Ffmpeg reduce video resolution

there other output? Magnificent idea and..

Ffmpeg reduce video resolution

When it comes in compressing the video, there are many options which can be adopted.

How to reduce video file size with FFMPEG from Linux Terminal

The most basic and effective one is to decrease the bitrate of video. Changing bitrate will result in decreasing the quality of video, thus will reduce the size of video. Decreasing the quality of video will help you in easily transfer the file over the internet. Lower size video will consume less bandwidth and transfer faster than large size videos. The highest quality video having highest bitrate value is 4K as of writing this today.

Not 3D of course, but talking in terms of quality. Similarly, the least quality video having lowest bitrate value is P and it looks good on small screens only.

In fact, there are very few devices with such small screen are left today. So in the near future, this quality most probably be removed at all from the quality format table. Usually you want high quality video to compress to lower quality. Decreasing the resolution of video is useful especially when you wanted to view the video in small screens.

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For example, you have a video in x resolution and you wanted to see this in mobile phone. Playing such high resolution video in mobile devices sometimes makes the device run slow, since not all mobile phones have such high processing speeds. Moreover, playing the video in x resolution is enough to view it in high quality in small screens.

There are some phones which can play x video seamlessly. When it comes to uploading the video on YouTube, it is recommended to upload the video to at-least P which means the video dimension must be at-least x So if you have any device that can record 4K video, Macbook Pro or Panasonic or DSLR, you can create the video in 4K but later can reduce the resolution to or P without having the fear to lose the quality of video. Now we need to create a page that will process this request.

Now you can run the script in your browser and you will be able to change the resolution of selected video file. When you reduce the resolution of video, then it may have a slight effect on video size. For example, x video will be compressed to x but the size of video may have been reduced to just 2 or 3 MB.

This is because changing the resolution does not reduct the quality of video, it just convert the high resolution video into low resolution. This is useful when you wanted to see the videos in small screen or when you wanted to share your video on social network. I have also attached all the source files below, make sure you download them and let us know if you face any issue.

View all posts by adnanafzal I blog quite often and I genuinely thank you for your information. The article has truly peaked my interest.

Compress video in bitrate and resolution – PHP & FFmpeg

It will be saved in the root directory. I really like your blog. Did you make this website yourself or did you hire someone to do it for you? You must be logged in to post a comment.FFmpeg has got a very powerful scale filterwhich can be used to accomplish various tasks.

Some of them are listed here. More can be found in the official documentation. If you need to simply resize your video to a specific size e. As you can see, the aspect ratio is not the same as in the original image, so the image appears stretched. If we'd like to keep the aspect ratio, we need to specify only one component, either width or height, and set the other component to For example, this command line:.

ffmpeg reduce video resolution

Some codecs require the size of width and height to be a multiple of n. You can achieve this by setting the width or height to -n :. There are also some useful variables which can be used instead of numbers, to specify width and height of the output image. Sometimes you want to scale an image, but avoid upscaling it if its dimensions are too low. This can be done using min expressions:. The output width will be evaluated to be the minimum of and the input width. If you have an imput image that is only pixels wide, the result of the min function will be — this will be your target value.

Sometimes you need to scale the input image so that it fits into a specified rectangle, e. It has two possible values:. This allows you to force the image to fit into a x box, downscaling it with the correct aspect ratio:.

You may have additional constraints such as adding black bars pillar- and letterboxing to fill up the remaining space when scaling to a certain rectangle.

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You can additionally add a black border using the pad filter:. For example, to use bilinear instead of the default bicubic scaling:. See the scaler documentation for more info.Reduce the file size to help store larger files, and continue to increase the number of files in the collection easier. Some methods of doing this are more effective than others.

Saving videos on personal storage, cloud services, or drives can be difficult when space is limited. There are many tools to choose from in the field of video processing, capable of optimizing file size. Most importantly, FFMPEG can convert videos at a surprising rate, allowing quality to be maintained at a high level, while file size is halved or even a quarter of a few.

Please execute the following command:. However, to really reduce the size of the video file in an optimal way, you need to consider the properties of certain file extensions. When it comes to video files, not all are created equal. For example, avi file extensions tend to be much larger than mp4 files. This leads to the logic built into the intended container environment, but can be modified by choosing the appropriate codec to encode files, prioritizing quality at large sizes, or portability with smaller sizes.

It is worth mentioning that the size of a particular video in mp4 format will always be smaller than the avi format of the same video, but there is a change in size and quality between these file types.

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Interestingly, though, mp4 is not the most perfect small file format. Here is part of the simple equation that we can use to get very small but high quality video files:. Note : For the purposes of this article, "high quality" means discoloration or pixelation created by displaying a bitmap or part of a bitmap in such a large size that it is visible.

Loss of quality is inevitable to some extent, if you really want to optimize the file size. However, how this affects depends on what you are optimizing.

The options are rich in the video and container codec world, so we'll keep things simple using WMV 8. When running FFMPEG, it will convert your input video to the specified file type, using parameters set with special flags. Here is the example code:.

