[opendtv] Re: DTV Audio and video synchronization
- From: Adam Goldberg <adam_g@xxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 22 Mar 2008 12:37:14 -0700 (PDT)
Yea but my leg hurt on that day and it doesn't anymore. Did they fix that too?
Must've.
The smoothing buffer has no effect on av sync.
Adam
adam_g@xxxxxxxxx
On Mar 22, 2008, at 3:33 PM, "John Willkie" <johnwillkie@xxxxxxxxxxxxx> wrote:
I know of a station that, because their "cable partner" complained of their
Scientific Atlanta encoders having "small buffers". The cable company had
their vendor in the plant, the broadcasters had their encoder vendor in the
plant, and they adjusted things until there were no lip-sync issues with the
cable firm.
I've looked at the transport stream. The audio is out of sync with the
video, where it wasn't before. They have sb_leak_rate = 0 and sb_size = 0
(both apparently legal ATSC values, if you ignore that a buffer needs to
have a size and needs to have a leak rate.)
This is at the other end of the spectrum to "no effect", me thinks.
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Adam Goldberg
Enviado el: Saturday, March 22, 2008 9:19 AM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: DTV Audio and video synchronization
Explain to me how the SB is at all related to av sync. (STD is loosely
associated)
Adam
adam_g@xxxxxxxxx
On Mar 22, 2008, at 7:40 AM, Ron Economos <w6rz@xxxxxxxxxxx> wrote:
Yes. Inother words, you can have a Transport Stream (ATSC or otherwise) that
is
fully T-STD compliant, yet wildly out of A/V synch.
Ron
Adam Goldberg wrote:
Note that the smoothing buffer can be legally specified as having a
sb_leak_rate of the maximum transport rate (19.39), which yields 'no effect'
smoothing buffer.
Adam Goldberg
adam_g@xxxxxxxxx
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Ron Economos
Sent: Saturday, March 22, 2008 5:54 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: DTV Audio and video synchronization
It does? Why?
Ron
John Willkie wrote:
Also, the smoothing_buffer_descriptor (technically used as a program
smoothing buffer descriptor in the ATSC world) also comes into play.
John Willkie
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