| Author |
Message |
McM
Guest
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 Posted:
Thu Sep 02, 2004 5:45 am Post subject:
Questions about Multi-BitRate (MBR) Files |
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Hello,
I have some questions about MBR (multi-bitrate) files.
1. If I create an MBR file with the WinMedia Encoder
tool, does it actually place in the output WMV file a
separate and unique track for each bitrate that I specify?
2. Does the WinMedia Format SDK have an interface that
will let me open/read/decode a particular track of an MBR
encoded WMV file?
3. Is an MBR file only meaningful/useful when served from
an MMS server or can I serve it from a web server?
Thanks,
~Michael.
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Neil Smith [MVP Digital M
Guest
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| Posted:
Thu Sep 02, 2004 4:16 pm Post subject:
Re: Questions about Multi-BitRate (MBR) Files |
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I can answer 3 : You can't use MBR from a web server, because web
servers have no way to negotiate a partial data stream from the
compressed dataset. So yes, it's MMS or nothing.
Cheers - Neil
On Wed, 1 Sep 2004 18:45:08 -0700, "McM"
<anonymous@discussions.microsoft.com> wrote:
| Quote: | Hello,
I have some questions about MBR (multi-bitrate) files.
1. If I create an MBR file with the WinMedia Encoder
tool, does it actually place in the output WMV file a
separate and unique track for each bitrate that I specify?
2. Does the WinMedia Format SDK have an interface that
will let me open/read/decode a particular track of an MBR
encoded WMV file?
3. Is an MBR file only meaningful/useful when served from
an MMS server or can I serve it from a web server?
Thanks,
~Michael. |
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| Back to top |
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Becky Weiss [MS]
Guest
|
| Posted:
Fri Sep 03, 2004 8:07 pm Post subject:
Re: Questions about Multi-BitRate (MBR) Files |
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|
1. Yes, when you create an MBR file, the resulting file has a separate stream
for each bitrate.
2. The Windows Media Format SDK Reader does let you manually select which of
these MBR streams it will read/decode for you (you can even select several of
them and read them at once, if that's useful). There are APIs on
IWMReaderAdvanced (e.g. SetManualStreamSelection, SetStreamsSelected) for
this, and you can read more about it in the docs.
Becky
This posting is provided AS IS with no warranties and confers no rights.
"Neil Smith [MVP Digital Media]" wrote:
| Quote: | I can answer 3 : You can't use MBR from a web server, because web
servers have no way to negotiate a partial data stream from the
compressed dataset. So yes, it's MMS or nothing.
Cheers - Neil
On Wed, 1 Sep 2004 18:45:08 -0700, "McM"
anonymous@discussions.microsoft.com> wrote:
Hello,
I have some questions about MBR (multi-bitrate) files.
1. If I create an MBR file with the WinMedia Encoder
tool, does it actually place in the output WMV file a
separate and unique track for each bitrate that I specify?
2. Does the WinMedia Format SDK have an interface that
will let me open/read/decode a particular track of an MBR
encoded WMV file?
3. Is an MBR file only meaningful/useful when served from
an MMS server or can I serve it from a web server?
Thanks,
~Michael.
|
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| Back to top |
|
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Neil Smith [MVP Digital M
Guest
|
| Posted:
Fri Sep 03, 2004 8:41 pm Post subject:
Re: Questions about Multi-BitRate (MBR) Files |
|
|
Yay, I think together we covered all of em ;-)
On Fri, 3 Sep 2004 09:07:02 -0700, "Becky Weiss [MS]" <Becky Weiss
[MS]@discussions.microsoft.com> wrote:
| Quote: | 1. Yes, when you create an MBR file, the resulting file has a separate stream
for each bitrate.
2. The Windows Media Format SDK Reader does let you manually select which of
these MBR streams it will read/decode for you (you can even select several of
them and read them at once, if that's useful). There are APIs on
IWMReaderAdvanced (e.g. SetManualStreamSelection, SetStreamsSelected) for
this, and you can read more about it in the docs.
Becky
This posting is provided AS IS with no warranties and confers no rights.
"Neil Smith [MVP Digital Media]" wrote:
I can answer 3 : You can't use MBR from a web server, because web
servers have no way to negotiate a partial data stream from the
compressed dataset. So yes, it's MMS or nothing.
Cheers - Neil
On Wed, 1 Sep 2004 18:45:08 -0700, "McM"
anonymous@discussions.microsoft.com> wrote:
Hello,
I have some questions about MBR (multi-bitrate) files.
1. If I create an MBR file with the WinMedia Encoder
tool, does it actually place in the output WMV file a
separate and unique track for each bitrate that I specify?
2. Does the WinMedia Format SDK have an interface that
will let me open/read/decode a particular track of an MBR
encoded WMV file?
3. Is an MBR file only meaningful/useful when served from
an MMS server or can I serve it from a web server?
Thanks,
~Michael.
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