Picture freezes (slideshow-like), in file downloaded from wowza-based streamingserver

[etiam]

Hi,

I've been trying to download some nice video lectures, but this mihght just prove to be the most difficult case I have ever come across.
Here's an example:
https://www.ipam.ucla.edu/wowzavideo...p4&vfd=gss2012

rtmpsrv sniffs it out all right, but it was necessary to add --realtime (or possibly --live) to prevent the download from just repeating the first few minutes without end. With that addition the stream downloads, but the resulting file only has smooth visual performance for approximately the first minute. Then it starts showing a new frame only about once per second.

Here's a short video sample (the problem starts around 1:10):
https://mega.co.nz/#!FJli3TbJ!GsUe9g...2t0rTQkv 9q7s

At the time I was using the git repository version from 10 April 2013 (compiled statically) on Linux Mint 13.
Terminal I/O from the first 60 seconds of a run would look something like this:

 ~/rtmpdump $ ./rtmpdump -e --realtime -l 0 -r "rtmp://128.97.46.13:1935/gss2012/" -a "gss2012/" -f "LNX 11,0,1,152" -W "https://www.ipam.ucla.edu/videoplayer/jwplayer.flash.swf" -p "https://www.ipam.ucla.edu/wowzavideo.aspx?vfn=10660.mp4&vfd=gss2012" -y "mp4:10660.mp4" -o mp4_10660.flv
RTMPDump v2.4
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
Starting download at: 0.000 kB
  in approximately realtime (disabled BUFX speedup hack)
INFO: Metadata:
INFO: trackinfo:
INFO:   timescale             30000.00
INFO:   length                98732634.00
INFO:   language              eng
INFO: sampledescription:
INFO:   sampletype            avc1
INFO:   timescale             48000.00
INFO:   length                157974528.00
INFO:   language              eng
INFO: sampledescription:
INFO:   sampletype            mp4a
INFO:   audiochannels         2.00
INFO:   audiosamplerate       48000.00
INFO:   videoframerate        29.97
INFO:   aacaot                2.00
INFO:   avclevel              40.00
INFO:   avcprofile            100.00
INFO:   audiocodecid          mp4a
INFO:   videocodecid          avc1
INFO:   width                 1920.00
INFO:   height                1080.00
INFO:   frameWidth            1920.00
INFO:   frameHeight           1080.00
INFO:   displayWidth          1920.00
INFO:   displayHeight         1080.00
INFO:   framerate             29.97
INFO:   moovposition          32.00
INFO:   duration              3291.14
1649.603 kB / 10.81 sec (0.3%)

Is there something I can do to fix this problem?
Am I doing something wrong in my usage? And if not, where would be a good place to direct a bug report?