How do you scale in FFmpeg?

Part 1. How to Use FFmpeg to Resize Videos

  1. Download and Install FFmpeg to Your Computer.
  2. Determine your file format and name.
  3. Open your computer’s command prompt.
  4. Switch the command line.
  5. Input your new video width.
  6. ffmpeg -i input.mp4 -vf scale=480:-1 output.mp4.
  7. Input your new video height.

How do I scale an image in FFmpeg?

FFMpeg is using the libswscale library to resize the input. The libswscale library contains video image scaling and colorspace/pixelformat conversion routines. When we scale an image without specifying the size, the input dimension is used as the default value. We set the width of the output image to 250 pixels.

How do I change frame size in FFmpeg?

This can be done in two ways as discussed above, so let’s try both ways.

  1. Specify the Width To Retain the Aspect Ratio. ffmpeg -i input.mp4 -vf scale=320:-1 output.mp4. The resulting video will have a resolution of 320×180 .
  2. Specify the Height To Retain the Aspect Ratio. ffmpeg -i input.mp4 -vf scale=-1:720 output.mp4.

How do I compress a video in FFmpeg?

Download and set up FFmpeg on your computer, use command line to compress video with FFmpeg by changing video codec format, lowering down bitrate, cutting video length, etc. For example, set CRF in FFmpeg to reduce video file size (ffmpeg -i input. mp4 -vcodec libx264 -crf 24 output.

How do I scale down the resolution of a video?

Click the Settings button (it looks like a wrench and a screwdriver) to the right of the Profile dropdown, then select the Resolution tab. From there, you can adjust the scale to retain your current proportion, or manually adjust the size of the video.

How good is FFmpeg?

FFmpeg is a great tool for quickly changing an AV file’s format or quality, extracting audio, creating GIFs, and more. There are many open source tools out there for editing, tweaking, and converting multimedia into exactly what you need.

How do I set bitrate in FFmpeg?

To set the bitrate target in FFmpeg, use the -b:v code (bitrate:video) below : ffmpeg -i Test_1080p. MP4 -c:v libx264 -b:v 5000k Test_DR_5M.

What is SAR FFmpeg?

SAR (Sample Aspect Ratio) is the same as PAR (Pixel Aspect Ratio). These two terms are used interchangeably. They mean the ratio between the width and the height of individual pixels. In contrast, DAR (Display Aspect ratio) is the ratio between the width and the height of the full image.

What is CRF FFmpeg?

The Constant Rate Factor or CRF is an option available in the libx264 encoder to set our desired output quality. It enables us to specify a target value that maps to a specific quality by adjusting the bitrates automatically based on the input video.

How do I change the width and height of a video?

How to Resize Your Videos

  1. Open Movavi Video Converter and add your video file to the program.
  2. Select the desired output format for conversion.
  3. Click the Cogwheel button next to the Output format field.
  4. Specify the resolution of your video and choose the desired resize method.
  5. Start conversion.