[opendtv] Re: re-encoding
- From: "Gary Hughes" <ghughes@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 18 May 2005 10:40:19 -0400
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx=20
> [mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of John Willkie
> Sent: Tuesday, May 17, 2005 8:43 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: re-encoding
>=20
>=20
> Martin;
>=20
> What's unique about it? Does it transcode metadata? Adjust=20
> timestamps? Or, does it reconstruct the transport stream when=20
> no transport stream is available?
>=20
In essence it allows all of the information embodied in the MPEG
headers to travel along with the uncompressed frame. If you think
of this information as a record of the decisions made by the encoder
then it should be possible for a suitable encoder to read this data
and re-encode an unmodified frame, making the same decisions and
recreating the same compressed frame (subject to DCT math errors etc).
Or to take a modified frame with the knowledge of what was modified
and how it was previously encoded to optimise the re-encode.
It is a neat idea. I'm surprised it didn't find more applications.
gary
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