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Posted by Richard Crowley on 06/10/07 04:59
"Rock" wrote...
> I have done searches but still cannot find out much about
> adstream. Can find the company okay and know that it is
> used to deliver video commercials etc to TV stations rather
> than the hard copy tape method but,
>
> How is it done. Does one create an avi file which is then
> uploaded or streamed to the other party?
More and more broadcast content, both audio and video, both
program content and spots (commercials, "adverts") are being
distributed over the internet. Even high-definition, 60-sec TV
spots likely aren't all that big in terms of file size.
There is no significant difference between sending (or retrieving)
a video file from the ad agency to the TV station vs. your credit
card company sending the daily check clearances to your bank,
etc. They are just files full of ones and zeroes.
> If so what type of avi is required say for Aussie PAL?
AVI and WAV are specific kinds of RIFF files which are
container files capable of holding any of hundreds of ways
of encoding video/audio materials. AVI files have a code at
the beginning of the file (the "fourcc") that identifies how the
content was encoded (the "codec"), so that the contents can
be recovered properly. The kinds of codec's used for AVI
files typically don't care whether the content is PAL or NTSC
or SECAM or whatever. They simply document the pixel
dimensions of the frame, how many frames per second, etc.
Of course commercial TV program/spot distribution does
not necessarily even use AVI files. There are many different
kinds of file types used for video and audio.
http://en.wikipedia.org/wiki/RIFF_%28File_format%29
http://en.wikipedia.org/wiki/AVI
http://en.wikipedia.org/wiki/FourCC
http://en.wikipedia.org/wiki/Codec
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