Yes! this tool with millions of nobs
Some time when running a script that actually impact real life, it might be good to have a video recording.
ffmpeg -i /dev/video0 outfile.mkv
This will record the device of /dev/video0 to file
You might want to specify the input format to get every the camera have (frame rate, etc) stack overflow link
-input_format mjpeg
The default captured resolution is quite small, might want to specify it.
-video_size 1280x720
-f segment is needed for all following segment to work
segment_wrap limit:
Wrap around segment index once it reaches limit.
segment_format format:
Override the inner container format, by default it is guessed by the filename extension.
segment_time time:
Set segment duration to time, the value must be a duration specification. Default value is "2". See also the segment_times option.
Note that splitting may not be accurate, unless you force the reference stream key-frames at the given time. See the introductory notice and the examples below.
-strftime 1 is needed if output file needs time date formatting
a common date time format
%Y-%m-%d_%H:%M:%ST%z
coulde even use the date format to create sub-dir and group them
strftime_mkdir
Used together with -strftime_mkdir, it will create all subdirectories which is expanded in filename.
ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8
example command
ffmpeg -nostdin -nostats -video_size 1280x720 -i /dev/video0 -input_format mjpeg -f segment -segment_wrap 10 -segment_time $((60*5)) -strftime 1 ~/Downloads/ffmpeg/rec_%Y-%m-%d_%H:%M:%ST%z.mkv
--nostats will not show a rolling status bar when capturing, it will kept other info level logs. This will prevent your log file from this bash script being swamped with status update.
--nostdin will turn off ffmpeg's stdin reading. User could control the recording on the fly using keyboard, which is not wanted in scripts