Originally Posted by sotti
TrueHD doesn't have a core track.
All the setops do real time re-encode to DD
True, but a TrueHD audio track in a BD movie usually (perhaps always) has an 'embedded' AC3 audio track (as everybody notices it with eac3to). This is a real AC3 track, not just real-time encoding from TrueHD to AC3. This is clearly seen using ffdshow Audio Decoder with the following settings:
- Codecs > TrueHD: disabled
- Output > Pass-through (S/PDIF, HDMI) > AC3: checked
When playing back a M2TS file with a TrueHD track, I see:
So the 'core/embedded' AC3 audio is extracted from the TrueHD track and sent to the receivier (I see the 'DD' indicator light up in the receiver).