| Author |
Message |
Doc
Guest
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 Posted:
Mon Nov 07, 2005 11:59 am Post subject:
How can sound be out of sync on Firewire capture? Pinnacle S |
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After doing a 2hr capture via Firewire, on playback, I find the sound gets
progressively farther adhead of the video.
The capture was done via Firewire pass-through - i.e. Analog VCR Composite
out > Sony Dig8 Camcorder > Audigy 1394 Port captured with Pinnacle Studio
9 - w/update to 9.4.3 O/S is XP Home.
Several points that may or may not be significant:
1) The sync is off no matter what I play it in - PS9, Virtualdub, WinMedia
Player 9.
2) It didn't do this before on this same machine, same O/S using the same
copy of PS9 w/update, same camcorder, however with the following
alterations:
3) I recently did a clean install of WinXP since I got it w/XP installed
and no disks. Got a new OEM Copy of XP, no problems on the install. However,
this time I formatted the O/S drive to NTFS, whereas before it was FAT32. I
use a second dedicated video drive which was already previously formatted to
NTFS.
4) I installed the Main Concept DV codec so I'd have a DV codec for use with
Virtualdub. Previously had the free Panasonic DV codec installed but it
hasn't been installed since this most recent O/S installation.
5) Virtualdub file info shows 29.97 fps, Main Concept DV decompressor, 48khz
16bit stereo sound.
How can the sound be off on the original file if it's all dumped onto the
drive at the same time via Firewire? I've heard of this happening after it's
been rendered for DVD but on the original file?
I appreciate all shared wisdom.
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John F. Miller
Guest
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| Posted:
Mon Nov 07, 2005 8:56 pm Post subject:
Re: How can sound be out of sync on Firewire capture? Pinnac |
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Are your captured files Type 1 or Type 2 DV AVI?
Type 1 is a simple byte-for-byte copy of the DV data stream wrapped in a
suitable AVI header etc. The audio and video are stored together in each
frame.
Type 2 is basically Type 1 with a second copy of the audio stream stuck on
the end. A editor/player accessing this type of file can easily get out of
sync.
Full details at:
http://msdn.microsoft.com/library/en-us/directshow/htm/type1vstype2dvfiles.asp
(and links therein).
IMHO, Type 2 files are bad news and exist soley for backwards compatibility,
especially with Video for Windows (VfW) based apps rather than DirectShow.
Vendors of new apps should be ashamed of themselves if they still depend of
VfW.
Does your capture program allow a choice between Type 1 and Type 2?
If not, try capturing from the OS - with XP, you should see your camcorder
listed in My Computer. You can open it, see the video and capture to disk.
( I was astonished recently when trying Premiere Pro 1.5 to discover that
when you render a new DV file, it creates Type 2 files with one audio format
in the true DV data area and a different one in the audio copy area.)
As far as Pinnacle Studio 9 is concerned, there's a lot of low opinion about
it (well, Pinnacle in general) on this and similar NGs. I have no personal
experience with it.
John.
--
John Miller
http://www.enosoft.net/
high performance tools for music and video
"Doc" <docsavage20@xhotmail.com> wrote in message
news:e3Cbf.6312$AS6.3973@newsread3.news.atl.earthlink.net...
| Quote: | After doing a 2hr capture via Firewire, on playback, I find the sound gets
progressively farther adhead of the video.
The capture was done via Firewire pass-through - i.e. Analog VCR Composite
out > Sony Dig8 Camcorder > Audigy 1394 Port captured with Pinnacle
Studio
9 - w/update to 9.4.3 O/S is XP Home.
Several points that may or may not be significant:
1) The sync is off no matter what I play it in - PS9, Virtualdub, WinMedia
Player 9.
2) It didn't do this before on this same machine, same O/S using the same
copy of PS9 w/update, same camcorder, however with the following
alterations:
3) I recently did a clean install of WinXP since I got it w/XP installed
and no disks. Got a new OEM Copy of XP, no problems on the install.
However,
this time I formatted the O/S drive to NTFS, whereas before it was FAT32.
I
use a second dedicated video drive which was already previously formatted
to
NTFS.
4) I installed the Main Concept DV codec so I'd have a DV codec for use
with
Virtualdub. Previously had the free Panasonic DV codec installed but it
hasn't been installed since this most recent O/S installation.
5) Virtualdub file info shows 29.97 fps, Main Concept DV decompressor,
48khz
16bit stereo sound.
How can the sound be off on the original file if it's all dumped onto the
drive at the same time via Firewire? I've heard of this happening after
it's
been rendered for DVD but on the original file?
