Insert an MP4A file in the Middle of another MP4A file

Question

I have a project requirement where I have to record two audio files and them insert the second file in the middle of the first file. It is a Cordova app currenlty I use cordova-plugin-media to do the recording by default on Android the file extension is MP4a. after recording I upload both files to the server. on the server I use NAudio to split the first file and then merje the 3 files together also using NAudio. The code is working the problem is that the seek on the Mobile is not working and I believe it is because the RIFF files is corrupted when the spliting and the concatinating was performed. So I am looking for a way to properly do these steps and have a valid RIFF file or a 3rd party .Net library that can perfrom these tasks. Thank you for all your input in advance.

Hussam Barouqa · Answer

If your resulting concatenated file has the correct audio data but its container has a problem that prevents it from working correctly (such as doesn't seek) you could try a simple multimedia conversion on this file in order to build a valid container from that audio data.. One way you could do this is through the DirectShow-based Convert Control from the LEADTOOLS Multimedia toolkit: https://www.leadtools.com/sdk/engine/multimedia Using the .NET edition of this control you can implement something like the following code: ConvertCtrl1.SourceFile = Input_File.mp4 ; ConvertCtrl1.TargetFile = Output_File.mp4 ; ConvertCtrl1.AudioCompressors.AAC.Selected = true ; ConvertCtrl1.TargetFormat = TargetFormatType .ISO; ConvertCtrl1.StartConvert(); // Note: Don't abort the process until conversion is done