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    <p>Here's a complete example for you which should get you started</p> <pre><code>import java.io.*; import java.util.Scanner; import java.util.regex.Pattern; class Test { public static void main(String[] args) throws IOException { ProcessBuilder pb = new ProcessBuilder("ffmpeg","-i","in.webm","out.mp4"); final Process p = pb.start(); new Thread() { public void run() { Scanner sc = new Scanner(p.getErrorStream()); // Find duration Pattern durPattern = Pattern.compile("(?&lt;=Duration: )[^,]*"); String dur = sc.findWithinHorizon(durPattern, 0); if (dur == null) throw new RuntimeException("Could not parse duration."); String[] hms = dur.split(":"); double totalSecs = Integer.parseInt(hms[0]) * 3600 + Integer.parseInt(hms[1]) * 60 + Double.parseDouble(hms[2]); System.out.println("Total duration: " + totalSecs + " seconds."); // Find time as long as possible. Pattern timePattern = Pattern.compile("(?&lt;=time=)[\\d.]*"); String match; while (null != (match = sc.findWithinHorizon(timePattern, 0))) { double progress = Double.parseDouble(match) / totalSecs; System.out.printf("Progress: %.2f%%%n", progress * 100); } } }.start(); } } </code></pre> <p><strong>Output:</strong></p> <pre><code>Total duration: 117.7 seconds. Progress: 7.71% Progress: 16.40% Progress: 25.00% Progress: 33.16% Progress: 42.67% Progress: 51.35% Progress: 60.57% Progress: 69.07% Progress: 78.02% Progress: 86.49% Progress: 95.94% Progress: 99.97% </code></pre> <p>You may also consider using some kind of Java bindings for ffmpeg such as <a href="http://code.google.com/p/jjmpeg/">jjmpeg</a> which may provide what you need in a more robust way.</p> <p><em>EDIT</em></p> <p>With ffmpeg 2.0, time output is <code>HH:mm:ss.S</code> so the <code>timePattern</code> needs a to incorporate a <code>:</code></p> <pre><code>Pattern timePattern = Pattern.compile("(?&lt;=time=)[\\d:.]*"); </code></pre> <p>In addition, the <code>dur</code> will need to be split on <code>:</code> and summed together</p> <pre><code>String[] matchSplit; while (null != (match = sc.findWithinHorizon(timePattern, 0))) { matchSplit = match.split(":") double progress = Integer.parseInt(matchSplit[0]) * 3600 + Integer.parseInt(matchSplit[1]) * 60 + Double.parseDouble(matchSplit[2]) / totalSecs; //... </code></pre>
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    1. POHow to read ffmpeg response from java and use it to create a progress bar?
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    1. POHow to read ffmpeg response from java and use it to create a progress bar?
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    1. CONote that the whole program freezes on the question `File 'out.mp4' already exists. Overwrite ? [y/N]` if the file exists.
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    2. COyes... I know that... that is why I was giving the command: `String[] command = {"gnome-terminal", "-x", "/bin/sh", "-c","ffmpeg -i /home/tmp/F.webm /home/tmp/converted1.mp4"};` So that it opens up a terminal while doing this process but when i do this i can't get the errorstream of ffmpeg process... that is where then I got stucked and even stucked now... I was getting the output with only the ffmpeg command as u have given in above code.. but then it will freeze if the file already exists...
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    3. COAha. Well, you can't get the ffmpeg output if it's running inside a gnome-terminal. Check if the file exists using `File.exists` before launching `ffmpeg`.
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