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error in ppm

Dear experts

i  tried for the scaling of the image using y4mscaler
            ls -1 dimas* | sort | xargs -n1 ppmtoy4m -F 25:1 | /y4mscaler-0.6.2-bin/y4mscaler -I sar=1:1 -O sar=PAL -O size=704*576 | mpeg2enc -f 8 -o video1.m1v

but i have some errors
            ERROR: Could not read YUV4MPEG header: system error (failed read/write)!
           xargs: ppmtoy4m: terminated by signal 13

what is this xargs terminated by signal 13  means and how should i solve it  

 i have installed the y4mscaler ...but it also says
           /y4mscaler-0.6.2-bin/y4mscaler: No match.

could you please tell me what is this problem all about and how to tackle it.
thanks for your patience
0
ldbkutty
Asked:
ldbkutty
1 Solution
 
Karl Heinz KremerCommented:
The xargs command collects as many file names as will fit on a command line, and then executes the command you specified. You do however specify that you only want 1 argument (-n 1) on the command line. This means that ppmtoy4m is called with one item.

You should concatenate your PPM files first, and then pipe this concatenated file into ppmtoy4m:

cat dimas* | ppmtoy4m -F 25:1 | ...

You may have to do this in several steps if your command line gets too long. You probably don't have to sort the output of ls: It's already sorted, and so is the "dimas*" when you cat it into ppmtoy4m.
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