[FFmpeg-user] Noticeable transitions between audio chunks

[Bouke / edit 'B]

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