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===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}}
===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.