The behavior of mjpg-streamer has changed sometime in the past 6 weeks.  Prior to that time, when you built it in or installed it as a package, a directory, /webcam_www was installed.  This contained various programs which could be invoked.  To run it, you had to issue a command like 'mjpg_streamer -i "input_uvc.so -d /dev/video0 -r 640x480" -o "output_http.so -p 8080 -w /webcam_www"&'.

Now the configuration is in /etc/config/mjpg-streamer, which would seem good in itself, but where are the options documented?  Just streaming seems not to work:  I tried http://192.168.1.60:8080 and got nothing.  Snapshot does work: http://192.168.1.60:8080/?action=snapshot

I had the old /webcam_www, so I did /etc/init.d/mjpg-streamer disable, copied in /webcam_www and started the old way: http://192.168.1.60:8080

This gave me streaming video.  It would be nice to have such a change documented, but the wiki doesn't have an entry for "mjpg-streamer".  Is there someplace which gives what the options are in the config file or what the uci commands are to control the uvc webcam?

https://dev.openwrt.org/changeset/17002 was the changeset and the options seem rather self-explanatory. Perhaps the /webcam_www removal should be reverted?

The options which are included in /etc/config/mjpg-streamer are self explanatory, but what about the one's which are omitted?  How does one "stream" with this "streamer" as set up?  There may be a way, but it isn't laid out.  It would help, in a case like this, if the config file included a "#default" section in which the defaults for other options were shown.