Playing back motion jpeg saved by firefox

[CyberLeo Kitsana]

dfeustel at mindspring.com wrote:
> I just discovered that firefox can save motion video
> in addition to displaying it. But I don't know how
> to play back the saved video.cgi file. Mplayer
> complains about missing configuration data.
> 
> Does anyone know how to play back the file saved
> by firefox?

In this instance, firefox is simply saving the stream of data from the 
server, and giving it a name that matches the last path component in the 
URL (in this case, video.cgi). The format of the file is not likely to 
be understood by anything other than firefox (at least, as I've found), 
as it is most likely a multipart/mime-encoded file containing a sequence 
of images, like from an internet-enabled webcam.

Your best bet, if this is the case, is to use a mime parser to extract 
each of the individual pictures from the file, then use a proper video 
encoder to glue them together with the appropriate metadata to allow 
video players to understand them. Mplayer's mencoder can do so, and can 
even encode to MJPEG, for little to no loss in quality; although you may 
have issues choosing a proper framerate, as mime-based image streaming 
isn't always stable.

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-CyberLeo
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