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Subject: Re: [OMPI users] Open MPI instructional videos
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-06-04 08:31:31


FWIW: I tried the http://adi.loris.tv/ompi-optimized.avi URL on my Mac
and got redirected to the Quicktime plugin page. I had no idea which
plugin would make it play AVI files, so I skipped it. I tried the URL
on a Windows machine and Windows Media Player (i.e., what came up by
default) seemed to play the audio just fine, but it couldn't find a
video codec. Here's the error message that it showed:

     The codec you are missing is not available for download from this
site.
     You might be able to find it on another site by searching the Web
for
     "FMP4" (this is the WaveFormat or FourCC identifier of the codec).

That being said, if we can get a format that works nicely on multiple
platforms / is convenient for users, it would be great if you could
convert them for me -- thanks!

The entire web site is in a SVN repository (our mirrors just run "svn
up" every night): http://svn.open-mpi.org/svn/ompi-www/trunk. The
videos are under /video (the same directory structure of the web site).

On Jun 4, 2008, at 6:13 AM, Adrian Knoth wrote:

> On Wed, Jun 04, 2008 at 11:19:48AM +0200, Adrian Knoth wrote:
>
>> People usually recommend ffmpegX for OSX. You might give it a whirl
>> to
>> transcode your mov to something else, let's say H.264 in an AVI
>> container. (MP4/AVC, DivX, xvid, there are so many names for it)
>
> I've checked your files, they're quite good. They are already H.264
> and
> AAC (advanced audio coding), the only thing wrong is the mov
> container.
>
> It's easy to repack this to avi:
>
> $ mencoder input.mov -ovc copy -oac copy -o output.avi
>
> I've tested it with openib-btl-tuning:
>
> adi_at_chopin:/tmp$ ls -l openib-btl-tuning-v1.2.mov
> -rw-r--r-- 1 adi adi 16249094 Jun 4 11:24 openib-btl-tuning-v1.2.mov
>
> adi_at_chopin:/tmp$ ls -l ompi-test.avi
> -rw-r--r-- 1 adi adi 15964104 Jun 4 11:26 ompi-test.avi
>
> (you can download it here: <http://adi.loris.tv/ompi-test.avi>)
>
> On the other hand, the files are way too large. The video doesn't
> contain much inter-frame correlation, so it's a good idea to give the
> encoder some hints:
>
> adi_at_chopin:/tmp$ ls -l test*.avi
> -rw-r--r-- 1 adi adi 36171648 Jun 4 11:47 test.avi
> -rw-r--r-- 1 adi adi 35323842 Jun 4 11:58 testx264.avi
>
> (from approx. 160MB to 35MB). The first one is MPEG4 with an MP3 audio
> stream, the second is H.264. Both video encoders were forced to
> 100kbit/s
> and keyframes every 300 frames (not for x264):
>
> $ mencoder input.mov -oac mp3lame -ovc lavc -lavcopts \
> vbitrate=100:keyint=300 -o output.avi
>
> For testing purposes, try http://adi.loris.tv/ompi-optimized.avi
>
> I'd like to hear if these files, especially the last one, are
> working for
> other users.
>
> If so, I'd take care to convert the movs to avi, probably MPEG4.
>
> (in that case: Jeff, you could probably give me all files in an
> archive
> or point to a direct download link, so I don't have to click through
> the
> website but just fire up the encoder in the for loop)
>
> --
> Cluster and Metacomputing Working Group
> Friedrich-Schiller-Universität Jena, Germany
>
> private: http://adi.thur.de
> _______________________________________________
> users mailing list
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> http://www.open-mpi.org/mailman/listinfo.cgi/users

-- 
Jeff Squyres
Cisco Systems