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A
Anonymous
February 9, 2012
Question

why high bandwidth is used by the FMS 4.5 when serving a VOD file

  • February 9, 2012
  • 1 reply
  • 501 views

Hi there,

We are currently trying the FMS 4.5.

We noticed that when we are streaming our own VOD file that we had copied to the server, which is an .MP4 file encoded at  1200 kbps

using either HDS or RTMP (, which I suppose the server recodes on the fly ) we are getting the incoming stream at the average bitrate of 14 Mbit/s, and it looks like bursts of 25 Mbit every couple of seconds.

However if we try a sample file, such us sampl1_1500kbps.f4v we are getting an average of 1.2 Mbit/s with peaks of 1.5-2 Mbit.

The tests are conducted in our company LAN.

So what is the reason for this? And is there a way to control/restrict the output bandwidth for our own file without re-encoding?

(Please note that I'm not talking about several streams with different bitrate for the same source aka adaptive bitrate but rather about the single stream bw)

Thank you in adavnce,

Igor.

This topic has been closed for replies.

1 reply

N
Adobe Employee
NpComplete
Adobe Employee
February 9, 2012

Do your VOD files also have the data messages ( or any other tracks), that you might not be counting in the original bit rate of your file? In case of HDS, you may check the access logs to find how much data was transferred for the HDS stream requests and then divide by the stream overall time to find how much data was packaged per second of the stream. Generally all HDS fragments are of same time-size if keyframes are at regular time interval.. Can you see the culprit fragments that might be very odd in sizes from the rest.

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