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→Usage
===Basic Format Conversion===
===Basic Format Conversion===
{{cmdline|ffmpeg -i input.mp4 output.avi}}
{{cmdline|ffmpeg -i input.mp4 output.avi}}
<code>-i</code> specifies input file
The last argument is always the output file. Without specifying any codec or bit rate (see examples below), FFmpeg will encode the video using some arbitrary default settings.
===Remove audio from video file===
===Remove audio from video file===
===Add audio to video===
===Add audio to video===
{{cmdline|ffmpeg -i inputvideo.mp4 -i inputaudio.wav -vcodec copy -map 0:v -map 1:a output.mp4}}
{{cmdline|ffmpeg -i inputvideo.mp4 -i inputaudio.wav -vcodec copy -map 0:v -map 1:a output.mp4}}
<code>-i</code> is used twice here to add a seceond input file.
<code>-map 0:v</code> tells FFmpeg to take video from the first input (count starts at 0)
<code>-map 1:a</code> tells FFmpeg to take audio from the second input (1)
===Trimming video===
{{cmdline|ffmpeg -i input.mp4 -ss 00:00:04 -to 00:00:06 -vcodec h264 -b:v 8M output.mp4}}
<code>-ss 00:00:04</code> specifies the starting time, in this case 4 seconds (use format HH:MM:SS, or HH:MM:SS.MS)
<code>-to 00:00:06</code> specifies end point, in this case 6 seconds (same formatting as above)
Alternatively, instead of <code>-to</code>, you can use <code>-t 00:00:02</code> to cut exactly 2 seconds from the starting time.
<code>-vcodec h264</code> specifies video codec.
<code>-b:v 8M</code> specifies video bit rate, in this case 8Mbit/s, which determines video quality.
Note: you can use <code>-c copy</code> to trim without re-encoding, but FFmpeg can only cut to the nearest keyframe, so the output may not be exactly the same length as specified.
===Batching===
The following is a batch script (text file with .bat file extension) that converts all .mp4 files in the specified folder to .avi:
<pre>@echo off
setlocal enabledelayedexpansion
:: Set source video folder, as absolute path or relative to this script
set src="videos"
:: Set destination folder
set dst="videos/converted"
for /R %src% %%F in (*.mp4) do (
:: Put your FFmpeg command here
ffmpeg -i "%%F" -vcodec copy "%dst%\%%~nF.avi
)
pause
</pre>