[FFmpeg-user] CLI for low fps high resolution streaming?

[Rocky Ji]

Hi all!

tl;dr

What's the best codec & fps (and other CLI config) to minimize
bandwidth usage for streaming text editor videos? Specifically:
 * high res (as close to original as possible)
 * low fps (< 8 is fine)
 * low color count
 * no audio

_________

Details:

I want to stream video from a USB video capture device (using nginx).

The incoming video is of text editing for the most part, so I guess
difference between frames would be minimal 9/10 times. Color loss is
acceptable, but fonts should remain sharp.

I have found that `ffmpeg -f v4l2 -i /dev/video0 <extra config>
rtmp://localhost/live/test` is the basic template I need to follow.

Of all the combinations of codecs/framerates I tested, the only thing
that works without killing itself is `-f flv`.

If I try to suggest framerates, it works for 1-2 seconds and dies with
`[flv @ 0x...] failed to update header with correct
duration/filesize`.

Not specifiying a codec gives some NULL error. mp4, x264, mpeg4,
mpeg2video don't work. I was hopeful for VP8, but `-f VP8` doesn't
work.

mpegts works but dies as soon as vlc tries to open it (without
streaming anything).

Please advice.

Thanks.