Thanks for this (URL="https://forum.xda-developers.com/showpost.php?p=75262097&postcount=201") excellent trick to make V4A and Dolby Atmos work together in Oreo rom.
This worked for me when I tried it after coming across your post thru' guitardedhero's OP for Dolby Atmos Oreo sound port. In fact, I have been trying to get both Dolby Atmos and V4A working together for about a month. I searched a lot on this issue and I learnt that the success varied from ROMs, Kernels and individual devices. So, it was a kind of a hit and miss. I even had it processing for about 10 seconds and suddenly losing it though I have a permissive kernel. But your solution proved to be a success to overcome V4A failing to process when Dolby Atmos was working alright.
BTW, I did notice that this trick works only for one track at a time and when I have to play the next track of a song album, I have to follow these steps all over again. Not a big problem though. But thought of checking with you if the V4A effects could be retained for a session if not until I reboot, say if I am listening to few songs at a stretch after making V4A to process using your trick. But there is no problem with Dolby Atmos though as it can be simply switched on and off whenever I need it. Thanks once again for your fantastic trick.
Originally Posted by docnok63
I decided to give another OP5 8.1 ROM a try and went with Candy. I tried to install DA without V4A and I bootlooped waiting on audioserver once again. The audioserver for candy is different than DU and thus the output from DA install is different. Zip attached.
[*] Third party audio effects and DSP's such as ViPER4Android
link to @docnok63
) may require some extra effort to allow processing due to Dolby Atmos' dependency on its output_session_processing music effect.[/LIST]