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ffmpeg - usage, edit and tips.

OPTIONS
     -f FORMAT	  : See available formats with ffmpeg -formats
     -i INPUT

   Basic command
	   $ ffmpeg -f FORMAT1 [FORMAT1_OPTIONS] -i INPUT1 [-f FORMAT2
	   [FORMAT2_OPTIONS] -i INPUT2 -f ...] OUTPUT_FILE

   options lists
     codecs	   : ffmpeg -codecs
     formats	   : ffmpeg -formats
     pixel formats : ffmpeg -pix_fmts

EXAMPLES
     extract video	      : ffmpeg -i INPUT_FILE -c copy -an OUTPUT_FILE
     extract audio	      : ffmpeg -i INPUT_FILE -c copy -vn OUTPUT_FILE
     extract part of the file : ffmpeg -i INPUT_FILE -ss START_TIME -to
			      END_TIME OUTPUT_FILE
     record desktop	      : ffmpeg -f x11grab -s WIDTHxHEIGHT -i DISPLAY
			      OUTPUT_FILE
     record microphone audio  : ffmpeg -f [alsa|pulse] -i default OUTPUT_FILE
     START_TIME and END_TIME use the format HH:MM:SS[.MS].

x11grab
     offset	  : -i DISPLAY+X_OFFSET,Y_OFFSET
     framerate	  : -framerate FRAMERATE
     video codec  : -c:v CODEC
     pixel format : -pix_fmt FORMAT

   examples
     -f x11grab -s 1920x1080 -i :0.0
     -f x11grab -s 1920x1080 -i :0.0+1920,0
     -f x11grab -s 1920x1080 -framerate 30 -pix_fmt yuv420p -i :0.0+1920,0

DESKTOP AUDIO
   pulse
     1.	  Find the output monitor source: pactl list sources
	  Source #0
		  State: SUSPENDED
		  Name: alsa_output.pci-0000_09_00.6.analog-stereo.monitor
     2.	  Record from the monitor source: ffmpeg -f pulse -i 0 OUTPUT_FILE

INPUTS
   filter_complex
	   -filter_complex '[INPUT_ID:INPUT_CHANNEL]FILTER[MAP]'

   Audio Mix
     Mixing desktop and microphone audio:
	   -f pulse -i 0 -f alsa -i default -filter_complex
	   '[0:a][1:a]amerge=inputs=2'
     -	 [0:a] refers to input 0 (desktop in this case) and 'a' is the audio
	 channel.
     -	 inputs=2 input count.
     Managing volume: This adjusts the volume based on input, eg.: 0.1 from
     the input volume, not the output.
	   -f pulse -i 0 -f alsa -i default -filter_complex
	   '[0:a]volume=0.1[desk_audio];[1:a]volume=5[mic_audio];[mic_audio][desk_audio]amerge=inputs=2'
	   -c:a pcm_s24le
     -	 [0:a]volume=0.1[desk_audio] , [desk_audio] is a map to use later with
	 the filter amerge.
     -	 set volume for each input (desk and mic) and merge them using the
	 mapping: [mic_audio][desk_audio]amerge=inputs=2

SEE ALSO
     - Archlinux manpages: ffmpeg(1)

   links:
     - FFMPEG Documentation: https://ffmpeg.org/documentation.html
     - FFMPEG Trac wiki: https://trac.ffmpeg.org/wiki
     - FFMPEG Trac wiki - Capture PulseAudio:
     https://trac.ffmpeg.org/wiki/Capture/PulseAudio
     - FFMPEG Documentation - x11grab:
     https://ffmpeg.org/ffmpeg-devices.html#x11grab
     - FFMPEG Documentation - metadata:
     https://ffmpeg.org/ffmpeg-formats.html#Metadata-1
     - FFMPEG Trac wiki - ALSA: https://trac.ffmpeg.org/wiki/Capture/ALSA
     - FFMPEG Trac wiki - Desktop:
     https://trac.ffmpeg.org/wiki/Capture/Desktop
     - FFMPEG Trac wiki - AudioVolume:
     https://trac.ffmpeg.org/wiki/AudioVolume
     - FFMPEG Trac wiki - Audio Channel Manipulation:
     https://trac.ffmpeg.org/wiki/AudioChannelManipulation

AUTHORS
     ohazot(oh) | about(oh) | ohazot.com: https://ohazot.com
     <admin@ohazot.com>

linux , OpenBSD 7.8 |
		    Created:2026-03-23|Updated:2026-03-28|	    FFMPEG(oh)