On Thu, 27 Jan 2005, Maarten de Boer wrote:
> > the following is (of course) sending me back an error
> >
> > find . -name \*.ppm | ppmtoy4m | blabla
>
> How about
>
> find . -name \*.ppm -exec ppmtoy4m {} \; | blabla
That won't work, as you can't just cat y4m streams together. The have headers
and interal structure that will be messed up. I wrote a program y4mcat that
lets you do this, but it wouldn't be useful in this case.
> find . -name \*.ppm | while read filename; do ppmtoy4m $filename; done |
Same problem, you can't cat the output from multiple ppmtoy4m streams together.
It'd be slower too, to restart ppmtoy4m for each frame.
You'd get better speed with something like:
find -name \*.ppm | xargs -n200 cat | ppmtoy4m
cat can't take 28800 files on the command line, but it can take more than 1.
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