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| Re: Viewing MPEGs created by ENVI/IDL [message #18752 is a reply to message #18746] |
Fri, 28 January 2000 00:00  |
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Steve[2]
Messages: 7
Registered: January 1999
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Junior Member |
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Chris Jengo wrote:
> Hi all,
> Has anyone had any luck viewing mpegs generated in ENVI? Starting with
> version 3.2, 3-D flythroughs can be output to mpg, which seems to work
> fine (I imagine using mpeg_open, mpeg_put, and all that, or directly
> using the object graphics routines). However, all my mpeg players say
> they can't play the movie because "it falls outside the constrained
> standard." These are standard mpeg players on a NT, like QuickTime,
> Windows Media Player, and some others. Does anybody know what decoder
> the developers expected the user to use? Thanks for any insights...
>
> Chris
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
Yes, I have to confer, this is most likely a problem with the MPEG frame
size.
Windows-XX doesn't really support MPEG, they support a subset of MPEG,
restricting
the frames size to what I consider to be fairly small (can't remember the
exact sizes,
but something like 240 pixels?). Anyways, you can try Vmpeg, it is a
freely distributable
MPEG player that has nice controls not found on the Windoze players (like
adjusting
the frame rate, play all frames, etc.), you can download it at:
http://www.udel.edu/ps/sw/vmpeg.exe
Which will give you an executable that will install Vmpeg on your Windows
system.
It will play MPEG-1 and MPEG-2. The MPEG players that come with Windows-XX
vary a lot, some will play some MPEGS. I have a short spiel about MPEG
players at
the bottom of my web page: http://www.nrel.gov/sss/spectrum.html , whith
some links
to different players (including Vmpeg).
I don't know about ENVI, but IDL generates MPEG-2, and some players won't
play
these right. Also, as of IDL 5.2, the mpeg routines do not give you full
control over
the compression. I use the Stanford MPEG-1 encoder and export the frames
from
IDL. Oh, by the way. The Quicktime for windows also sucks: although
Quicktime
for the Macintosh will play MPEG's without a hitch, Quicktime for Windows
doesn't
support MPEG at all (last I checked it didn't anyways). I guess this is
just Micro$oft's
way of telling you to use AVI (and Apples way of getting you to use a
Mac!).
Steve
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| Re: Viewing MPEGs created by ENVI/IDL [message #18753 is a reply to message #18752] |
Fri, 28 January 2000 00:00 |
thompson
Messages: 584
Registered: August 1991
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Senior Member |
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Chris Jengo <cjengo@my-deja.com> writes:
> Hi all,
> Has anyone had any luck viewing mpegs generated in ENVI? Starting with
> version 3.2, 3-D flythroughs can be output to mpg, which seems to work
> fine (I imagine using mpeg_open, mpeg_put, and all that, or directly
> using the object graphics routines). However, all my mpeg players say
> they can't play the movie because "it falls outside the constrained
> standard." These are standard mpeg players on a NT, like QuickTime,
> Windows Media Player, and some others. Does anybody know what decoder
> the developers expected the user to use? Thanks for any insights...
I'm not sure, but I believe that this error message refers to the size of the
MPEG movie frames. We've also run into problems with MPEGs running fine on
Unix machines but having problems on Windows machines. What I've been given to
understand is that some of the Windows players, particularly those from
Microsoft, assumed that the MPEGs would be restricted to the standard TV
resolution. You might try making smaller movies, and see if those play okay.
William Thompson
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