It sounds like you are trying to minimize latency. There have been
discussions on this on the streaming server list around this topic.
Realize however that streaming is not video conferencing (where low
latency is a design point). With streaming, latency increases quality
of service by buffering, packet retransmission, etc. These are
important design points for streaming, and the reason that there is
more latency in streaming than video conferencing.
Here are some quotes from the mailing list archives that might be
helpful to you:
Let me start by mentioning that the following s being provided for
testing purposes and with the caveat that making the change below is a
completely unsupported configuration. However, you might giving it a
try.
Regarding reducing latency when viewing a reflected stream (.sdp)
through a QuickTime/Darwin Streaming Server, you might try changing
the "reflector_buffer_size_sec" property in the streamingserver.xml
file. For example, reduce the reflector's buffer delay from 10
seconds to 0 seconds (pref="reflector_buffer_size_sec").
Then, as root or the admin user edit the
/Library/QuickTimeStreaming/Config/streamingserver.xml file, and
search for this property:
Write the xml file back to disk (make sure that when you save it, save
it as plain text with .xml extension, don't save it accidentally as
..rtf, etc.)
Now, send a SIGHUP to the QTSS child process (the higher PID number)
or else stop/restart the QuickTimeStreamingServer using the Streaming
Web Admin interface.
To change things back, just re-edit the xml file and make the value be
10 again, and then restart the streaming server...
As for your original question, to turn disable overbuffering, you can
change the
following items in the
/Library/QuickTimeStreaming/Config/streamingserver.xml file
<!-- Rate at which to overbuffer: number of times the data rate -->
<PREF NAME="overbuffer_rate" TYPE="Float32">2.0</PREF>
Change this pref value to 1.0:
<PREF NAME="overbuffer_rate" TYPE="Float32">1.0</PREF>
This will cause the server to send at the rate it is encoded, and not
faster. There will be an initial overbuffering of data for the first
one second. To turn off all overbuffering, also modify the following
pref:
<!-- This is also the minimum time the server will wait
between sending packet data to a client -->
<PREF NAME="send_interval" TYPE="UInt32">50</PREF>
Change this pref value to 0:
<PREF NAME="send_interval" TYPE="UInt32">0</PREF>
Change this pref value to true:
<PREF NAME="disable_overbuffering" TYPE="Bool16" true</PREF>
This will turn off overbuffering completely.
On Jan 5, 2005, at 9:25 AM, Philippe De Neve wrote:
Hi folks,
I've got two questions:
1)
I've noticed that the DSS sends 2 frames simultaneously and waits then
for 2
frame periods (in my case about 66 ms for a 30 fps sequence). Can I
disable
this so every 33 ms a frame is send?
2)
With the Instant-on feature of quicktime it is possible to change the
buffering time I presume. But changing the Instant-On slider in the
Quicktime Preferences does not result in a change in the buffering
time. It
stays the same (3s). How can I set the buffering time (to zero)?
tnx for all help, Philippe.
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