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Re: [AG-TECH] Release of AGVCR - recording AG sessions


Hi,

Yes, I should probably note that problem in the 'known issues' stuff. Problem is I wrote a lot of this code a few months ago and only just recently did the website, so in testing with all of you fine folks I'm saying 'oh yea!' and trying to catch up on the documentation ... oops :)
Now, you *should* be able to immediately play back to the same venue you recorded from, while the AGtk VIC and RAT are running. This is true when AGVCR is running from Linux. It allows this because AGVCR is altering the SSRCs in every packet sent out on playback, thus since it appears to VIC and RAT as if new sources have 'appeared', then all works as it should. Under Windows I found that if I enabled this 'packet munging' for audio streams then it resulted in no audio being played at all - regardless of venue, whereas under Linux it worked fine. I will reinvestigate this but under Windows builds it's disabled for audio streams since the behavior was deemed 'unreliable', and I wanted to be sure that in both builds the stream output worked for most cases where a recording is played back at a different time from the original.
In your test here, it would work in the same venue if participants reloaded the venue, since then VIC and RAT would choose new SSRCs for their packets and everyone would be happy. The garbled audio in this case is from more than one source having the same SSRC, which is against the spec, i.e. bad.

Derek

Wachtel, Robert L wrote:
I just completed a test session with the folks at ANL. Recording worked
well. Playback did not do so well until I switched venues from the one
in which I made the original recording. Playback then worked well. Just
as with recording playback does require you to have a multicast session
active and join into the multicast group with the configuration in
AGVCR.

Playback while still in the original venue caused broken audio from the
other remote sites and I could not hear any of the playback audio though
I could see the video playback as well as the continuing live video.

This is on a Windows XP Pro SP2 in multicast.

Bob W.
243-2857

-----Original Message-----
From: owner-ag-tech@mcs.anl.gov [mailto:owner-ag-tech@mcs.anl.gov] On
Behalf Of monika.k.rabarison@ccaix.jsums.edu
Sent: Thursday, November 10, 2005 9:42 AM
To: Nagykaldi,Zsolt F. (HSC); dcpiper@indiana.edu
Cc: Access Grid Technical mailing list
Subject: RE: [AG-TECH] Release of AGVCR - recording AG sessions

Also, when I start agvcr from the command line and play back
the recorded file, vic and rat start but showing the current
video and audio in the venue, instead of the recorded ones. 

Hi All,

I am currently trying it on XP Pro SP2 with multicast.
Recording seems to work fine (the file got some size).
When playing back, I don't see vic and rat starting.

I am not sure what I am doing wrong. Attached is a
snaphot. Note the "File Offset: .....out of 0 bytes" ????

TIA
Monika




Win XP Pro SP2. Works like a charm in multicast.

Zsolt


_ _ _

Zsolt Nagykaldi, PhD
Research Associate, Clinical IT Specialist
University Of Oklahoma Health Sciences Center
Department Of Family And Preventive Medicine
Oklahoma Center For Family Medicine Research

900 NE 10th Street
Oklahoma City, OK 73104
Phone: (405) 271-8000 Ext.:1-32212
Fax:     (405) 271-1682

________________________________

From: dcpiper@indiana.edu [mailto:dcpiper@indiana.edu]
Sent: Wed 11/9/2005 7:07 PM
To: Nagykaldi, Zsolt F. (HSC)
Cc: Access Grid Technical mailing list
Subject: RE: [AG-TECH] Release of AGVCR - recording AG
sessions




Hi Zsolt,

Yea, that's one thing noted in the 'known issues', the
problem with recording from unicast. I'm glad to hear
AGConnector helped, I like that program. There's some
old code in there that I wrote for trying to send data
to QuickBridge (since it seems to need to receive
something in order to send data back to you) but I never
did get it working to any satisfaction.

Since I'm replying to all I was aware (as is typical
after announcing something works) that under Windows now
it appears to have problems with reading or displaying
the file length, something for me to look at tomorrow.

Growing pains I think, I've been rewriting a lot of it
(under Linux for the most part) in the last few weeks as
I've considered more things that I wanted to add, and lo
today I 'got the nod' to release it. So I thought I'd
let everyone take a look instead of me sitting on it a
moment longer. This may be good and bad, but as long as
everyone treats it as 'alpha' for now until more testing
is done then I think we'll all be good. I do not think
the file format will need to change, given all that I
have in my 'future plans', so any recordings made now
will work in later versions. If for some reason it does,
I will make available the converter program I have used
to convert previous recordings to the new format.

Thanks for trying it out, incidentally, what version did
you use, Windows or Linux?

Derek

Quoting "Nagykaldi, Zsolt F. (HSC)"
<Zsolt-Nagykaldi@ouhsc.edu>:
Fantastic Derek, thanks! One thing. In bridged unicast
the recorder can not establish connection with the IPs
and ports listed. However, in multicast (even with the
AG Connector) it rocks! Zsolt


_ _ _

Zsolt Nagykaldi, PhD
Research Associate, Clinical IT Specialist
University Of Oklahoma Health Sciences Center
Department Of Family And Preventive Medicine
Oklahoma Center For Family Medicine Research

900 NE 10th Street
Oklahoma City, OK 73104
Phone: (405) 271-8000 Ext.:1-32212
Fax: (405) 271-1682

________________________________

From: owner-ag-tech@mcs.anl.gov on behalf of Derek
Piper Sent: Wed 11/9/2005 2:57 PM
To: Access Grid Technical mailing list
Subject: [AG-TECH] Release of AGVCR - recording AG
sessions >



       Hi all,

       I'm happy to announce that finally I've been
given the go-ahead to release AGVCR to the community.
It was a program I started writing around January and
it was ready for release in a workable incarnation

some time in June. However, due to possible 'intellecual


property' concerns from 'those that deal with those
things' at IU, I was unable to release it back then. I
declined to mention it to the community at large until

this release so as not to 'tease' people with a product


they could not get. I won't get into griping about
that on this list :> Some of you have known about this
program earlier since we have had AccessGrid meetings
that I have recorded. For those parties concerned, we

can communicate off-list on the best way to get the


       recordings to you. AGVCR is a program to
record and play back the RTP/RTCP stream that an
AccessGrid conference uses. The amount of data it
gathers is certainly non-trivial, a few hours of
recording with a number of participants can easily
reach a few gigabytes in size. Timing and minimal
       overhead information is embedded in the file

for accurate playback. The website for the project is
here: > 
http://iri.informatics.indiana.edu/~dcpiper/agvcr/ >


       I invite anyone interested to take a look,
download and use it to see
what you think. I welcome feedback, please bear in
mind though that it is still being actively worked on.
A number of changes have been made of late, so testing
has not been as extensive as it probably should  be,

but that's another reason to get it out there. The


website has source for Linux/Unix and a precompiled
binary for Windows. I may add pre-compiled binaries

for popular Linuxes if there is interest. >


       Thanks,

       Derek

--
Derek Piper - dcpiper@indiana.edu - (812) 856 0111
IRI 323, School of Informatics
Indiana University, Bloomington, Indiana

[Attachment: agvcr.jpg] 



--
Derek Piper - dcpiper@indiana.edu - (812) 856 0111
IRI 323, School of Informatics
Indiana University, Bloomington, Indiana