- miniDV audio dropout?
- Posted by peter on July 23rd, 2006
When playing miniDV tapes from a different camcorder on my trv900, there is
frequent audio dropout. It sounds like a stutter a few times per minute.
These are costco TDK tapes recorded in SP (standard speed). The video is
rock solid.
In previous posts, people say this is caused by misalignment between
different camcorders. Are there camcorders I can used mostly for playback
that is less susceptible to dropout? I'm not looking to match the source
camcorder because I would have to buy many camcorders -- I get tapes from
many different people to edit.
- Posted by Richard Crowley on July 23rd, 2006
"peter" wrote ...
Are your heads clean?
Were theirs?
- Posted by PTravel on July 23rd, 2006
"peter" <nospam@nospam.com> wrote in message
news:vyNwg.11893$aW2.7858@trnddc03...
I shoot with a Sony VX2000 and transfer with a Sony TRV20. I've never had
any instance of dropout.
- Posted by Martin Heffels on July 23rd, 2006
On Sun, 23 Jul 2006 13:34:41 -0700, "PTravel" <ptravel@ruyitang.com> wrote:
The change of misalignment is small, and most of the time happens with LP
(but the OP recorded on SP).
Audio-drops also occur on drop-outs because of dirty heads, so try and
clean your heads. Your picture may look ok because it has a better
error-correction, but audio drops-out because the error-correction is less.
cheers
-martin-
--
"I'm full of dust and guitars." - Syd Barrett
07/07/06 The Crazy Diamond is now a star in heaven
- Posted by PTravel on July 23rd, 2006
"Martin Heffels" <spamalam@worldhello.com> wrote in message
news:7tq7c29vladbvd55o6tll9e7kc49ge82lv@4ax.com...
Hunh? Error correction is applied to the entire D-25 stream -- audio and
video aren't error-corrected separately (unless you're reviving that silly
"mitigated errors" discussion).
- Posted by Steve King on July 23rd, 2006
"PTravel" <ptravel@ruyitang.com> wrote in message
news:4iia6lF3u3rrU1@individual.net...
To the OP --- Are you absolutely shure that picture is okay? I had a
drop-out occur with a tape recorded SP that was first noticed as an audio
drop-out. At first the picture seemed fine in regular viewing; however,
when examining picture zoomed into single frame level, I found small blocky
errors in several frames, where the audio drop-out occurred.
Steve King
- Posted by Martin Heffels on July 23rd, 2006
On Sun, 23 Jul 2006 15:06:14 -0700, "PTravel" <ptravel@ruyitang.com> wrote:
Video can be copied from other frames in the error-correction, making the
correction usually invisible, but you can't copy audio-samples from another
frame, because that would be audible. If audio drops due to a drop-out,
that means there was a severe drop-out, which couldn't be corrected by the
inner and outer-correction parities.
cheers
-martin-
--
"I'm full of dust and guitars." - Syd Barrett
07/07/06 The Crazy Diamond is now a star in heaven
- Posted by Richard Crowley on July 23rd, 2006
"PTravel" wrote ...
Sorry. Small video errors are frequently corrected/
mitigated so well you likely wouldn't notice them
even on a still-frame (because video frames are
frequently so similar from frame-to-frame.
But there is no equivalent mitigation for failure of
the audio bitstream. The ear is much more sensitive
to minute failures than the eye.
Actually there *are* separate handling of the video
and audio bitstreams if you want to take the time to
read some of those references from the "silly mitigated
errors discussion".
But you don't have to understand how it works (or
even believe other's explanations) in order to use
and enjoy it.
- Posted by PTravel on July 24th, 2006
"Martin Heffels" <spamalam@worldhello.com> wrote in message
news:m1u7c21cql5sall6br1nmlqlru7l7k107t@4ax.com...
Right -- your "mitigated errors" theory.
- Posted by PTravel on July 24th, 2006
"Richard Crowley" <rcrowley@xpr7t.net> wrote in message
news:12c80ar3iggnceb@corp.supernews.com...
Well, we're back to this. Since no one has been able to define
"frequently," I don't see any purpose in this discussion.
- Posted by Martin Heffels on July 24th, 2006
On Mon, 24 Jul 2006 05:54:42 GMT, "PTravel" <ptravel@travelersvideo.com>
wrote:
No, we are not. You only seem to come back to that discussion, because of
your lack of understanding error-correction in DV25. If you would
understand this, then you would know that audio-errors can't be corrected
as good as video.
If you would search the net a bit, you would find plenty of documents which
support my "theory" :-)
-m-
--
"I'm full of dust and guitars." - Syd Barrett
07/07/06 The Crazy Diamond is now a star in heaven
- Posted by Richard Crowley on July 24th, 2006
"PTravel" wrote ...
OK
- Posted by PTravel on July 24th, 2006
"Martin Heffels" <spamalam@worldhello.com> wrote in message
news:6uo8c21b300bdnjj05eojnga0ka64i0tc6@4ax.com...
And not one of them tells how often a mitigated error occurs.
- Posted by Martin Heffels on July 24th, 2006
On Mon, 24 Jul 2006 08:11:27 -0700, "PTravel" <ptravel@ruyitang.com> wrote:
I know, but that is not important for this discussion. Fact is that audio
can't be corrected as good as video in case of drop-outs on DV25. Whether
you see it or not, and it doesn't matter how many times it happens, the OP
had a occurance and was wondering why, so Crowley and I explained this to
him in terms of error-correction.
-m-
--
"I'm full of dust and guitars." - Syd Barrett
07/07/06 The Crazy Diamond is now a star in heaven
- Posted by PTravel on July 24th, 2006
"Martin Heffels" <spamalam@worldhello.com> wrote in message
news:9jp9c2h74a9s6ct2f3hr3ou2n98maffmn4@4ax.com...
Actually, you're right to this extent. In the context of the OP's inquiry,
it is within the universe of possible explanations for the audio drop-out
that was experienced. The question, though, is whether it is a likely
explanation. Absent any hard data on how often these "mitigated errors"
occur, I'll stick by my belief that it is extremely rare and therefore, less
likely than other explanations.
- Posted by Martin Heffels on July 24th, 2006
On Mon, 24 Jul 2006 10:39:52 -0700, "PTravel" <ptravel@ruyitang.com> wrote:
Yes, but the likelyhood stays, because the answer the OP found was head
misaligment. And of course, head misaligment leads to corrupt data, leads
to data-corretion....... and we're full circle again.
cheers
-martin-
--
"I'm full of dust and guitars." - Syd Barrett
07/07/06 The Crazy Diamond is now a star in heaven
