using ffmpeg in Azure function to cut files using c#

Question

I have written an Azure function in C# which will cut a big mp4 files into some small duration. I have copied everything that is required (ffmpeg executeable, video file) in home directory via KUDU console. But when I run the the function it runs for more than 5 minutes and it doesn't give any files in the home directory.

Function :

using System;
using System.Diagnostics;

public static void Run(string input, TraceWriter log)
{
    log.Info("Executing");
    using (var process = new Process())
    {
        process.StartInfo.FileName = @"D:\home\ffmpeg.exe";
        process.StartInfo.Arguments = @"-i D:\home\AmnestyInternational.mp4 -ss 00:00:03 -t 00:00:08 -async 1 D:\home\cut.mp4";
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.RedirectStandardOutput = true;
        process.StartInfo.RedirectStandardError = true;
        log.Info(Directory.GetCurrentDirectory());
        log.Info("Cutting starts:"+DateTime.Now.ToString("h:mm:ss tt"));
        process.Start();
        string output = process.StandardOutput.ReadToEnd();
        process.WaitForExit();
        log.Info("Cutting ends :"+DateTime.Now.ToString("h:mm:ss tt"));
        log.Info(output);
    }
}

Output seen on Azure function Console:

2017-03-24T11:06:00.705 Function started (Id=df082f54-719a-415f-b7f1-b10548a213be)
2017-03-24T11:06:00.721 Executing
2017-03-24T11:06:00.721 D:\Windows\system32
2017-03-24T11:06:00.721 Cutting start :11:06:00 AM
2017-03-24T11:07:14  No new trace in the past 1 min(s).
2017-03-24T11:08:14  No new trace in the past 2 min(s).
2017-03-24T11:09:14  No new trace in the past 3 min(s).
2017-03-24T11:10:14  No new trace in the past 4 min(s).
2017-03-24T11:11:00.758 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.ManualTriggerCSharp1.

When I try to execute this same command on KUDU console or my own PC it only take 1.5 mins and I get a file of the desired duration

Could anyone please help me with this? What I might be missing?

maybe your computer is just faster than the cloudoption you booked? — Sebastian L
– Sebastian L, Commented Mar 24, 2017 at 11:19
Event when I am executing the above command in KUDU console it takes around 1.5 mins. — lonely
– lonely, Commented Mar 24, 2017 at 11:23
Did you check if you azure-vm has hardware acceleration for video transcoding? — Sebastian L
– Sebastian L, Commented Mar 24, 2017 at 11:31
I doubt it has, since you'd need an i7 or a mid/high end graphics card for it. but you can just check with the console which hardware you "have" an then check if it supports it. — Sebastian L
– Sebastian L, Commented Mar 24, 2017 at 12:25

Community · Accepted Answer · 2017-05-23 12:02:23Z

2

One improvement would be to get incremental progress updates from stdout, assuming that your process has output. I believe that ReadToEnd() will block until your process exits (and here it appears to timeout first). See some sync & async examples here: Process.start: how to get the output?

The maximum timeout for consumption plan is 5 minutes, but if you run your function on a dedicated app service then you can set the timeout to any value of your choice.

edited May 23, 2017 at 12:02

CommunityBot

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answered Mar 24, 2017 at 17:47

Matt Mason

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Comments

codeMonkey · Accepted Answer · 2019-01-22 07:22:08Z

0

I couldn't figure out why FFMPEG wasn't executing, until I realized I needed to be in the same folder as the EXE (in your case, D:\home). This was the line of code I was missing:

Directory.SetCurrentDirectory(@"D:\home");

After that:

process.StartInfo.WorkingDirectory = @"D:\home";
process.StartInfo.FileName = "ffmpeg.exe";

etc.

answered Jan 22, 2019 at 7:22

codeMonkey

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