[x264-devel] Fw: Re: Slices in x264

[rambler]

-------Original Message-------
 
From: x264-devel at videolan.org
Date: 01/17/07 06:17:25
To: x264-devel at videolan.org
Subject: [x264-devel] Re: Slices in x264
 
On Tuesday 16 January 2007 22:57, Jeff Clagg wrote:
> I don't have much to add beyond that Mans is right.
>
> From the most optimistic reckoning, using FEC at the transport stream
> layer adds 8.5% overhead to EVERY PID IN THE STREAM; compare that to
> using a few slices per frame, thus adding maybe 2% overhead in the
> video stream only - which may be enough to add a satisfactory amount of
> error resilience.
 
This is true, but the extra error resilience is only satisfactory because in
digital TV streams there is an I picture every half a second which will fix
up any accumulating errors. And I'd be certain that this regular I picture
adds a lot more than 8.5% to the video bitrate. In other applications it
would be cheaper and more effective to add FEC to the stream.
 
However, the original questioner was working in a packet based environment
and slices are useful there so that one lost packet does not mean one lost
picture. But error *concealment* would still need to be performed very soon
after despite this extra error *resilience*.
 
Cheers,
-Ryan
 
--
This is the x264-devel mailing-list
To unsubscribe, go to: http://developers.videolan.org/lists.html
 
 
 
--
No virus found in this incoming message.
Checked by AVG.
Version: 7.5.433 / Virus Database: 268.16.13/632 - Release Date: 01/16/2007
4:36 PM
 
.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.videolan.org/pipermail/x264-devel/attachments/20070117/fc45f563/attachment.htm