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I was able to get a little further, please see third post down with an updated question.

Have you tested this outside of Hazel?

Also, when you get rid of the hard-coding, how do you determine which other files to concatenate with the file the rule matches?

Here's an update to my original post. I was able to get Hazel to concat using hard coded values and ffmpeg "concat protocol".

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ffmpeg -i concat:"video1.avi|video2.avi" -c copy output.avi

I'm trying to get it to work with variables but I get an error when the script runs saying it can't process the second file. No video output occurs.

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filename=$(basename "$1")
filename=${filename%.*}
converting_filenameHD="$filename-output.mpg"

ffmpeg -i concat:"$1" -c copy "converting_filenameHD"

Any idea how I can get the variables to work inside my script?

This is part of the question I asked earlier. You have one file. How do you determine the other files to concat with it. How are they related to the first file?

Mr_Noodle wrote:This is part of the question I asked earlier. You have one file. How do you determine the other files to concat with it. How are they related to the first file?

Sorry I didn't understand what you meant. The files are in the same folder. In the hardcoded version uses pipes to loop through files. That's where I'm stuck. I don't know how to loop through the files in the watch folder.

That's outside of the support I can give. You'll need to look up how to do that with shell scripting. You'll probably need to do a loop where you construct that argument by concat'ing the file names together.

Also, you shouldn't assume the cwd. Either use full paths or do a "cd" at the beginning of the script.