Windows and Mac, it can help downsize videos including but not limited to MP4, MKV, WMV, MOV, M4V, MTS, etc. Thus users are trying to reduce video size while converting the video format. But when converting for a small device this may be acceptable. Input video compression command-line. How can I make a script echo something when it is paused? Free download EaseFab Video Converter on Windows or macOS, install and launch it on your computer. Here're 3 methods to convert 4K video from HDR to SDR in 1080p/4K for free on Windows (10) or Mac. Duration in seconds. First, we need to install FFmpeg. A planet you can take off from, but never land back, Automate the Boring Stuff Chapter 12 - Link Verification. To compress videos in FFmpeg, you should make sure the command-line is right. Alternatives for the veryslow preset are slower, slow, medium etc. After the first pass, you'll note that the last line gives you the average bitrate you will use at the next steps: Change the crf parameter, recommended at the first pass, to bitrate, required at the subsequent passes: This second pass encoding will read the statistics generated at the first pass (divx2pass.log and divx2pass.log.mbtree) in order to optimize the compression. ffmpeg -i input.mp4 -vcodec libx264 -crf 24 output.mp4, Command-line - Reduce video frame size to make 4K/1080P FHD video smaller So, I would recommend against it. rev2022.11.7.43014. Privacy Policy and Terms of Use. Changing Bitrate: The size of the video file can be decreased by lowering its bitrate. For the high-def sample, the (CR), (BL) and (DF) methods all INCREASED the size of the video. a cleaner way of collecting "all video files" without having all the extensions in the command, a cleaner way to output the filename without "cc" prefix, AND being able to confirm video before deleting, Nowadays (2020), youll probably replace the, Set whatever options you want for audio encoding. For example, an AVI video file might still be larger than the small file of MP4 type despite being a small size. Name for phenomenon in which attempting to solve a problem locally can seemingly fail because they absorb the problem from elsewhere? To explicitly specify the container format, use the -f command-line option: -f mp4 or -f webm. and reduces significantly the video quality, even with /2. If he wanted control of the company, why didn't Elon Musk buy 51% of Twitter shares instead of 100%? ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4. For more detailed guide, check for this post "How to Install FFmpeg on Windows". When it comes to video files, not all are created equal. disclaimer: i look for the best free video format ideally something made with agpl (even if ffmpeg still haven't done it themselves talk.ahoxus.org/notice/AHZ626fsOe14jNUcng#ffmpeg). Before we begin let's first get some statistics about our sample mp4 video file foo.bar. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Stack Overflow for Teams is moving to its own domain! FFMPEG video to FLV conversion optimization. If you want to scale based on input size e.g. In short: a constant rate factor (CRF) of 23 would make a DVD quality movie (~700MB - 1GB) and lower CRF values would be higher quality (larger files). Among 3 ways listed here, it is the most efficient way to keep video quality and simultaneously reduce video size by converting videos via HEVC.. First, open the command line window and "cd" into the Storing Path of the Video you want to resize. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Can lead-acid batteries be stored by removing the liquid from them? My name is John and am a fellow geek like you. To use FFmpeg to resize the video, click on the 'File' menu at the top-right corner of your interface. Please help me find a way to reduce the size of foo.mp4 as it is being written down to the disc. how about a fixed size but keep the aspect ratio? Compress a batch of videos together to save your time. If your other settings are ok and reducing the output-video-size, you won't need the -fs option to crop. Most relevant ones (2020) are, check the size of the generated videos and pick the one you want. The (SZ) method is definitely the best method if the definition of the video is larger than the definition of the screen that will be displaying it. Handbrake is a popular open-source video transcoding program that can be used to compress MKV video files on Windows (10) and Mac. Pretty hard coded but it really puts on the squeeze Click on the 'width' box, key in your preferred video width. This can be very much an issue on high-def videos, since all of the other methods took longer to convert than the actual length of the video! UNIX is a registered trademark of The Open Group. ratetol controls the bitrate variation I'm not sure if I'm doing the right thing here, but I