The Serviio guys stated that MP4 container is not stream-friendly, especially opening it while still writing to a partial container. i'm not that much into such details, this would need more effort to delve into on my side. AFAIK they implemented support for WMA and OGG/FLAC only in 3.0.4? There was no record of improved video codec support. Do you have a reference? There's a 3.0.5 in the wild too... Anyway, i apologize for capturing the thread.