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    <p>You can easily implement a progress bar if running ffmpeg. The output of ffmpeg while running is something like:</p> <pre><code>frame= 3366 fps=465 q=31.0 Lsize= 6474kB time=140.35 bitrate= 377.9kbits/s </code></pre> <p>And it is refreshed ~twice per second. You can parse that line and get the data you need to display the progress. When you run in the command line, you only see one line being updated all the time, but what ffmpeg does is to write the line followed by <b>\r</b>. That's why you don't see multiple lines. However, when using StreamReader.ReadLine() on the error output of the program, you get one line for every update.</p> <p>Sample code to read the output follows. You would have to ignore any line that does not begins with 'frame', perhaps use <a href="http://msdn.microsoft.com/en-us/library/system.diagnostics.process.beginerrorreadline.aspx" rel="noreferrer">BeginErrorReadLine()</a>+<a href="http://msdn.microsoft.com/en-us/library/system.diagnostics.process.errordatareceived.aspx" rel="noreferrer">ErrorDataReceived</a> if you want reading lines to be asynchronous, etc., but you get the idea (I've actually tested it):</p> <pre><code>using System; using System.Diagnostics; using System.IO; class Test { static void Main (string [] args) { Process proc = new Process (); proc.StartInfo.FileName = "ffmpeg"; proc.StartInfo.Arguments = "-i " + args [0] + " " + args [1]; proc.StartInfo.RedirectStandardError = true; proc.StartInfo.UseShellExecute = false; if (!proc.Start ()) { Console.WriteLine ("Error starting"); return; } StreamReader reader = proc.StandardError; string line; while ((line = reader.ReadLine ()) != null) { Console.WriteLine (line); } proc.Close (); } } </code></pre>
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    1. POC# and FFmpeg preferably without shell commands?
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    1. POC# and FFmpeg preferably without shell commands?
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    1. COAhh... I've been trying to redirect to standardOutput... not error. It suddenly works :P
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      1. USDominic Bou-Samra
    2. CO+1: I've done the same thing in Java and am very, very pleased with the results. There are a few catches, though: like the `time` value, can be something like 100000000 int the progress line output for the first update. My gut says it is an internal initialized value.
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      1. USStu Thompson
    3. COProbably yeah. Just use a predicate statement to eliminate values above a certain reasonable range. Dirty, but it'll work
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      1. USDominic Bou-Samra
 

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