.Dd Created:2026-03-23|Updated:2026-03-28|
.de ocsi
\\$*
,
..
.de oxr
.ocsi .Xr \\$*
..
.de oit
.It
\\$*
..
.de obdi
.Bl -dash -compact
.oit \\$*
..
.de obdl
.Bd -literal -compact
\\$*
..
.de onote
.Bl -hang -compact
.oit \\$*
.El
..
.de ocomm
.Bl -diag -compact
.oit \\$*
.El
..
.de opsy
.Pp
.Sy - \\$*
..
.de obc
.Bl -column \\$*
..
.de obc2
.obc opt desc
..
.de obc3
.obc option arguments description
..
.Dt FFMPEG oh
.Os linux , OpenBSD 7.8 |
.Nm ffmpeg 
.Nd usage, edit and tips.
.Sh OPTIONS
.obc _f_format
.It -f FORMAT Ta : See available formats with Li ffmpeg -formats
.It -i INPUT
.El
.Ss Basic command
.Dl $ ffmpeg -f FORMAT1 [FORMAT1_OPTIONS] -i INPUT1 [-f FORMAT2 [FORMAT2_OPTIONS] -i INPUT2 -f ... ] OUTPUT_FILE
.Ss options lists
.obc pixel_form
.It codecs Ta : Li ffmpeg -codecs
.It formats Ta : Li ffmpeg -formats
.It pixel formats Ta : Li ffmpeg -pix_fmts
.El
.Sh EXAMPLES
.obc extract_part_of_the_f command
.It extract video Ta : Li ffmpeg -i INPUT_FILE -c copy -an OUTPUT_FILE
.It extract audio Ta : Li ffmpeg -i INPUT_FILE -c copy -vn OUTPUT_FILE
.It extract part of the file Ta : Li ffmpeg -i INPUT_FILE -ss START_TIME -to END_TIME OUTPUT_FILE
.It record desktop Ta : Li ffmpeg -f x11grab -s WIDTHxHEIGHT -i DISPLAY OUTPUT_FILE
.It record microphone audio Ta : Li ffmpeg -f [alsa|pulse] -i default OUTPUT_FILE
.El
START_TIME and END_TIME use the format HH:MM:SS[.MS].
.Sh x11grab
.obc pixel_for command
.It offset Ta : Li -i DISPLAY+X_OFFSET,Y_OFFSET
.It framerate Ta : Li -framerate FRAMERATE
.It video codec Ta : Li -c:v CODEC
.It pixel format Ta : Li -pix_fmt FORMAT
.El
.Ss examples
.obc2
.It Li -f x11grab -s 1920x1080 -i :0.0
.It Li -f x11grab -s 1920x1080 -i :0.0+1920,0
.It Li -f x11grab -s 1920x1080 -framerate 30 -pix_fmt yuv420p -i :0.0+1920,0 
.El
.Sh DESKTOP AUDIO
.Ss pulse
.Bl -enum -compact
.It
Find the output monitor source:
.Li pactl list sources
. Eg.:
.obdl Source #0
        State: SUSPENDED
        Name: alsa_output.pci-0000_09_00.6.analog-stereo.monitor
.Ed
.It
Record from the monitor source:
.Li ffmpeg -f pulse -i 0 OUTPUT_FILE
.El
.Sh INPUTS
.Ss filter_complex
.Dl -filter_complex '[INPUT_ID:INPUT_CHANNEL]FILTER[MAP]'
.Ss Audio Mix
Mixing desktop and microphone audio:
.Dl -f pulse -i 0 -f alsa -i default -filter_complex '[0:a][1:a]amerge=inputs=2'
.obdi [0:a] refers to input 0 (desktop in this case) and 'a' is the audio channel.
.oit inputs=2 input count.
.El
Managing volume: This adjusts the volume based on input, eg.: 0.1 from the input volume, not the output.
.Dl -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
.obdi .Li [0:a]volume=0.1[desk_audio]
, [desk_audio] is a map to use later with the filter amerge.
.oit set volume for each input (desk and mic) and merge them using the mapping:
.Li [mic_audio][desk_audio]amerge=inputs=2
.El
.Sh SEE ALSO
.opsy Archlinux manpages:
.Xr ffmpeg 1
.Ss links:
.obc2
.It - Lk https://ffmpeg.org/documentation.html FFMPEG Documentation
.It - Lk https://trac.ffmpeg.org/wiki FFMPEG Trac wiki
.It - Lk https://trac.ffmpeg.org/wiki/Capture/PulseAudio FFMPEG Trac wiki - Capture PulseAudio
.It - Lk https://ffmpeg.org/ffmpeg-devices.html#x11grab FFMPEG Documentation - x11grab
.It - Lk https://ffmpeg.org/ffmpeg-formats.html#Metadata-1 FFMPEG Documentation - metadata
.It - Lk https://trac.ffmpeg.org/wiki/Capture/ALSA FFMPEG Trac wiki - ALSA
.It - Lk https://trac.ffmpeg.org/wiki/Capture/Desktop FFMPEG Trac wiki - Desktop
.It - Lk https://trac.ffmpeg.org/wiki/AudioVolume FFMPEG Trac wiki - AudioVolume
.It - Lk https://trac.ffmpeg.org/wiki/AudioChannelManipulation FFMPEG Trac wiki - Audio Channel Manipulation
.El
.Sh AUTHORS
.An -nosplit
.Xr ohazot oh |
.Xr about oh |
.Lk https://ohazot.com ohazot.com
.Aq Mt admin@ohazot.com