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• Video has no audio when played using HTML5

  4 mai 2013, par vertigoelectric

  I have a media site where I can upload video files. After upload, they are converted to MP4 using ffmpeg and then ffmpeg2theora converts that to OGV.

  I have recently discovered that some videos that I upload do not play any sound when using the HTML5 player in Firefox/Chrome, but do have sound when using the fallback Flash player in IE.

  I've downloaded and checked the processed files and they both still have sound, so the issue seems to be related to the HTML5 player rather than loss of audio during processing.

  I double-checked my ffmpeg command line and realized I didn't specify any audio options :

  ffmpeg2 -i "inputfile" -vcodec libx264 -profile:v baseline -level 3 "outputfile" 2>&1'

  Since only some of the files didn't play audio while some did, this led me to believe that the audio track was being copied directly during the processing and if the original file didn't have audio supported by HTML5, then it output file would have the same result.

  I realized this means I have to force re-encoding of the audio stream, so I tried a few things but had no success with any.

  I tried 'libfaac' as many online posts suggested, but this resulted in an 'unknown codec' error. Further reading led me to find that 'libfaac' was no longer included with ffmpeg builds. I must have gotten mine after that.

  I tried the "Native AAC" codec by simply using the following options :

  ffmpeg2 -i "inputfile" -vcodec libx264 -profile:v baseline -level 3 -acodec aac "outputfile" 2>&1'

  With this I got the following error : "Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height".

  The only codec that didn't give me some sort of error was 'libvo_aacenc'. However, even though the processing completed without error, I still got no audio when played in the HTML5 player.

  What am I doing wrong ?

  NOTE (just in case this is relevant) : This is currently being run on a Windows host using the ffmpeg executable, but we will soon be moving to a Linux host.

• ffmpeg binary for android not working

  29 juillet 2014, par Abdul Qadir

  I’ve copied the ffmpeg binary provided here in the res/raw folder into my project’s assets folder. Whenever I need to run ffmpeg commands, I copy the binary into data/data/my-package-name/ and run the following command to check if everything works.

  Process process = Runtime.getRuntime().exec(ffmpegBinaryFilePath + " -version");

  I get the output by logging the stream by process.getInputStream(). Everything works as expected. But the binary provided in the project is old (version 0.11.1) and I also need to enable lame library to work with mp3 extension. So I decided to build my own binary. I’ve build using this script and also another script showed here. When I place the build binary into my project’s assets folder. I get no output when I run the code above i.e. the log is empty. I’ve also tried building with this script but it doesn’t create any binary i.e. there is no bin folder when compilation is finished.

  I’ve made ndk related changes to these scripts i.e. changed NDK, PLATFORM and PREBUILT variables (I have ndk10 64bit) and changed --enable-shared --disable-static to --disable-shared --enable-static. Also cleared any references to other libraries in the --extra-cflags and --extra-ldflags. Do I need to make any more changes ? Any help would be appreciated !!

  EDIT :

  here’s the log file of my latest build
  http://justpaste.it/gfeb

• Is there a way to use ffmpeg binary on anroid platform in MAUI project ?

  18 août 2023, par Mrand

  Currently I'm working on my test project about capabilities of MAUI and ffmpeg, so I can create my own applications. I got stuck on problem about using ffmpeg on platforms other than Windows (for example Anroid).

  


  I tried googling the problem, didn't find anything helpful. Right now my ffmpeg for Android binary is situated inside Platforms/Android/Assets/libs as AndroidAsset. And I'm using code below to put my binary on Android to execute in the future

  


  protected override void OnCreate(Bundle bundle)
{
    base.OnCreate(bundle);

    if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.ReadExternalStorage) != Permission.Granted 
        || ContextCompat.CheckSelfPermission(this, Manifest.Permission.WriteExternalStorage) != Permission.Granted 
        || ContextCompat.CheckSelfPermission(this, Manifest.Permission.Internet) != Permission.Granted) 
    {
        ActivityCompat.RequestPermissions(this, new string[] {
          Manifest.Permission.ReadExternalStorage, Manifest.Permission.WriteExternalStorage, Manifest.Permission.Internet
        }, 0);
    }

