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• Wav file conversion/resampling options in C#

  7 juin 2021, par oceansmoving

  Background :

  


  Trying to convert various wav files to a format that is accepted by the game CS:GO.
So as you can see below in the source code for a VB application that is successfully doing this (https://github.com/SilentSys/SLAM/blob/master/SLAM/Form1.vb), it's supposed to be :

  


  

  • Mono

  


  • 16 Bit

  


  • 22050hz

  


  


      Private Sub FFMPEG_ConvertAndTrim(inpath As String, outpath As String, samplerate As Integer, channels As Integer, starttrim As Double, length As Double, volume As Double)
        Dim convert As New FFMpegConverter()
        convert.ExtractFFmpeg()

        Dim trimstring As String
        If length > 0 Then
            trimstring = String.Format("-ss {0} -t {1} ", starttrim.ToString("F5", Globalization.CultureInfo.InvariantCulture), length.ToString("F5", Globalization.CultureInfo.InvariantCulture))
        End If

        Dim command As String = String.Format("-i ""{0}"" -n -f wav -flags bitexact -map_metadata -1 -vn -acodec pcm_s16le -ar {1} -ac {2} {3}-af ""volume={4}"" ""{5}""", Path.GetFullPath(inpath), samplerate, channels, trimstring, volume.ToString("F5", Globalization.CultureInfo.InvariantCulture), Path.GetFullPath(outpath))
        convert.Invoke(command)
    End Sub


  


  Now, the thing is I have very little experience with VB, and as it is C# I am trying to learn I don't want this to be a showstopper.

  


  I have been able, in various ways to convert files that seem to be the correct format and can be played by normal media players, but is not accepted by the game, like the files converted with VB.

  


  The different methods I've been trying without success :

  


              int outRate = 22050;


  


              using (var reader = new MediaFoundationReader(inFile))
            {
                var outFormat = new WaveFormat(outRate, 1);
                using (var resampler = new WaveFormatConversionStream(outFormat, reader))
                {
                    WaveFileWriter.CreateWaveFile(outFile, resampler);
                }
            }


  


  Next one gives me an error that everyone is referring to the LT version of the package to solve, that in turn requires license...

  


              var ffMpeg = new FFMpegConverter();

            String args = $"-i '{@inFile}' -n -f wav -flags bitexact -map_metadata -1 -vn -acodec pcm_s16le -ar {outRate} -ac 1 '{@outFile}'";
            ffMpeg.Invoke(args);


  


  Another

  


          using (WaveFileReader reader = new WaveFileReader(inFile))
            {
                var outFormat = new WaveFormat(outRate, 1);
                using (var resampler = new MediaFoundationResampler(reader, outFormat))
                {
                    WaveFileWriter.CreateWaveFile(outFile, resampler);
                }
            }


  


  Another

  


                      FileStream fileStream = new FileStream(inFile, FileMode.Open);
                    WaveFormat waveFormat = new WaveFormat(22050, 16, 1);
                    var reader = new RawSourceWaveStream(fileStream, waveFormat);
                    using (WaveStream convertedStream = WaveFormatConversionStream.CreatePcmStream(reader))
                    {
                        WaveFileWriter.CreateWaveFile(outFile, convertedStream);
                    }
                    fileStream.Close();


  


• (issue) ffmpeg - usage of map & map_metadata options for correctly setting stream metadata & copying attachments

  1er mai 2022, par deep_rooted

  Using ffmpeg, I need to encode a series of video files with video, audio, subtitle and attachment streams (5 fonts). I would like to have all the streams in my output file while having fresh metadata for the audio and video streams (not copied from input).

  


  However I see that ffmpeg is quite troublesome in metadata management. Because it retains all input file metadata by default, including audio, video bitrate, file size etc. This is undesirable.

  


  After a lot of digging, I came up with the following solution which should work :

  


  ffmpeg -i input.mkv -map_metadata 0:s:t -map 0 -c:v libx264 -c:a libopus output.mkv


  


  The command above should copy all the streams, but will only copy metadata of the attachment files, since without attachment metadata, attachment streams can not be copied. This method skips copying audio, video metadata.

  


  But this does not work. It shows the following error :

  


  


  [matroska @ 000001d5fa6ad5c0] Attachment stream 3 has no filename tag.
Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument
Error initializing output stream 0:0 —

  


  


  For some strange reason, it says Attachment stream 3 (first font file) has no filename tag. If no map_metadata option is used & only -map 0 is used, there is no error. So I tried setting the font file name with -metadata:s:3 filename="test.ttf". This solved the issue at hand but brought the same issue for next font stream (s#4).

  


  Font Attachments have two metadata : (1) filename, (2) mimetype. It did not raise any issue for 2nd metadata. Honestly, it should not raise any issue for 1st metadata either, since these info should have been copied with -map_metadata 0:s:t Now of course I don't want to manually set all the font name, rather I would like to know a correct approach for this problem.

  


  I have of course tried -map_metadata -1. But same problem. Since no metadata is copied, it raises the same error that it can't copy the attachment streams without filename.

  


• Big question of Target size, or video bitrate must be specified when using two-pass

  14 juillet 2022, par Rojojun

  I tried to solve the error which is Target size, or video bitrate must be specified when using two-pass.

  


  But I couldn't find how to solve it and how to find path of video exactly I attached my code below this post

  


  Please give me some tips of solving the problem !

  


  @Service
public class ThumbnailService {

    public HashMap exportThumbnail(File file) throws Exception {
        // file is from controller and form-data
        //String inputPath = "Users/hojunna/Download/my/";
        //String outputPath = "/usr/local/video/thumbnail/";

        String ffmpegBasePath = "/opt/homebrew/bin/";
        FFmpeg ffmpeg = new FFmpeg(ffmpegBasePath+"ffmpeg");        
        FFprobe ffprobe = new FFprobe(ffmpegBasePath+"ffprobe");    
        
        FFmpegBuilder builder = new FFmpegBuilder()
                .setInput("/Users/hojunna/Desktop/" + file)                         
                //.overrideOutputFiles(true)                    
                //.addExtraArgs("-ss", "00:00:01")          
                .addOutput("/Users/hojunna/Desktop/test.jpg")       
                .setFrames(1)
                .setVideoFilter("select='gte(n\\,10)',scale=200:-1")
                .done();

        FFmpegExecutor executor = new FFmpegExecutor(ffmpeg, ffprobe);      
        executor.createJob(builder).run();                                  
        executor.createTwoPassJob(builder).run();                           

        HashMap resultMap = new HashMap();
        return resultMap;
    }
}