Linux: https://linux.goeszen.com/capturing-vhs-video-with-vlc-via-v4l2.html

https://gordonlesti.com/digitize-a-vhs-tape-with-ffmpeg-and-easycap-on-linux/

Beginners: https://www.youtube.com/watch?v=sn_TDa9zY1c

• EasyCAP USB 2.0 Video Grabber
• RCA connector cable for composite video and stereo audio
• VHS video cassette recorder
• Computer with USB 2.0 and Linux

sudo apt install qv4l2 ffmpeg 

qv4l2

cat /proc/asound/cards

• USB video capture device is /dev/video0
• USB audio capture device is number 1 hw:1,0
• Captured and encoded in one go
• Small resultant file size

ffmpeg -f v4l2 -standard NTSC -thread_queue_size 512 -i /dev/video0 -f alsa -thread_queue_size 512 -i hw:1,0 -vcodec libx264 -preset superfast -crf 25 -s 720x576 -r 25 -aspect 4:3 -acodec libmp3lame -b:a 128k -channels 2 -ar 48000 yourvideo.mp4

ffmpeg -i input -vf "yadif=1:1,hqdn3d=3,drawbox=y=ih-h:w=0:h=6:t=max,format=yuv420p" -crf 23 -preset medium -c:a aac -movflags +faststart -metadata title="Title" output.mp4

• -ss 00:00:10 trim 10 seconds from beginning
• -to 02:47:10 will be end of trimmed video
• -c copy don't re-encode (very much faster)

ffmpeg -ss 00:00:10 -i yourvideo.mp4 -to 02:47:10 -c copy yourvideo_trimmed.mp4