set it to the maximum value in order to let total freedom to mencoder to choose the right bitrate for each scene. In these examples, the size is divided by twice the value and multiplied by two to ensure the pixel size is a multiple of two, which is required for some codecs including H265. Stack Overflow for Teams is moving to its own domain! I shared with my colleagues and everyone found it helpful. Also the file size can be reduced significantly. How to help a student who has internalized mistakes? Check for the output video file size and figure out the FFmpeg video compression ratio. I compressed a 40-minute HD video presentation from 505MB to 183MB Here's an adaptation for other kinds of videos (courses, etc). How can I reduce a video's size with ffmpeg? See this blog post (or this archived one) for an enlightening explanation, and ffmpegs wiki about H.264 for a more synthetic how-to. You can learn more here: https://www.videolan.org/developers/x265.html. In addition to what Garrett mentions: -fs option will force the video to stay below the requested max-length. I use following commands to do rescaling for videos and images. ffmpeg -i input.avi -vf scale="720:-1" output.avi. Why are UK Prime Ministers educated at Oxford, not Cambridge? EaseFab Video Converter provide 3 common ways to help you compress MP4 video size. How can I extract audio from video with ffmpeg? Do we still need PCR test / covid vax for travel to . (AKA - how up-to-date is travel info)? What is the use of NTP server when devices have accurate time? Using FFmpeg, we can compress the file using the command: Once the file compression process has been completed, the file size should be considerably smaller. The best answers are voted up and rise to the top, Not the answer you're looking for? In such cases, you may want to limit the complexity of the decompression by restraining the profile via. it can spare bits on easy frames and have more available to spend on more demanding frames. Compress 4K MKV videos to 1080p to reduce MKV video file size. The frame rate is directly related to file size, and thus, reducing one will directly affect the other. Why bad motor mounts cause the car to shake and vibrate at idle but not when you give it gas and increase the rpms? To make your video compression easier and more efficient, you can adopt EaseFab Video Converter for help. "reduce file size ffmpeg" Code Answer ffmpeg reduce video size shell by alejandro.javier on Feb 25 2021 Comments (2) 1 xxxxxxxxxx 1 $ ffmpeg -i " [inputName.mp4]" -vcodec [libx265] -crf [28] " [outputName.mp4]" 2 # vcodec: libx265 for HVEC or libx264 for H.264 3 Why was video, audio and picture compression the poorest when storage space was the costliest? Start with the command-line examples below using FFmpeg. All Rights Reserved. Using the CRF of values between 0 and 51 should provide the best compatibility for x265 codecs. 4. What are some tips to improve this product photo? 4. For details, go to guide of how to trim video to learn more. Problem in the text of Kings and Chronicles. Still, a substantial reduction in movie frame size will almost certainly result in a much smaller file, and is possibly the single best tradeoff you can make to reduce file size. In the trend of HD and 4K, videos seems to get larger and larger, while the Internet bandwidth and our hard drives don't always match with the big size. Execution plan - reading more records than in table. There is no universal way to reduce a video file size because various file types are not created equal. Is this homebrew Nystul's Magic Mask spell balanced? Really useful if you make videos and want to manage them effectively.#ffmpeg #reduce #si. 3. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Moreover, it works behind the scenes with many multimedia tools. Alternatively you can set the display aspect ratio to whatever you want, thus: You can use '-preset ultrafast' for decrease conversion time. 1309 S Mary Ave Suite 210, Sunnyvale, CA 94087 For example, to re-encode with the, Pick the container format of your liking. Connect and share knowledge within a single location that is structured and easy to search. -f is used to explicitly specify the container format, -f mp4, -f wmv, -f webm, etc. How to Use FFmpeg to Reduce Video Size ffmpeg scale but keep aspect ratio. It is simple in interface but comprehensive in functionality. If using -fs anyway, beware of its danger and check your output, assuring it contains the end of the movie. (clarification of a documentary). How does FFmpeg reduce video size? In many cases it can reduce the file size of a .gif by a factor of 100x or more. FFmpeg contains a set of shared multimedia libraries such as libavcodec, libavutil, and libavformat. 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ffmpeg reduce video dimensions