[opendtv] Re: Story of the Superbowl Commercials Party
- From: John McClenny <jamcclenny@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 10 Feb 2005 07:06:09 -0600
Prashant,
Selecting MPEG-2 versus MPEG-4/AVC requires some tradeoff analysis.
At lot depends on how much bandwidth you have available on your
network, particularly at the edge. The newer codecs wil give you the
close to the same video quality at much lower bit rates than MPEG-2.
The tradeoff for normal TV channel changing it that the time between
I-frames can be much longer, so the time to display the first full
frame can be up to 2 minutes in the extreme case. (Tom, what's the
max time between I-frames in AVC? )
For recorded content, such as movies, this isn't an issue since the
recording can just start with a full frame picture. However, for live
TV it is an issue, since you could join a show and have to wait a long
period of time before getting a ful frame to display. Several vendors
have rather complex tricks to handle this case, but it isn't pretty.
Also, the AVC realtime encoder/decoder products are still in their
infancy, so you would have a bit of an evaluation cycle to perfom to
select the appropriate systems.
Doc McClenny
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
