| Author |
Message |
Mikl
Guest
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 Posted:
Sat Nov 27, 2004 6:00 pm Post subject:
Confused about avi-formats and compression |
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Hi
I'm capturing video from my Hauppage PVR-250. It captures in MPG-format,
but I want to edit it in Adobe Premiere Pro, so I want to convert it to
an AVI-format. Since it is already compressed when dumped from the
TV-card, I want to limit the number of recompressions to maintain the
quality of the material.
I use Virtualdub to convert between formats, but I'm in doubt of which
compression method to use. Right now I'm using uncompressed RGB as
target format, but that takes up space like crazy (2 gigs a minute). Can
I use another format that isn't too hard on the material quality-wise
and takes up less space? What do you suggest as a good compromise
between space and quality?
/Mikkel
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Steen Brandt
Guest
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| Posted:
Sat Nov 27, 2004 6:00 pm Post subject:
Re: Confused about avi-formats and compression |
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I will suggest that you use PicVideo Codec from Pegasys.
--
Steen Brandt
++++++++++++++++++
my email is a fake, don't use it! |
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Will Dormann
Guest
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| Posted:
Sat Nov 27, 2004 6:00 pm Post subject:
Re: Confused about avi-formats and compression |
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Mikl wrote:
| Quote: | Hi
I'm capturing video from my Hauppage PVR-250. It captures in MPG-format,
but I want to edit it in Adobe Premiere Pro, so I want to convert it to
an AVI-format. Since it is already compressed when dumped from the
TV-card, I want to limit the number of recompressions to maintain the
quality of the material.
I use Virtualdub to convert between formats, but I'm in doubt of which
compression method to use. Right now I'm using uncompressed RGB as
target format, but that takes up space like crazy (2 gigs a minute). Can
I use another format that isn't too hard on the material quality-wise
and takes up less space? What do you suggest as a good compromise
between space and quality?
|
Don't compromise! Frameserve! No temporary files, no need for lossy
codecs.
I'm not sure if Premiere Pro is frameserving-aware, though. If not,
you may have to use the VFAPI Converter as an intermediate step to
create a "stub" AVI to open. ReadAVS allows VFAPI Converter to open
..VDR files. I have download links to both applications here:
http://mythhelper.sourceforge.net/#What_are_the_requirements:
If you need more info on what frameserving actually is, read this:
http://www.doom9.org/index.html?/capture/frameserving.html
--
-WD |
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Mikl
Guest
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| Posted:
Sun Nov 28, 2004 12:08 pm Post subject:
Re: Confused about avi-formats and compression |
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Will Dormann wrote:
| Quote: | Mikl wrote:
Hi
I'm capturing video from my Hauppage PVR-250. It captures in
MPG-format, but I want to edit it in Adobe Premiere Pro, so I want to
convert it to an AVI-format. Since it is already compressed when
dumped from the TV-card, I want to limit the number of recompressions
to maintain the quality of the material.
I use Virtualdub to convert between formats, but I'm in doubt of which
compression method to use. Right now I'm using uncompressed RGB as
target format, but that takes up space like crazy (2 gigs a minute).
Can I use another format that isn't too hard on the material
quality-wise and takes up less space? What do you suggest as a good
compromise between space and quality?
Don't compromise! Frameserve! No temporary files, no need for lossy
codecs.
I'm not sure if Premiere Pro is frameserving-aware, though. If not,
you may have to use the VFAPI Converter as an intermediate step to
create a "stub" AVI to open. ReadAVS allows VFAPI Converter to open
.VDR files. I have download links to both applications here:
http://mythhelper.sourceforge.net/#What_are_the_requirements:
If you need more info on what frameserving actually is, read this:
http://www.doom9.org/index.html?/capture/frameserving.html
|
Hmm, can you explain to me in laymans terms? I don't get much of what
you said :-) It sounds interesting though
/Mikkel |
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Lyrik
Guest
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| Posted:
Sun Nov 28, 2004 5:25 pm Post subject:
Re: Confused about avi-formats and compression |
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Mikl wrote:
| Quote: | Hi
I'm capturing video from my Hauppage PVR-250. It captures in
MPG-format, but I want to edit it in Adobe Premiere Pro, so I want to
convert it to an AVI-format. Since it is already compressed when
dumped from the TV-card, I want to limit the number of recompressions
to maintain the quality of the material.
+++++++++++++++++++++++++++++++++ |
The formerly uncompressed avi-format has gone "out of use".
It made files that was to large and hard to handle.
The new avi-format is the DivX and other mpeg4 formats like XVID and the new
freegiven Microsoft mpeg4 wmv, which now can be obtained as a codec with the
avi extension.
No need to demand "uncompressed" for the maintainance of quality.
Just use any of the mentioned formats and give it the most "luxurious"
bitrate.
Then you can control the filesize of your film. You will not be able to se
the difrence from "uncompressed old avi".
Greets
jens |
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Will Dormann
Guest
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| Posted:
Sun Nov 28, 2004 6:03 pm Post subject:
Re: Confused about avi-formats and compression |
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Mikl wrote:
Hmm... Did you read the above URL?
It's taking the output from one program (VirtualDub) and *directly*
accessing that with another program. Without creating a temporary
file. If you're processing video with more than one program, it's the
only logical way to go.
For example:
echo "Hello" > tmp.txt && cat tmp.txt
and
echo "Hello" | cat
will produce the same output, but the latter makes much more sense
because it is more direct.
