[opendtv] Re: wm trials at different telcos using wm series
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 17 May 2005 19:40:33 -0400
Prashant Desai wrote:
infact somewhere
> I have read that VC1 which is just subset of wm9 deliver the
same quality
> video at approx half of the rate at which the mpeg-4 avc
delivers the same
> video with same quality
I think you were reading someones marketing literature.
You can download the X264 codec or Nero's codec and easily try for
yourself against WMV from Microsoft.
- Tom
> Hi Kon
>
> Thanks a lot for all the clarification ,
>
> It seems whoever is using wm9 ,most of them claiming that its pretty
> feature rich compared to the advanced codec MPEG-4 AVC , infact somewhere
> I have read that VC1 which is just subset of wm9 deliver the same quality
> video at approx half of the rate at which the mpeg-4 avc delivers the same
> video with same quality ..... and also that VC1's compression mechanism
> automatically gets improved with the increase of the bit rate [ encoding ]
> and thus it can compress data more effectively at higher bit rates ,
>
> I personally have never seen the quality of video for any of these MPEG-4
> AVC or wm9 or VC1 on a TV set at same rate ......
>
> Are there any test results that been published by an independent entity for
> these ? If there is please point me to it, since we really in dilemma
> whether to go with mpeg-4 AVC or with VC1 or with proprietary wm9?
>
> Pls guide me on this
>
> Regards,
> Prashant
>
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
> Behalf Of Kon Wilms
> Sent: Tuesday, May 17, 2005 11:25 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: wm trials at different telcos using wm series
>
> On Tue, 2005-05-17 at 23:01 +0530, Prashant Desai wrote:
>
>> I am curious , the list members views on the windows media server [ wm
>>series ] , is it a truly a carrier grade solution
>
>
> I wouldn't call putting windows 2003 and windows media server on an off
> the shelf server carrier grade. Try pulling the power plug and waiting
> for the reboot and checkdisk, then having all the clients reconnect to
> the box after a minute or two of downtime.
>
>
>> Does MS DRM can be used for securing/encrypting ( CAS functionality
>
> )the
>
>>live Broadcast TV channels ? which can be decoded on the PC or on the set
>>top box
>
>
> You can't do a full-blown CAS using the off-the-shelf MS DRM rights
> manager and windows media server. There is no SMS integration for one.
>
> DRM is file encryption and rights management. You're talking about pipe
> encryption and entitlement management. These are two different things.
>
>
>>Running windows CE OS , if MS DRM cant be used for encryption of the live
>>Broadcast TV channels then are there any other vendors who supports wm9
>>format
>
>
> Try any CA vendor? You're talking about pipe encryption. You don't need
> to know or care what the underlying protocol is (although with the
> fragmentation of large frames that windows media server/encoder does by
> default, I can see this being an issue).
>
>
>> I was just surprised when I came to know that windows media server is
>>capable of supporting few 10 thousands of unicast streams simultaneously
>>
>> At the rate of 512 KBPS to 1MBPS to 1.5 MBPS for viewing the same on
>>either PC or on TV sets.
>
>
> Why? You can do this one of two ways:
>
> 1. You just clone the socket for every unicast connection - you're
> really reading the pre-encoded source file only once. Everything else is
> an issue of the bus and network stack.
> 2. You load portions of the file/stream into buffered memory pools and
> serve them 10,000 times. 10,000 memcpy functions wont even break a
> sweat.
>
> Ofcourse both can go south really fast if a client has any network
> issues and starts lagging to the end of the buffer (at which point you
> need to drop him and restart the data flow). So you need to trade off
> network reliability against the size of the buffer in seconds.
>
> No rocket science there....
>
> Cheers
> Kon
>
>
>
>
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