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Posted by Neil Smith [MVP Digital Media] on 09/26/64 11:41
On 2 Mar 2006 03:29:58 -0800, "Travis Newbury"
<TravisNewbury@hotmail.com> wrote:
>> What does progressive download mean?
>
>Progressive download means that the browser downloads the file just
>like it would (say) a PDF file, or a large JPG. The player will start
>playing the video as soon as it has enough to start playing. If their
>internet connection is faster than it is playing, then the
>use sees the video playing just like it was streaming. If the
>connection is slower than the video playing, then the player will pause
>ever time it runs out of stuff to play.
>
>You can control a little of this by the size and speed you encode the
>video at.
>>Is there any automatic assignment of the right sized file
>> based on bandwidth?
>
>This depends on how you encode it. There is a thing called "Variable
>Bit Rate" which allows you to encode a video at various speeds in the
You meant to say "MBR" multiple bitrate for tha scenario.
VBR varies the overall bitrate as the name suggests, throughout the
encode process, but optionally never exceeding the maximum value you
set.
VBR allows you to optimse the video so quiescent passages and scenes
take lower bitrate than fast action scenes. It's a way to balance a
video encode so the overall bitrate comes close to averaging your
chosen download speed
>same file. We have not had a lot of luck with this. We like providing
>different links for different speeds. Let the user choose. If they
>try one and it does not work well, then they will chose a slower one.
** And as on the BBC news site, save the video choice in a cookie,
offering a user preferences area to reset that choice if the user
moves to DSL for example.
HTH
Cheers - Neil
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