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Ffmpeg X265
Low rate high latencyy 1280×720 ffmpeg x265 encoding
ffmpeg.exe -f dshow -video_size 1280x720 -framerate 5 -rtbufsize 702000k -pixel_format yuyv422 -i video="Trust HD Webcam" -c:v libx265 -preset medium -bufsize 1000k -crf 46 output.mp4
Low rate high latency 640×360 ffmpeg x265 encoding
ffmpeg.exe -f dshow -video_size 1280x720 -framerate 5 -rtbufsize 702000k -pixel_format yuyv422 -i video="Trust HD Webcam" -c:v libx265 -preset slow -bufsize 1000k -vf scale=-1:360 -crf 35 output.mp4
Low rate high latency 1280×720 ffmpeg vp9 encoding
ffmpeg.exe -f dshow -video_size 1280x720 -framerate 5 -rtbufsize 702000k -pixel_format yuyv422 -i video="Trust HD Webcam" -c:v libvpx-vp9 -b:v 30k output.webm
sources :
https://trac.ffmpeg.org/wiki/DirectShow
https://trac.ffmpeg.org/wiki/Encode/H.265
https://www.virag.si/2012/01/web-video-encoding-tutorial-with-ffmpeg-0-9/