Oh wait...
> 
>> then I get raw PCM of each chunk and replace some parts of PCM with sine
>> wave data (adding beeps) and then I transform that PCM chunks to mp3 chunks
>> and write those to stream. The final process of concating audio parts is *NOT
>> *performed by ffmpeg, I just write data chunks to the destination stream.

Are you trying to concat mp3 chunks? That seems like a bad idea,
Concat the raw PCM, then convert that to mp3

bouke


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