The above code converts the example input file into a file with a bit rate of 1Mbps, a frame rate of 24fps, CRF Constant Rate Factor of 19 and the extension. Change 'input. Its complete set of features is impressive and there are many ways other than video conversion. Check the project's official website for more information at:. Home Technology Linux. Please execute the following command: sudo apt install ffmpeg When the installation process finishes, you are ready to begin.

Home About Terms Privacy Contact.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have videos with different resolution. I want that all of them will be in resolution of x I tried the command:. This is a little trickier. As you have your command, the aspect ratio is potentially going to get messed up. Options here Option 2 would be the preferred solution, otherwise you are probably unnecessarily increasing the output file size.

Option 3, I'll give a partially tested solution. Option 4 I'm not even going to touch. Option 3: Scale the video, keep aspect ratio and pad with black bars so that the video size is exactly x Learn more. Change video resolution ffmpeg Ask Question. Asked 4 years, 9 months ago. Active 24 days ago. Viewed 38k times. What I'm doing wrong? Impossible to provide an answer without the complete console output from your command.

Active Oldest Votes. I guess that really there are two questions here How do I batch convert files? How do I auto scale a video? These scripts ought to do the trickBy using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Super User is a question and answer site for computer enthusiasts and power users. It only takes a minute to sign up.

I have an original video dimensions of x, now I want to resize the video to x to meet the requirement. Using the scale filter will provide more flexibility:. The -1 will tell ffmpeg to automatically choose the correct height in relation to the provided width to preserve the aspect ratio. One downside of scale when using libx is that this encoder requires even values and scale may automatically choose an odd value resulting in an error: width or height not divisible by 2.

You can tell scale to choose an even value for a given height in this example :. Note that your ffmpeg build could complain about not recognizing -c or -filter options. It also may not support scale. In that case you should use a newer ffmpeg, which you can download as a static build, or compile yourself. If you want to scale based on input size Eg. Sign up to join this community. The best answers are voted up and rise to the top.

How to resize a video to make it smaller with FFmpeg Ask Question. Asked 7 years, 10 months ago. Active 2 years, 7 months ago. Viewed k times. Is it possible to resize my videos to make them smaller with FFmpeg?

ffmpeg reduce video resolution

How can I do this? Alan Alan 1, 2 2 gold badges 8 8 silver badges 6 6 bronze badges. Active Oldest Votes. The most basic example is this: ffmpeg -i input. I tried ffmpeg -i output. After digging through the man page for ffmpeg several times I found that instead of -filter:vthe option appears to have been changed to -vf.

The Ubuntu version you were using is broken and outdated—it's not really FFmpeg's ffmpegbut the binary supplied by Libav the FFmpeg fork under the same name.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Video Production Stack Exchange is a question and answer site for engineers, producers, editors, and enthusiasts spanning the fields of video, and media creation.

It only takes a minute to sign up. The resolution and FPS are well beyond what I require, so I'm trying to run a command to scale things down:. This is successful in giving me the desired resolution, framerate and lower file size, but it also degraded the quality way more than I expected. It's unclear to me why it wouldn't use the same output formats as input formats. I tried to use this command to force it to use H. I'm not sure why I can't do this.

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Running "ffmpeg -formats" listed h as one it could use for both input and output. I've found a solution looking at the use of presets. After looking for information about presets, I found the following tutorial discussing them:.

I'm trying to help. There's got to be a switch for multipass encoding. I know there are some built-in presets you could probably use and do almost certainly what you're aiming for. These are normally called x presets or x tune.

ffmpeg reduce video resolution

Can you find anything like that? A good test for this is to run through the encode with -crf 20 take note of the bitrate, and then use that as the -b setting for a 2nd version of the file both should be the same file size, compare the two for quality differences. And last thing I would highly recommend using a modern container format. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Ask Question. Asked 8 years, 5 months ago.

Active 6 years, 8 months ago.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It only takes a minute to sign up. How can I use ffmpeg to reduce the size of a video by lowering the quality as minimally as possible, naturally, because I need it to run on a mobile device that doesn't have much available space?

This answer was written in Since a video format much better than H. To use it, replace the libx codec with libx, and push the compression lever further by increasing the CRF value — add, say, 4 or 6, since a reasonable range for H. Note that lower CRF values correspond to higher bitrates, and hence produce higher quality videos. To see this technique applied using the older H. Calculate the bitrate you need by dividing your target size in bits by the video length in seconds.

ffmpeg reduce video resolution

Additional options that might be worth considering is setting the Constant Rate Factorwhich lowers the average bit rate, but retains better quality. Vary the CRF between around 18 and 24 — the lower, the higher the bitrate.

You mentioned wanting to reduce filesize to fit more videos on a mobile device, which is my usecase as well. All the answers here are for reducing the compression quality but nobody has mentioned reducing video frame size.

It's a lot quicker, from about 3 to 5 times quicker than recompressing in my experience. See the ffmpeg docs on scaling for more info. I tested most of the other proposed answers to this question.

The test data conclusions are below. These are the proposed answers that I tested:. The SZ method is definitely the quickest method. It was 2X to 4X faster. 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! For example, The CR method took 53 minutes to convert the 21 minute video.

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. For example, if your phone can only display a p picture, sending it a x video is just wasteful. It would be best to half its size to p. For example, the BR method more than doubled the size of the p sample. It did however make the p size one-third.


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