[Live-devel] openRTSP and video sequences

[Tom Hansen]

Thank you for the prompt reply!

The application is an underwater camera that is tied to a buoy via an
Ethernet line.  The buoy is in turn tied to shore via a 802.11b link.
An ARM single board computer aboard the buoy needs to record the video to
its flash drive, using openRTSP or similar software.

Bandwidth is a big concern because of the limited speed of the connection
and also because the 802.11 radio can only be on for limited periods to
conserve power.

The idea is to record full video files and also construct time-lapse
videos ( < 1 frame/sec) during the day and then always download the 
time-lapse videos.  A researcher on shore would then review the time-lapse
and then download the full video clips for any interesting portions
spotted in  the time-lapse.

Now, if there was a way to take hour-long video files from which
a researcher could choose a portion to download, then we'd probably
be in business.  I'm not sure that the ARM SBC would be able to
handle running a streaming server though.

As for my original idea, wouldn't it be possible to somehow modify
openRTSP to simply close the current video file and start a new one
if it received, say, a kill -USR2 or something?  Sort of like many daemons
that allow you to rotate their log files by sending them a signal?

Just a thought.



--- Original Message ---

>/However, what I need to do is record the stream in small chunks (say 1
/>/minute long) and then later be able to tack them together to make a
/>/continuous video.  I just use the -e 60 option to create 60-second long
/>/segments, and loop it in a shell script.
/>/
/>/The problem is, there is always around a 1/3 second time gap between
/>/the files, which causes a "jump" in the resulting concatenated video.
/>/
/>/Is there any way to seamlessly create segmented video like this with
/>/openRTSP?
/
I.e., instead of trying 
to find a way to first record 1-minute files, which you later join 
together into a single file, record a single file that you later 
split into 1-minute segments.  I realize that this may not be what 
you're looking for, but it seems to me like an easier approach...


	Ross Finlayson
	Live Networks, Inc. (LIVE555.COM)
	<http://www.live555.com/>



-- 
Tom Hansen
Senior Information Processing Consultant
Great Lakes WATER Institute
tomh at uwm.edu
www.glwi.uwm.edu