--
-WD |
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Octavian
Guest
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| Posted:
Mon Nov 29, 2004 12:09 am Post subject:
Re: Confused about avi-formats and compression |
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"Lyrik" <lyrikfjern@heaven.dk> wrote in message
news:cocg3p$20i0$1@news.cybercity.dk...
| Quote: | The formerly uncompressed avi-format has gone "out of use".
It made files that was to large and hard to handle.
The new avi-format is the DivX and other mpeg4 formats like XVID and the
new
freegiven Microsoft mpeg4 wmv, which now can be obtained as a codec with
the
avi extension.
No need to demand "uncompressed" for the maintainance of quality.
Just use any of the mentioned formats and give it the most "luxurious"
bitrate.
|
AVI is not a format. It's only a container. The video inside can be in just
about ANY format. Likewise the audio. |
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Billy Joe
Guest
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| Posted:
Mon Nov 29, 2004 12:10 am Post subject:
Re: Confused about avi-formats and compression |
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"Mikl" <spamikl@post.cybercity.dk> wrote in message
news:coa4mf$2vcn$4@news.cybercity.dk...
| Quote: | Hi
I'm capturing video from my Hauppage PVR-250. It captures in
MPG-format, but I want to edit it in Adobe Premiere Pro, so I
want to convert it to an AVI-format. Since it is already
compressed when dumped from the TV-card, I want to limit the
number of recompressions to maintain the quality of the
material.
I use Virtualdub to convert between formats, but I'm in doubt
of which compression method to use. Right now I'm using
uncompressed RGB as target format, but that takes up space
like crazy (2 gigs a minute). Can I use another format that
isn't too hard on the material quality-wise and takes up less
space? What do you suggest as a good compromise between space
and quality?
/Mikkel
|
Doesn't this somewhat depend upon your objectives??
For example, if all you are editing is cuts (removal of adverts
& redundancies), then MPEG editors, including the nanoPEG editor
shipped with the product, are OK. There are also some frame
accurate editors which provide features beyond cutting.
If your stand-alone player can handle formats outside the DVD
and/or MPEGISO specs, then VDub is a perfect front-end to either
Divx or Xvid codecs. MPEGISO capable players can take the H-250
output directly without conversion and/or "authoring" and MPEG4
savvy players certainly can.
If your interest is primarily time-shifted, disposable videos
then the MPEG cutter - DVD(RW) burner - MPEGISO player suite is
bested only by playing the MPEG video directly from the PC
before disposal.
If archiving the videos for some time is your objective, then
VDub's conversion to an MPEG4 encoding might be worth
consideration as the end product can consume 1/10 (or a smaller
ratio, if your choose) of the disc storage space. I mention the
1/10 value because I capture NTSC at 12 mbps and convert to
1.192 mbps Divx.
BJ |
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Will Dormann
Guest
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| Posted:
Mon Nov 29, 2004 12:10 am Post subject:
Re: Confused about avi-formats and compression |
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Mikl wrote:
| Quote: | Sorry, I was lazy and didn't read the link.
|
No comment.
| Quote: | It makes much sense and I
will definitely try it with Premiere. However, premiere has some
problems with decoding the original mpeg file fast enough to make it
suitable for editing (it does indeed try). Will frameserving be able to
make up for this somehow? The decoding will still be done on the fly I
guess?
|
Well, *something* has to be doing the decoding. If VirtualDub's decoder
is significantly faster than Premiere's decoder, then yes it could make
up for it. But it's unlikely.
--
-WD |
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Mikl
Guest
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| Posted:
Mon Nov 29, 2004 12:10 am Post subject:
Re: Confused about avi-formats and compression |
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Will Dormann wrote:
| Quote: | Mikl wrote:
Will Dormann wrote:
If you need more info on what frameserving actually is, read this:
http://www.doom9.org/index.html?/capture/frameserving.html
Hmm, can you explain to me in laymans terms? I don't get much of what
you said :-) It sounds interesting though
Hmm... Did you read the above URL?
It's taking the output from one program (VirtualDub) and *directly*
accessing that with another program. Without creating a temporary
file. If you're processing video with more than one program, it's the
only logical way to go.
For example:
echo "Hello" > tmp.txt && cat tmp.txt
and
echo "Hello" | cat
will produce the same output, but the latter makes much more sense
because it is more direct.
Sorry, I was lazy and didn't read the link. It makes much sense and I |
will definitely try it with Premiere. However, premiere has some
problems with decoding the original mpeg file fast enough to make it
suitable for editing (it does indeed try). Will frameserving be able to
make up for this somehow? The decoding will still be done on the fly I
guess?
/Mikkel |
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Mikl
Guest
|
| Posted:
Mon Nov 29, 2004 6:03 pm Post subject:
Re: Confused about avi-formats and compression |
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Will Dormann wrote:
| Quote: | Mikl wrote:
Sorry, I was lazy and didn't read the link.
No comment.
It makes much sense and I will definitely try it with Premiere.
However, premiere has some problems with decoding the original mpeg
file fast enough to make it suitable for editing (it does indeed try).
Will frameserving be able to make up for this somehow? The decoding
will still be done on the fly I guess?
Well, *something* has to be doing the decoding. If VirtualDub's decoder
is significantly faster than Premiere's decoder, then yes it could make
up for it. But it's unlikely.
|
Hey, it seems to be working great! And look at all the space I'm saving!
Thanks a lot!
/Mikkel |
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Will Dormann
Guest
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| Posted:
Tue Nov 30, 2004 6:03 am Post subject:
Re: Confused about avi-formats and compression |
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Mikl wrote:
| Quote: | Hey, it seems to be working great! And look at all the space I'm saving!
Thanks a lot!
|
Happy to help.
--
-WD |
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