[opendtv] Re: Video compression artifacts and MPEG noise reduction
- From: John Willkie <johnwillkie@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 18 Jun 2008 22:51:25 -0700 (GMT-07:00)
yeah, the box, fool, is practically useless for that, since, uh, NOBODY takes a
compressed MPEG-2 stream back to baseband, then uses this filter, then
recompresses it.
And a "prefilter" would imply that it goes before any compression, not in the
middle of a decompression/compression daisy chain. Kind of hard at the
beginning of a chain to know the noise that would be encountered in the middle
of the chain.
Indeed, taking a compressed MPEG-2 stream down to baseband would actually
impose noise JUST BY ITSELF since MPEG-2 compression is lossy and asymmetrical.
So, you'd be lucky if the "prefilter" was able to remove the noise caused by
the decompression to baseband.
The market for this device, Bert, is most likely YOU. Let us know how you fare
with it.
John Willkie
-----Original Message-----
>From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
>Sent: Jun 18, 2008 5:32 PM
>To: opendtv@xxxxxxxxxxxxx
>Subject: [opendtv] Re: Video compression artifacts and MPEG noise reduction
>
>Craig Birkmaier wrote:
>
>> You are either incorrigible or just plain ignorant!
>
>You're insisting? That's amazing!
>
>> Do you know what SMPTE 259M and 292M are?
>>
>> Clue - they are serial interfaces for the carriage of
>> baseband digital video signals Bert.
>>
>> Stop making an ASS out of yourself.
>
>Hey genius.
>
>I said initially what? I said that the box was a prefilter, to be used
>before MPEG encoding, to relieve stress when the bit streams get
>compressed and multiplexed.
>
>Are you still not understanding that this is the case?
>
>Furthermore, the box can be used to reduce the effects of overly
>compressed streams. For example, to then re-encode an incoming stream
>into a multiplexed stream. Or as a filter in a receiver.
>
>Are you still not understanding that this is the case?
>
>As I said, you argued yourself around full circle, and you're still
>stubbornly holding on. It's an amazing gift you have. You initially
>insisted that this box was only as a receiver's filter. Do I need to
>quote your words back to you?
>
>Bert
>
>
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