![]() crf around 23 is recommended but feel free to experiment, the lower the number the higher the bitrate. crf lowers the average bitrate and retains quality. This is easily done with -crf or Constant Rate Factor. ffmpeg -i input.mp4 -vcodec h264 -b:v 1000k -acodec mp3 output. 3.6 Gb to 62 Mb, quality "good enough"/acceptable. ffmpeg -i input.mp4 -s 1280x720 -acodec copy -y output.mp4. ffmpeg -i input.mp4 -vcodec h264 -acodec mp2 out.mp4. FFmpeg automatically will apply the default compressions and it will considerably reduced the file video size.Commands using Linux with ffmpeg to shrinking big MP4 video file to smaller sizes. This command sets the constant rate factor and also lowers the overall bitrate.Now let's suppose you want to reduce or compress input file called input.mp4 input file: input.mp4 output file: output.mp4 Command is: ffmpeg -i input.mp4 output.mp4 So output.mp4 will be reduced and compressed in size. Here's what I use: ffmpeg -i input.mp4 -vcodec libx265 -crf 20 output.mp4. All you need to do is cd into the directory that contains the video, then run the command you need to compress. Here's the fun part: seeing the real magic of ffmpeg. Command-line - Compress and Convert MP4 to Webm for YouTube, Ins, Facebook.Compressing the file. ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4. Command-line - Compress and Convert H.264 to H.265 for Higher Compression. Here we take some typical command-line examples to show you how to compress MP4 /MOV/4K/MKV video size using FFmpeg.
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