How to record video for K1 Max with ffmpeg?

Step 1: Find K1 Max livestream url

• stream: http://K1_MAX_IP:8080/?action=stream
• snapshot: http://K1_MAX_IP:8080/?action=snapshot

For more details, go to http://K1_MAX_IP:8080

Step 2: Use ffmpeg command to take stream input (mjpg) and create video

I use encoder libvpx-vp9 to create

ffmpeg -i http://K1_MAX_IP:8080/?action=stream \
       -c:v libvpx-vp9 -vf fps=12 \
       -crf 30 -b:v 0 \
       -f segment \
       -segment_time 3600 \
       -reset_timestamps 1 \
       -strftime 1 \
       "%Y-%m-%dT%H%M%S.webm"

• -c:v: Use video encoder named libvpx-vp9
• fps=12: Use 12 frame per second for output video
• -crf 30: Constant Rate Factor. It refers to video quality. 0 means the best quality, 40+ means super compressed, worse quality. (tbh, I only test Constant Rate Factor 30)
• -b:v 0: Do not configure fixed video bitrate.
• -f segment -segment_time 3600: For each one hour, create a video file.
• -reset_timestamps 1: when create video, start timestamps at 1 (by default, it starts from the end timestamps of previous video)
• -strftime 1 "%Y-%m-%dT%H%M%S.webm": Output with filename format.

Credit

ChatGPT helps me so much with ffmpeg, without it, I can’t understand all the ffmpeg options quickyly.