Effectively the source video has to be unpacked into a base format then
repacked into a new codec. Rewrapping is fast because all that needs to
happen is header/container data around the video data is rewritten, but for
a re-encode you always have to go down to a common level before building
back up.
I'd assume the speed in this case is because the codecs are processor
friendly. They don't require a lot of overhead to decode and encode. So,
unlike H.264 for example, the frame from the DNxHD can be quickly extracted
and then quickly recompressed.
Dylan Reeve
http://dylanreeve.com/
On Thu, Aug 11, 2011 at 6:12 AM, Dennis Degan <DennyD1@verizon.net> wrote:
> **
>
>
>
> On Aug 10, 2011, at 10:24 AM, Christopher Pitbladdo wrote:
>
> > I was baffled and amazed when I started a transcode in Apple
> Compressor to take some 185X footage, and transcode to Prores HQ. A
> thirty second clip took ten seconds to process.
> > I take it the two codecs are very similar?
>
> I state:
>
> Yes.
>
>
> > Is it just a wrapper thing?
>
> No.
>
> Dennis Degan, Video Editor-Consultant-Knowledge Bank
> NBC Today Show, New York
>
>
>
[Non-text portions of this message have been removed]
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