[opendtv] Re: DTV Audio and video synchronization
- From: "Adam Goldberg" <adam_g@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 22 Mar 2008 20:44:18 -0400
Sorry, it seems that you and I are agreeing with each other.
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 8:07 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: DTV Audio and video synchronization
It's not. I was just saying (in maybe a not so clear way) that A/V sync
is a separate
issue than any Transport Stream buffering.
Typically, T-STD violations cause audio dropouts or momentarily frozen
pictures.
BTW, I cut my teeth on the T-STD model when I developed the TS output for
the dual-channel MPEG-2 encoder in the Motorola DCT-6412 and DCH-6416
cable boxes. I also fully characterized the A/V sync of the encoder with
test
patterns and an oscilloscope (which provides sub-millisecond accuracy).
Ron
Adam Goldberg wrote:
>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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