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POHow can i parse strings as the inputs to subprocess.Popen?
 

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  1. POHow can i parse strings as the inputs to subprocess.Popen?
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    <p>Here I tried to cut first and second 30sec long video file from "path/connect.flv" to the files output1.flv and output2.flv. It works. I able to concatenate these two files to form a new file "final.flv" of 60sec long. So this works and i am getting the outputs output1.flv [30sec], output2.flv[30sec] and final.flv[1min]. </p> <p>Here is the python code:</p> <pre><code>import subprocess ffmpeg_command1 = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:00", "-t", "00:00:30", "/home/xincoz/test/output1.flv"] ffmpeg_command2 = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:30", "-t", "00:00:30", "/home/xincoz/test/output2.flv"] ffmpeg_command3 = ["mencoder", "-forceidx", "-ovc", "copy", "-oac", "pcm", "-o", "/home/xincoz/test/final.flv", "/home/xincoz/test/output1.flv", "/home/xincoz/test/output2.flv"] subprocess.call(ffmpeg_command1) subprocess.call(ffmpeg_command2) subprocess.Popen(ffmpeg_command3) </code></pre> <p>But what i really want is to concatenate two strings out1 and out2 and concatinate these two to a file instead of concatenating "/home/xincoz/test/output1.flv" and "/home/xincoz/test/output2.flv". So how can i parse string out1 and out2 as the inputs to mencoder ? Please edit my code to achieve the result.</p> <pre><code>import subprocess,os ffmpeg_command = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:00", "-t", "00:00:30","-f", "flv", "pipe:1"] p = subprocess.Popen(ffmpeg_command,stdout=subprocess.PIPE) out1, err = p.communicate() ffmpeg_command1 = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:30", "-t", "00:00:30","-f", "flv", "pipe:1"] p1 = subprocess.Popen(ffmpeg_command1,stdout=subprocess.PIPE) out2, err1 = p1.communicate() ffmpeg_command2 = ["mencoder", "-forceidx", "-ovc", "copy", "-oac", "pcm", "-o", "/home/xincoz/test/final.flv", out1, out2 ] p2=subprocess.Popen(ffmpeg_command2) </code></pre> <p>Please help me. Thanks a lot in advance.</p>
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    1. COcould you tell us what the contents of out1 and out2 are?
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      1. USTom P
    2. COThanks for the reply @TomP. Its the binary data in output1.flv and output2.flv (ie, first and second 30sec binary data of the connect.flv). Here we are not creating output1.flv and output2.flv, instead we are taking the binary data to the strings out1 and out2.
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    3. COI believe Tom P was asking what the video and audio formats are since the format type can determine how to proceed with joining. It's fairly obvious that it is "binary data".
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