ffmpeg set duration when converting

Question

I'm converting video with ffmpeg and after conversation duration is shown as 00:00:00.00. here is my passing arguments

"-i " + FileName + " -ar 22050 -b 500k -f flv -t " + Duration + " " + outputfile

Which is rendered by my code to

-i 1.mov -ar 22050 -b 500k -f flv -t 00:03:34.99 1.flv

what am I missing?

Answer 1

I see the same problem in a test I just ran. This appears to be a known issue in ffmpeg. For flv, it does not properly write all of the metadata, including the duration. You can use flvtool2 to fix the metadata for you. Just run:

flvtool2 -UP file.flv

and it will automatically find the duration based on the timestamps and write the metadata to the file. I just tried it and it worked great.

Answer 2

filargs = "flvtool2 -UP " + outputfile;
            proc = new Process();
            proc.StartInfo.FileName = spath + "flvtool2.exe";
            proc.StartInfo.Arguments = filargs;
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.CreateNoWindow = false;
            proc.StartInfo.RedirectStandardOutput = false;

            proc.Start();

            proc.WaitForExit();
            proc.Close();

I've tried this, no effect, duration is still 0. where "outputfile" is my converted file who has no duration

Answer 3

I've solved my problem

static void Fix(string Path)
        {
            string spath;
            spath = AppDomain.CurrentDomain.BaseDirectory;
            string filargs = "-U " + Path;
            Process proc1 = new Process();
            proc1.StartInfo.FileName = spath + "flvtool2.exe";
            proc1.StartInfo.Arguments = filargs;
            proc1.StartInfo.UseShellExecute = false;
            proc1.StartInfo.CreateNoWindow = false;
            proc1.StartInfo.RedirectStandardOutput
= false;
            proc1.Start();
            proc1.WaitForExit();
            proc1.Close();
        }

it does the perfect job