I heard Marco Arment say the mp3 file format is simple enough you can splice in ads without having to re-encode and he was seeing companies doing this. This wa

I heard Marco Arment say the mp3 file format is simple enough you can splice in ads without having to re-encode and he was seeing companies doing this. This was in the context of him implementing file seek and play percentage in his podcast player--both get gnarly with VBR and ads that vary in length.