CODEWITHSUNDEEP
c#videoffmpeg
alan samuel
alan samuel

Reputation: 425

How to speed up audio and video in FFmpeg

I am trying to speed up audio and video to 4 times using a C# wrapper class for ffmpeg.

Here is how it looks.

     var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
        ConvertSettings convertSettings = new ConvertSettings
        {
            CustomOutputArgs = "-filter_complex \"[0:v]setpts = 0.25 * PTS[v];[0:a] atempo=2.0[a],atempo=2.0[a] \" -map \"[v]\" -map \"[a]\""

        };

        string inputpath = tempvideolocation + "/tempvideo.mp4";
        string outputpath = tempvideolocation + "/convertedvideo.mp4";

        ffMpeg.ConvertMedia(inputpath, Format.mp4, outputpath, Format.mp4, convertSettings);

But i get "Error - Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_atempo_2 (exit code: 1)"

Upvotes: 1

Views: 1100

Answers (1)

llogan
llogan

Reputation: 133713

Linear filters do not need intermediate labels so change:

atempo=2.0[a],atempo=2.0[a]

to:

atempo=2.0,atempo=2.0[a]

Upvotes: 3

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