Subprocess & ffmpeg

[Andrew Bloomgarden]

Hi, I'm having a problem with the subprocess module. I'm using it to  
run ffmpeg with the following command, where a_cmd is the command  
string.

proc = subprocess.Popen 
(a_cmd,shell=True,stdout=subprocess.PIPE,universal_newlines=True,stderr= 
subprocess.STDOUT,stdin=subprocess.PIPE)

Then, I'm trying to have access to the output while it's running.  
Just as a test, I used the following:

for line in proc.stdout:
	print line

It doesn't print out anything until ffmpeg is done executing. Now,  
this works with mencoder, but I have no idea why it won't work with  
ffmpeg.

Does anyone know why this is happening?

-- 
Andrew Bloomgarden
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