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  • ffmpeg converted vertically stacked .mp4 videos are not playing on windows

    7 août 2017, par Kane

    I’m trying to merge two videos in a vertically stacked video using the ffmpeg vstack filter.

    ffmpeg -i movie01.avi -i movie02.avi -filter_complex vstack output.mp4

    It works great when i play it on VLC, but Windows Media Player and some Android devices can’t play the video file.

    Edit : also tried with the pad and overlay :

    ffmpeg -i movie01.avi  -i movie02.avi -filter_complex "[0:0]pad=iw:2*ih[a];[a][1:0]overlay=0:h" output.mp4

    but still the same, it doesn’t work on WMP and some Android devices.

    It is weird because the two separate videos work fine on Windows and Android, but not the merged one.

    Does someone know what I’m doing wrong ?

  • rtpenc : Fix some odd comments

    26 juillet 2013, par Martin Storsjö
    rtpenc : Fix some odd comments

    Some weird comments stem from the fact that the rtpdec and rtpenc
    
code was shared earlier.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DBH] libavformat/rtpenc.h

  • Can't execute FFMPEG command in C#

    15 août 2017, par JasonJerry

    I am trying to automate a HLS to mp4 FFMPEG encoding process in c# using this code :

    public static void startFFMPEG()
    
    {
    
        string url = hlsStream.getHLS();
    

    
        using (Process p = new Process())
    
        {
    
            p.StartInfo.UseShellExecute = false;
    
            p.StartInfo.CreateNoWindow = false;
    
            p.StartInfo.RedirectStandardOutput = true;
    
            p.StartInfo.FileName = "ffmpeg.exe";
    
            p.StartInfo.Arguments = $"-i {url} -c copy output.mp4";
    
            p.Start();
    
            p.WaitForExit();
    
        }
    

    
    }

    The code is doing what it should be but FFMPEG replies with the error

    Server returned 400 Bad Request

    The is weird because executing the command with the exact same arguments manually through a command prompt works fine.

    I also tried to use

            p.StartInfo.FileName = "cmd.exe";
    
        p.StartInfo.Arguments = $"ffmpeg -i {url} -c copy output.mp4";

    which resulted in a other FFMPEG error

    At least one output file must be specified

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