I appreciate all shared wisdom.
|
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| Back to top |
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Doc
Guest
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| Posted:
Mon Nov 07, 2005 9:37 pm Post subject:
Re: How can sound be out of sync on Firewire capture? Pinnac |
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"John F. Miller" <johnATenosoft.net> wrote in message
news:11muqpst0j1h583@corp.supernews.com...
| Quote: | Are your captured files Type 1 or Type 2 DV AVI?
|
How would I find out? It's not listed in the file properties under XP or
Virtualdub.
| Quote: | Does your capture program allow a choice between Type 1 and Type 2?
|
Not that I can find so far.
| Quote: | If not, try capturing from the OS - with XP, you should see your camcorder
listed in My Computer. You can open it, see the video and capture to
disk. |
Capturing from the OS? How is this accomplished?
| Quote: | As far as Pinnacle Studio 9 is concerned, there's a lot of low opinion
about
it (well, Pinnacle in general) on this and similar NGs. I have no
personal
experience with it.
|
I'm certainly no cheerleader for Pinnacle, had nothing but problems with PS8
but found PS9 seemed to work on my system - problems or lack thereof with
Pinnacle products seem to vary from one machine to the next - so I was
basically okay with it. But now I'm running into this issue.
I appreciate your input. |
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John F. Miller
Guest
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| Posted:
Mon Nov 07, 2005 11:35 pm Post subject:
Re: How can sound be out of sync on Firewire capture? Pinnac |
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See below.
--
John Miller
http://www.enosoft.net/
high performance tools for music and video
"Doc" <docsavage20@xhotmail.com> wrote in message
news:7xKbf.5341$2y.3708@newsread2.news.atl.earthlink.net...
| Quote: |
"John F. Miller" <johnATenosoft.net> wrote in message
news:11muqpst0j1h583@corp.supernews.com...
Are your captured files Type 1 or Type 2 DV AVI?
How would I find out? It's not listed in the file properties under XP or
Virtualdub.
|
A quick and dirty way is to open the AVI file in Notepad (really!).
Right-click/Open With... and choose Notepad. It might take a while. Make
sure Word Wrap is on, too. A Type 1 will start something like:
RIFF\§B AVI LISTÄA hdrlavih8 @o ° ?2 Ð @
LISTl@ strlstrh8 iavsdvsd è ¨a ?2 '
Ð@strf ÀàÀ?ÿ ÿÀàÀ?ÿ ÿÿÿàÿ?Èýÿÿÿÿÿÿÿÿÿindxø? 00dc
D @
A Type 2 will start something like:
RIFF\§B AVI LISTÌA hdrlavih8 @o ° ?2 Ð @
LISTt@ strlstrh8 vidsdvsd è ¨a ?2 '
Ð@strf( ( Ð @ dvsd?2 indxø? 00dc
D @
The key bit to look for is "iavsdvsd" or "vidsdvsd". iavs means interleaved
audio/video stream. vids means video stream.
Another way to tell is by comparing the file size compared to the
theoretical size for the number of frames in the file. If you know the
frame count, multiple by 120000 (NTSC) or 144000 (PAL). Compare this to the
size, in bytes, of the file (look at XP properties). For Type 1, the
calculated and actual will be very close. For Type 2, there will be an
extra amount roughly equal to the duration of the video in seconds
multiplied by the audio sampling frequency (e.g., 48,000Hz) multiplied by 2
(stereo) multiplied by 2 (16-bit = 2-bytes)).
I think the Notepad option is easier!
| Quote: | Does your capture program allow a choice between Type 1 and Type 2?
Not that I can find so far.
If not, try capturing from the OS - with XP, you should see your
camcorder
listed in My Computer. You can open it, see the video and capture to
disk.
Capturing from the OS? How is this accomplished?
|
See
http://www.microsoft.com/windowsxp/using/moviemaker/expert/bridgman_02february18.mspx
Also, when you connect a camcorder via FireWire, it will show up as a device
in Explorer (e.g., go to My Computer), much like a disk drive or CD-ROM
shows up. If you open it, you should see the video from the camcorder.
| Quote: |
As far as Pinnacle Studio 9 is concerned, there's a lot of low opinion
about
it (well, Pinnacle in general) on this and similar NGs. I have no
personal
experience with it.
I'm certainly no cheerleader for Pinnacle, had nothing but problems with
PS8
but found PS9 seemed to work on my system - problems or lack thereof with
Pinnacle products seem to vary from one machine to the next - so I was
basically okay with it. But now I'm running into this issue.
I appreciate your input.
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