Re: Question on compression
- From: "Neil Smith [MVP Digital Media]" <neil@xxxxxxxxxx>
- Date: Sat, 03 Jun 2006 17:03:13 GMT
Do you mean in the WM format / WM Encoder package ?
There are lossless audio codecs (go to about 60-75% of original size),
but nothing specifically lossless for video. Screen capture codecs can
come close, but have very limited uses and aren't practical for video
(though they're pretty good for 16 bit desktop window capture)
A lot of the higher video bitrate codecs though can produce results
pretty much indistinguishable from the original.
They take a lot of processing power (eg the WMV9 advanced profile or
H264 on Quicktime) so as I said if you've got a mystery embedded
system, I've no idea if it can cope with that level of data throughput
in addition to its usual tasks.
Unfortunately your application is described in not too much detail, so
it's hard to know exactly how to get the best compression without
knowing the specifics of the application. I'm not really clear about
the need for RGB in the compressed file too, and this incurs an extra
performance penalty in the WMF space because the internal format
doesn't use RGB.
Cheers - Neil
On Sat, 3 Jun 2006 08:17:02 -0700, RonC
<RonC@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Neil,------------------------------------------------
Thanks for your response. I will try huffyyuv for now. It seems that they
have WMplayer covered as far as codec usage as well. Are there any lowloss
algorithms available? I might want to try one on the users even though they
have said lossless.
Cheers,
RON C
"Neil Smith [MVP Digital Media]" wrote:
On Fri, 2 Jun 2006 12:10:02 -0700, RonC
<RonC@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
I might be asking this in the wrong area. If si, please direct me to aplce
where I can get an answer.
I have a program on a imbedded system (non-Windows) that now creates a raw
rgb AVI video output. Naturally the bandwidth is a problem as the usage has
increased. The ccd size has increased also. I would like to insert a
lossless (a must!!) compression algorithm/codec into the program so that the
bandwidth problems are reduced. Compression to 1/4 the size or smaller is a
must.
Can anyone help me with what lossless compression algorithm/codec is
available in c/c++ source so that the output will be a compatible AVI file
usable in Windows Media Player and the like? Must be lossless and rgb.
If no one here has an answer, who might I contact?
I appreciate your help in advance.
I have no idea ! Usually people want to compress lossily to gain
maximum compression, where you seem to need to maintain 100% fidelity
instead. Hopefully somebody else will have a suggestion, though I did
notice on the 100fps site they mentioned HuufYUV which may be close to
what you need (though not RGB :-p)
http://www.100fps.com/file_sizes_of_lossless_compression.htm
http://neuron2.net/www.math.berkeley.edu/benrg/huffyuv.html
Since it's a free codec it could be possible to gain the source and
write in your RGB requirement.... it's also very small and quite fast,
so it could well suit an embedded system with limited CPU resources.
Cheers - Neil
------------------------------------------------
Digital Media MVP : 2004-2006
http://mvp.support.microsoft.com/mvpfaqs
Digital Media MVP : 2004-2006
http://mvp.support.microsoft.com/mvpfaqs
.
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