To double a videos resolution: ffmpeg -i input.mp4 -vf scale=iw*2:ih*2 output.mp4 To scale the video file by “times its self” such as twice as large or twice as small you can use variables * or / along with iw and ih to specify the input width and input height respectively. This will upscale input.mp4 to be 4k resolution. If you know the desired resolution, simply setting the specific width and height for scaling with the scale flag: ffmpeg -i input.mp4 -vf scale=3840:2560 output4k.mp4 There is no flag or parameter to do either upscaling or downscaling rather this is determined by the values set for the scale flag.
Or an advanced scale with flags and encoding: ffmpeg -i input.mp4 -vf scale=2560x1440:flags=lanczos -c:v libx264 -preset slow -crf 20 output_compress_1440p.mp4 The basis of scaling a video with FFmpeg uses the scale flag after the filtergraph ( -vf), then you can either do basic video scaling such as upscaling the video to twice the original resolution: ffmpeg -i input.mp4 -vf scale=iw*2:ih*2 output.mp4 Scaling a video means to make it either larger (higher resolution) or smaller (smaller resolution). Your browser does not support the video tag.How to do video scaling using FFmpeg with examples for different types of upscaling and downscaling methods. $ ffmpeg -f v4l2 -i /dev/video0 Remote access from aweb browser
# Redirect index.html to the appropriate site # Only allow local people to get the status # set this high enough to exceed stream bitrate
MaxBandwidth 10000 # Maximum bandwidth per client HTTPPort 8080 # Port to bind the server to # sh -c 'echo "deb jessie main" > /etc/apt/sources.list' Watermark ffmpeg -i -i watermark.png -filter_complex "overlay=10:10" -an -vcodec h264 file1.mp4ĭata e ora ffmpeg -i -vf "drawtext=fontfile=/usr/share/fonts/TTF/Vera.ttf: text='%.mp4" done Registrazione da stream mjpg ffmpeg -i -an -vcodec h264 file.mp4 $ ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4Ĭonversione da audio stereo a audio mono ffmpeg -i audio_stereo.m4a -ac 1 audio_stereo.mp3 Ffmpeg notes Concatenazione di file mp4 $ cat mylist.txt
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