Check for the output video file size and figure out the FFmpeg video compression ratio. When the video compression completes, the output video file should appear at your specified location. Tips: compressing 4K UHD videos in FFmpeg is CPU intensive, you'd better shut down other programs running background on your device. The video processing progress is showing at the bottom. Now, FFmpeg is running to do the video compression job. Hit enter and the video compression process should begin.
Use ffmpeg -i input.avi -vcodec libx264 -crf 24 output.avi, a 1GB video can be compressed to 200MB.
According to test, setting crf to 24 reduce a 250MB video to 70MB without losing the quality noticeably. f is used to explicitly specify the container format, -f mp4, -f wmv, -f webm, etc.ĬRF (Constant Rate Factor): set the CRF to lower the bit rate but retain better quality. These options are frequently used for reducing video size in FFmpeg. To make the command line clearer, below are what some common FFmpeg command-line options specify, including -c:v, -b:v, -c:a, -b:a, CRF. Here we take some typical command-line examples to show you how to compress MP4/MOV/4K/MKV video size using FFmpeg.Ĭommand-line - Compress and Convert H.264 to H.265 for Higher Compressionįfmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4Ĭommand-line - Compress and Convert MP4 to Webm for YouTube, Ins, Facebookįfmpeg -i source.mp4 -c:v libvpx-vp9 -b:v 0.33M -c:a libopus -b:a 96k \Ĭommand-line - Compress and Convert MP4 to WMVįfmpeg -i input.mp4 -b 1000k -vcodec wmv2 -acodec wmav2 -crf 19 -filter:v fps=fps=24 output.wmvĬommand-line -Set CRF in FFmpeg to Reduce Video File Sizeįfmpeg -i input.mp4 -vcodec libx264 -crf 24 output.mp4Ĭommand-line - Reduce video frame size to make 4K/1080P FHD video smallerįfmpeg -i input.avi -vf scale=1280:720 output.avi You can use a more efficient codec format (H.265 compresses data 30% smaller than H.264), lower bitrate or fps, shorter video length. There are a few ways to reduce video size using FFmpeg. For more detailed guide, check for this post " How to Install FFmpeg on Windows". Open Windows Powershell from the start menu, and start with the compression command-line in FFmpeg. For Windows users, Windows Powershell is recommended over Command-Line. Start with the command-line examples below using FFmpeg.ĭownload FFmpeg and finish the setup process on your computer. To compress videos in FFmpeg, you should make sure the command-line is right. Part 1: How to Compress Video Size with FFmpeg (Command-line) on Windows
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