Shell Programming and Scripting

Trying to finish up my script that automates some video encoding work.

Situation: There is an MKV file to be transcoded.

Problem: MKVINFO will give a bunch of output about an MKV file, included in that output are two lines I am interested in:

Code:

|  + Default duration: 41.708ms (23.976 fps for a video track)
|   + Pixel width: 1280

Is there some way of echoing the output of from MKVINFO, and parsing down the two bits of information that I am looking for: fps (23.976) and pixel width (1280). I get the impression that this is doable, but I have only learned what little Bash I know from googling for examples, but I haven't found something similar to this in my looking.

Thanks, appreciate any help.

I'm on Mac OS X Snow Leopard 10.6.3. the command to run with mkvinfo is simply:

Code:

$ mkvinfo mkvfile.mkv

ballpark figure of about 100 lines of output from this command.

Try this:

Code:

mkvinfo mkvfile.mkv | 
awk '
/ Default duration:/ {sub(".*\(","");print $0 + 0}
/ Pixel width:/{print $NF}'

I tried that code exactly as shown above, and also as a 1 liner, but both times got this output:

Code:

awk: illegal primary in regular expression .*( at 
 source line number 2
 context is
	/ Default duration:/ >>>  {sub(".*\(","") <<<

Try nawk or /usr/xpg4/bin/awk on Solaris.

Regards

Or,

Code:

/home->awk -F "[ (]" '/Default duration:/ { print $(NF-5)} /Pixel width:/ {print $NF}' f
23.976
1280
/home->

working for me.

Is that trailing 'f' a typo?

Thanks.

that is filename.

you use in the same way:

Code:

mkvinfo mkvfile.mkv | awk -F "[ (]" '/Default duration:/ { print $(NF-5)} /Pixel width:/ {print $NF}'