Q. re: PiP audio mixing and HD audio - Blu-ray Forum

frank_t · 07-11-2008, 12:38 PM

If the main feature is in one of the HD audio formats (PCM;TruHD;DTS-MA) and you watch with a PiP-enabled movie, I would assume the player must mix together two audio streams?

In doing so, does the resultant audio stream maintain its HD characteristics? (i.e. is it still PCM/TrueHD/DTS-MA)?

Sorry for the lack of proper terminology here. Hope the question is understood.

thanks

Kilian · 07-12-2008, 06:22 AM

The primary audio stream is decoded to PCM.
The sub (secondary) audio stream is decoded to PCM.
The two are mixed as PCM.

The player can send the mixed PCM, or optionally re-encode/transcode it (currently only lossy) or convert PCM to analogue, depending on the player's hardware.

No current player has the hardware capabilities to re-encode PCM to lossless Dolby TrueHD or DTS-HD MA. It requires a lot of processing power which current players don't have and there is no point doing it when PCM will do.

07-11-2008, 12:38 PM	#1
frank_t Senior Member Member since:Jul 2007	Q. re: PiP audio mixing and HD audio If the main feature is in one of the HD audio formats (PCM;TruHD;DTS-MA) and you watch with a PiP-enabled movie, I would assume the player must mix together two audio streams? In doing so, does the resultant audio stream maintain its HD characteristics? (i.e. is it still PCM/TrueHD/DTS-MA)? Sorry for the lack of proper terminology here. Hope the question is understood. thanks

07-12-2008, 06:22 AM	#2
Kilian Member Member since:Nov 2007 Blu-ray reviews:1	PCM mainly The primary audio stream is decoded to PCM. The sub (secondary) audio stream is decoded to PCM. The two are mixed as PCM. The player can send the mixed PCM, or optionally re-encode/transcode it (currently only lossy) or convert PCM to analogue, depending on the player's hardware. No current player has the hardware capabilities to re-encode PCM to lossless Dolby TrueHD or DTS-HD MA. It requires a lot of processing power which current players don't have and there is no point doing it when PCM will do.

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