Originally Posted by HDfury
Yes so this update is useless for you, we need feedback from some one who had crack/pop while changing format between pcm <> bitstream
Perhaps I can add something useful here to troubleshoot this audio crack/pop issue...and also take the opportunity to ask a related question.
For traceability, my audio chain setup is as follows:
- Krell 707 3D pre/pro that DOES NOT process Dolby MAT
- Vertex 2 'AUDIO OUT' connects to one of the HDMI inputs of the Krell processor
- speaker setup is 5.2 (thus I can't accurately render Dolby Atmos)
- Since adding the Vertex 2 in my setup back in early July, I've set the ATV4k audio settings to 'change format - Dolby Digital 5.1'
and I don't recall experiencing any audio pops.
- However, for some Netflix titles (can't recall which ones), the Vertex 2 identifies the incoming audio signal to be "Bitstream
". Consequently, my audio processor displays Dolby Digital 5.1.
- Where is this bitstream pass through occurring in my audio chain? I thought that since TV iOS 12 was released, ATV4k doesn't allow bitstream...
- As of last week, I've changed my ATV4k's audio settings to 'best available and Dolby Atmos = OFF'
- which will pass L-PCM 'uncompressed audio' to my surround sound processor.
- In this configuration, when exiting any Netflix title for example, there's a slight fast acting 'pop' as the system goes to Netflix home menu. The pops aren't loud per se, nothing annoying, but certainly perceptible.
- Moreover, for those Netflix titles that were bitstreamed in Scenario 1, now Vertex 2 identifies and sends PCM 5.1/7.1 signals to my audio processor.
So the audio pops don't bother me, but I do have a related audio question, which is:
"is "Best Available" the recommended ATV4k audio setting?"
By all accounts, LPCM audio has no loss in quality as it is not compressed, so should be identical to DTS HD Master Audio/Dolby TrueHD (if derived from same file codec, not sure if Apple is doing some audio trickery). But over the years, I've been conditioned to always have my bluray player send bitstream audio to my AVR since its audio processing is typically superior to the source.