In this example, the size is divided by twice the value required and then multiplied by two to ensure the pixel size is a multiple of two, which is required for some codecs.Ĭhange the Sample Aspect Ratio (SAR) of a video from 720p to 540 (4:3):įfmpeg -i "input.mp4" -vf scale=720:540 -c:v "output.mp4"Ĭhange the Display Aspect Ratio (DAR) of a video from 720p to 540 (4:3) this sets a metadata flag at the container level:įfmpeg -i "input.mp4" -aspect 720:540 -c copy "output.mp4" Batch conversionsīatch convert a folder of. To copy the video from invideo0.mp4 and the audio from inaudio1.mp4 and mux together matching the duration of the -shortest input stream:įfmpeg -i invideo0.mp4 -i inaudio1.mp4 -c copy -map 0:0 -map 1:1 -shortest output.mp4 Audio/video syncįfmpeg -i input.mp4 -itsoffset 0.2 -i input.mp4 -map 1:v -map 0:a -vcodec copy -acodec copy out.mp4įfmpeg -i input.mp4 -itsoffset 0.2 -i input.mp4 -map 0:v -map 1:a -vcodec copy -acodec copy out.mp4 Rotate a videoĠ = 90CounterClockwise + Vertical Flip (default)įfmpeg -i input.mp4 -vf "transpose= 1" output.mp4įfmpeg -i input.mp4 -vf "transpose= 2,transpose= 2" output.mp4 Change Aspect ratioĬhanging the resolution will always requires re-encoding.Ĭhange the Sample Aspect Ratio to be half that of the input file, this will create a significantly smaller (but lower quality) file:įfmpeg -i "input.mp4" -vf "scale=trunc(iw/4)*2:trunc(ih/4)*2" ~/output.mp4 Trimming can be done with or without -c copy, if you leave out -c copy, ffmpeg will re-encode the output file.Ĭopy only the first 60 seconds of a video:įfmpeg -i input.mp4 -t 60 -c copy output.mp4Ĭopy 2.5 minutes from the middle of a video without re-encoding it:įfmpeg -ss "00:00:59.59" -i "input.mp4" -c copy -map 0 -to "00:03:30.00" "output.mp4" Mux video and audio Times and duration can be given as hh:mm:ss.msec or a simple number of seconds. To Trim a file, add the options -ss -t or -to This can give a jagged appearance on a computer monitor.ĭeinterlace a file using "yet another deinterlacing filter".įfmpeg -i input.mp4 -vf yadif output.mp4 Extracting partial content Interlaced video is generated for TV/broadcasting with even lines are captured for one half frame followed by the odd lines in the next half frame.
Ffmpeg copy codec mp4#
mp4 specifying a high bitrate (-b) audio for best quality sound.įfmpeg -i ~/input.webm -c:v libx264 -c:a aac -strict experimental -b:a 192k output.mp4 Deinterlace mp3 specifying a high bitrate (-b) audio for best quality sound.įfmpeg -i ~/input.webm -b:a 192k ~/output.mp3Ĭonvert a. High-quality encoding using -crf (Constant Rate Factor) and -preset:įfmpeg -i input.mp4 -preset slower -crf 18 output.mp4Ĭonvert a. Specify the codecs for both video (-c:v) and audio (-c:a)įfmpeg -i input.mp4 -c:v vp9 -c:a mp3 output.mkvĮncode the audio as mp3 and copy the video stream unchanged: ffmpeg -i input.mp4 -c:v copy -c:a mp3 output.mkv mkv (another container format):įfmpeg -i input.webm -c:av copy output.mkv ':av' is the default so this could also be specified with just -c copy:įfmpeg -i input.mkv -c:av copy output.mp4
Remux from MKV (a container format) into MP4 (another container format), lossless copy without re-encoding. A cross-platform solution to record, convert and stream audio and video.
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