    PrepareFFmpeg();
}

private void PrepareFFmpeg()
{
    var assetManager = Android.App.Application.Context.Assets;
    string path = "libs/ffmpeg";
    string destinationPath = Path.Combine(Android.App.Application.Context.ApplicationInfo.DataDir, "ffmpeg");

    var directoryPath = Path.GetDirectoryName(destinationPath);
    if (!Directory.Exists(directoryPath))
    {
        Directory.CreateDirectory(directoryPath);
    }

    using (var inputStream = assetManager.Open(path))
    {
        if (File.Exists(destinationPath)) 
        {
            File.Delete(destinationPath);
        }

        using (var outputStream = File.Create(destinationPath))
        {
            inputStream.CopyTo(outputStream);
        }
    }

    Java.Lang.JavaSystem.SetProperty("java.io.tmpdir", destinationPath);
    Java.Lang.Runtime.GetRuntime().Exec("chmod 700 " + destinationPath);

    FFmpeg.SetExecutablesPath(destinationPath);
}


  


  public static class FFmpegService
{
    public static async Task ConvertVideoAsync(string inputPath, string outputPath, string format)
    {
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            string ffmpegPath = GetFFmpegPath();
            string arguments = $"-i \"{inputPath}\" \"{outputPath}.{format}\"";

            ProcessStartInfo startInfo = new ProcessStartInfo
            {
                FileName = ffmpegPath,
                Arguments = arguments,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                UseShellExecute = false,
                CreateNoWindow = true,
            };

            using Process process = new Process { StartInfo = startInfo };
            process.Start();
            await process.WaitForExitAsync();
        }
        else
        {
            //IConversion conversion = await FFmpeg.Conversions.FromSnippet.Convert(inputPath, $"{outputPath}.{f*-  .ormat}");
            //string command = $"-i {inputPath} -f {format} {outputPath}";

            //ProcessStartInfo psi = new ProcessStartInfo();
            //psi.FileName = FFmpeg.ExecutablesPath;
            //psi.Arguments = command;
            //psi.RedirectStandardOutput = true;
            //psi.RedirectStandardError = true;
            //psi.UseShellExecute = false;

            //Process process = Process.Start(psi);
            //process.WaitForExit();

            //string output = process.StandardOutput.ReadToEnd();
            //string error = process.StandardError.ReadToEnd();

            string outputPathWithFormat = $"{outputPath}.{format}";
            IConversion conversion = await FFmpeg.Conversions.FromSnippet.Convert(inputPath, outputPathWithFormat);
            IConversionResult result = await conversion.Start();
        }
    }

    private static string GetFFmpegPath()
    {
        //string platformFolder = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? "Windows" : "Android";
        //return Path.Combine("Platforms", platformFolder, "ffmpeg", "ffmpeg");
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            return Path.Combine("Platforms", "Windows", "ffmpeg", "ffmpeg");
        }
        else
        {
            return null;
        }
    }
}


  


  I'm trying to use FFmpegService to convert video in any desired format I can by passing it in the arguments of the method (Windows works fine).

  


  In my service I also tried to use Xabe.FFmpeg but it always gives couldn't find part of path (path here). When using more manual approach I face another problem every time : Permission denied.
For path I tried /data/data/APPNAME and cache directories. It always results in problems mentioned above.

  


  I downloaded FFmpeg binary from this repository : https://github.com/tomaszzmuda/Xabe.FFmpeg/releases/tag/executables

  


  My goal is to get conversion working for any format and for at least two platforms : Android and Windows, but if you can tell me how to do it on other platforms as well - I would be grateful.

  


  Additional question : If you can tell me the best practice setting standard path for storing converted audio and video, thanks.

  


  If you need more details, please specify I would happily provide them.
P.S. : don't look at the quality of code, I tried to code this for week so I didn't care about quality, I just want to learn how can I do this.

  


  Thanks for your time and attention !

  


  Project : Maui Blazor .Net 7.0