TV sucks
LSMFT
sound or screw up the picture or both. This country is going in the shit
tank.
--
LSMFT
Force shits upon the Back of Reason...
Ben Franklin-
cjt
> I haven't seen one program tonight that somebody didn't fuck up the
> sound or screw up the picture or both. This country is going in the shit
> tank.
>
>
>
Sylvia Else
> I haven't seen one program tonight that somebody didn't fuck up the
> sound or screw up the picture or both. This country is going in the shit
> tank.
>
Which country?
Sylvia.
Boris Mohar
>I haven't seen one program tonight that somebody didn't fuck up the
>sound or screw up the picture or both. This country is going in the shit
>tank.
I agree. I am in Canada with Rogers Cable. Sound is all over the place
from channel to channel and it also varies on the same channel. I am not
talking about loud commercials.
Regards,
Boris Mohar
Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca
void _-void-_ in the obvious place
(PeteCresswell)
> Sound is all over the place
>from channel to channel and it also varies on the same channel.
Can anybody comment on lip synch?
Seems like it was especially egregious in the months after
analog-digital cutover and has been slowly improving.
Or am I just wishing?
--
PeteCresswell
William Sommerwerck
On Comcast a few channels have imperfect lip sync. As to why -- I don't
know.
Jeff Liebermann
Probably the political channels. It's difficult to talk through both
sides of the mouth and get it right. However, it's most likely an
artifact of multiple transcoding.
--
Jeff Liebermann je...@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Meat Plow
I've only had a small problem with Discovery HD. Once in a while I get
some pixelation. Something you would expect with a less than adequate
signal. But that's not the case. And the cable company can't explain it.
--
Live Fast, Die Young and Leave a Pretty Corpse
Meat Plow
> On Mon, 7 Mar 2011 10:48:00 -0800, "William Sommerwerck"
> <grizzle...@comcast.net> wrote:
>
>>> Can anybody comment on lip sync?
>>
>>On Comcast a few channels have imperfect lip sync. As to why -- I don't
>>know.
>
> Probably the political channels. It's difficult to talk through both
> sides of the mouth and get it right. However, it's most likely an
> artifact of multiple transcoding.
LOL
Jeff Liebermann
wrote:
>On Mon, 07 Mar 2011 10:48:00 -0800, William Sommerwerck wrote:
>
>>> Can anybody comment on lip sync?
>>
>> On Comcast a few channels have imperfect lip sync. As to why -- I don't
>> know.
>
>I've only had a small problem with Discovery HD. Once in a while I get
>some pixelation. Something you would expect with a less than adequate
>signal. But that's not the case. And the cable company can't explain it.
This might add fuel to the fire. Note that this is from a cable
industry insider, published in a CATV industry journal:
<http://www.cedmagazine.com/articles/2011/02/ciciora-corner-can-you-hear-me.aspx>
Digital television has brought the scourge of “lip sync” errors.
Video signals and aural signals require vastly different
processing, which results in different amounts of processing time.
Unless appropriate additional artificial delay is added, the sound
and the video will end up out of synchronization. This difference
can accumulate if multiple conversions take place in the path from
the original source to the final display site. I’ve seen lip sync
discrepancies that were so bad, it appeared that the characters
were speaking another language and that the speech I was hearing
was dubbed in. The problem is so pervasive that my sound system
comes with a delay adjustment so that I can manually compensate at
home. That would be a reasonable solution if the delay was
constant from channel to channel, or even from program to program
on the same channel. But it is not.
On the home front, I've seen sound sync fall apart when ripping and
transcoding content from a DVD to some other video protocol. There
are tweaks for the problem, such as VLC which allows you to speed up
or slow down the audio using the "f" and "g" keys. You can also
"desync" the video and audio for a fixed user settable delay. The
problem is that controlling the sync seems to be too much of challenge
for broadcasters and cable companies. To make things worse, it seems
(to me) that different ATSC decoders have varying delays. It's
suppose to be controlled to between +15 and -45 msec but I'm beginning
to have my doubts:
<http://www.pixelinstruments.tv/articles.htm>
<http://www.pixelinstruments.tv/articles5.htm>
(Lots more on audio sync on the above URL).
Incidentally, if you also happen to notice that cable video doth suck,
you might find this article, from the same issue, rather illuminating:
<http://www.cedmagazine.com/articles/2011/02/transcoding-presto-change-o.aspx>
--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
# http://802.11junk.com je...@cruzio.com
# http://www.LearnByDestroying.com AE6KS
Meat Plow
Bookmarked for perusal tomorrow morning after coffee.
JR North
digital artifacts in the display, and frequent LOS, even on hard
cable.
JR
Boris Mohar
Yeah, that sucks too.
--
Boris
(PeteCresswell)
> Video signals and aural signals require vastly different
> processing, which results in different amounts of processing time.
Sounds like the digital TV standard(s) didn't include any means
for ensuring audio/video synch.
--
PeteCresswell
William Sommerwerck
I don't know if that's true, but many system controllers have the ability to
change the image/dialog offset.
Meat Plow
All a very good read. I've been around digital video since 1998. I've
worked with encoding/transcoding/etc.. for a decade. Current streaming
of popularity seems to be done in a TS (transport stream) container.
In order to get to that TS container obviously the raw video has to go
through several processes. Obviously there are not enough checks in place
to ensure the video and audio are sync'd.