yeah. i figured out how to parse out the images. pretty simple.
i guess i'm still confused on what mjpegtools is targeted at if there is no
standard "header" nor format?
the lav tools expect an avi or quicktime, but what has to be inside the avi
container?
anyway, thanks for the kickstart and good luck with your projects!
-eric
On Dec 19, 2007 9:54 AM, Burkhard Plaum <[EMAIL PROTECTED]> wrote:
> Hi,
>
> er0ck schrieb:
> > aha! right you are!
> >
> [...]
> > so it's about 12 frames of jpegs (one of the "jpeg" must have wrapped
> over)
> > so maybe i don't need mjpeg tools? i just need to split up the
> > individual jpegs.
>
> Yes. It's one of those "multipart jpeg" files. It should be trivial to
> extract the individual images. Just parse the "Content-length:" fields.
>
> [...]
> > i had tried putting the mjpeg from the camera into an avi container
> thusly:
> > $>mencoder 20071203_205830.mjpeg -o 20071203_205830.avi -ovc copy -of
> avi
> > ....
> > Video stream: 51535.333 kbit/s (6441916 B/s) size: 3092120 bytes
> > 0.480 secs 12 frames
> >
> > and that worked as far as mplayer was concerned (obviously)
> > but what is strange is that file (or i guess the avi container) still
> > thinks there is an mjpeg encoded file inside:
> > $> file 20071203_205830.avi
> > 20071203_205830.avi: RIFF (little-endian) data, AVI, 1280 x 1024, 25.00
> > fps, video: Motion JPEG
>
> No, it's not strange it's exactly what it ought to be. Your mencoder
> command
> just extracts the JPEGs and puts them into an AVI
> container. The container is now AVI, but the video is still (M)JPEG.
>
> The distinction between JPEG and MJPEG is somewhat blurred at least as far
> as AVI is concerned. So simply packing JPEG files into an AVI makes the
> decoder think it's MJPEG.
>
> > although i don't know what the mjpeg header should look like.
>
> There is no standard MJPEG fileformat. There are some formats, which
> carry MJPEG data like SMJPEG or the multipart JPEG you have (and some
> others
> mainly used for Computer games). And AVI and Quicktime of course.
>
> Burkhard
>
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