Andreas, Rüdiger,
I have quite good experiances with the AXIS Q1755 network cam. We use it as a
backup recording system in many lecture halls and
absolutely no sync problems between audio and video even in 4 hour recordngs.
This is the recording command line:
/usr/bin/cvlc
"rtsp://$user:$p...@$cam/axis-media/media.amp?streamprofile=PM-Backup" \
":sout=#duplicate{dst=std{access=file,mux=mp4,dst=$filename.mp4}}"
Andreas:
with the new trunk version of Matterhorn, the capture client can use general
gstreamer piplines as a replacement for "real" media-devices.
I haven't tested it yet with Matterhorn but the following gstreamer pipline is
working in our Playmobil capture clients as a replacement
for a real video camera (video only, no audio):
gst-launch -ev \
rtspsrc
location=rtsp://$user:$p...@$cam/axis-media/media.amp?streamprofile=PM-Backup
latency=100 \
! rtph264depay ! ffdec_h264 ! videorate ! video/x-raw-yuv,framerate=25/1 !
queue \
! videocrop left=256 top=144 right=256 ! video/x-raw-yuv,width=768,hight=576 !
queue
With this pipeline I get an HD 720p (1280x720) stream from the network camera.
I crop the video at the left, right and top to get an SD PAL (768x576) raw
stream
without scaling for further processing.
For the audio you may establish a second rtsp connection to the cam and use an
audio-only streamprofile for this.
The synch between audio and video is probably no perfect but most likely good
enough (you may play with the latency option).
Regards
Armin
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Ruediger
Rolf
Gesendet: Donnerstag, 16. Dezember 2010 21:32
An: Matterhorn Users
Betreff: Re: [Matterhorn-users] Input or record from a network-based webcam
Hi Andreas,
recording IP-cameras was discussed previously already.
A solution to this would be to use some gstreamer modules that handle
rtp-connections. I don't know how easy this will be with the recent changes in
the capture agents architecture for 1.1. With 1.0 it is not possible.
In general I see many problems when it come to record live streams from
IP-cameras (especially muxed streams), as you can encounter unexpected delays,
if you don't have ideal conditions. We have an Axis Q1755 and I made some test
to record it from a distant server (camera in a classroom on the campus and the
server in the server farm).
In a two hour recording with VLC I always encountered massive delays between
audio and video (up to 5 minutes) I can notive the network lags in the
recordings.
The Q1755 has an build in SD-Card and the ability to push the recording to an
FTP-Server. Unfortunately in both cases the camera does not store the audio.
What camera do you intend to use?
Regards
Rüdiger
Am 16.12.10 19:11, schrieb Andreas Jung:
Aloha to all users,
i am new to Matterhorn and i made the last days my first steps. (babysteps)
I installed the software on a ubuntu 10.04 and it works fine. About the
A/V-Input i
thought i use a network-based webcam which can stream multiple videos (speaker
and blackboard for example).
My question was now - how can i get the livestream into the system. I thought -
with a lot of support from our software-guru's - create a "special point" in the
operating system like /dev/specialpoint and pipe the livestream with vlc to this
point. Than - use the capture agent from Matterhorn and record from this
"special point".
Has anyone thought about this setting?
--
Mit freundlichem Gruss
Andreas Jung - http://www.in.tum.de/~jung<http://www.in.tum.de/%7Ejung> -
http://tumtv.in.tum.de
Technische Universität München Telefon: +49 (0)89 289 18526
Fakultät für Informatik Fax: +49 (0)89 289 18507
Boltzmannstr. 3 Raum: 00.05.057
85748 Garching b. München Post intern: RBG-IN
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