Develop Bugs

Bad sound over Bluetooth in SUBARU car audio

Hi All,
I am a long Mi devices user and got my new mi6 this week and it seems like there is some issue with sound quality when connecting to car Audio (other audio devices like Plantronics headphones have no problem)
Any1 one know? any work around?
I am using the OOTB 7.1.1 NMF26X Android version with MIUI 9.0.2.0 NCAMIEI
Thanks,

LiranETN said:
Hi All,
I am a long Mi devices user and got my new mi6 this week and it seems like there is some issue with sound quality when connecting to car Audio (other audio devices like Plantronics headphones have no problem)
Any1 one know? any work around?
I am using the OOTB 7.1.1 NMF26X Android version with MIUI 9.0.2.0 NCAMIEI
Thanks,
Click to expand...
Click to collapse
What do you mean with bad sound? I'm having some lags and freezes with my car either.

felipefda said:
What do you mean with bad sound? I'm having some lags and freezes with my car either.
Click to expand...
Click to collapse
I mean like distortion...grating sound and not clean ... without disconnections

Works in my Toyota, no disturbed sound, but occasional lags (~every 10 minutes). I am on global beta 8.1.18

I have similar problem with my motorcycle Bluetooth intercom. Sounds like slowed-pitched down. woman voice like a man voice and bad quality. Any solution?

im having a subaru original player too sound over BT works flawlessy. used miui 9580, miui 10, havoc rom, now using xiaomi eu miui 10 weekly latest

ttayfun said:
I have similar problem with my motorcycle Bluetooth intercom. Sounds like slowed-pitched down. woman voice like a man voice and bad quality. Any solution?
Click to expand...
Click to collapse
I'm having the exact same problem with MIUI Global 10.2 Stable, 10.2.1.0 (OCAMIXM). Did you solve it? If so, how?
Thanks dude!

Bluetooth no media audio sound AAC, SBC codec -Redmi Note 5 Global 9.5.6.0 & 9.5.13.0

Bluetooth no media audio sound AAC, SBC codec -Redmi Note 5 Global 9.5.6.0 & 9.5.13.0
Redmi Note 5 Global 9.5.6.0 & 9.5.13.0 ROMS:
The media player plays the song, but there is no audio sound when I connect via Bluetooth the Redmi Note 5 phone to my Kenwood KMM-BT304 car headunit (Kenwood 2018 modell year, supoorts AAC and SBC codecs).
The car radio works fine with Redmi Note 5A, Samsung Galaxy S7, etc.
At the developer options AAC is the default codec.
If I manually change it to SBC, then works perfect.
But at the next time, when I connect to the car radio, there will be no media audio sound again... I have to set manually the SBC codec.
Is there any media patch what fixs this problem?

I have the same issue where no sound comes through my bluetooth headset on my RN5P Global 4/64, running AOSP Extended v5.5 Oreo 8.1.0, hope there is a fix for this soon Also haven't tried changing the audio codec, will try now
---------- Post added at 03:00 AM ---------- Previous post was at 02:07 AM ----------
Seems changing the codec etc doesn't help for me

absulutebeginner said:
Redmi Note 5 Global 9.5.6.0 & 9.5.13.0 ROMS:
The media player plays the song, but there is no audio sound when I connect via Bluetooth the Redmi Note 5 phone to my Kenwood KMM-BT304 car headunit (Kenwood 2018 modell year, supoorts AAC and SBC codecs).
The car radio works fine with Redmi Note 5A, Samsung Galaxy S7, etc.
At the developer options AAC is the default codec.
If I manually change it to SBC, then works perfect.
But at the next time, when I connect to the car radio, there will be no media audio sound again... I have to set manually the SBC codec.
Is there any media patch what fixs this problem?
Click to expand...
Click to collapse
what codec does the redmi note 5a and s7 use when you connect it with your kenwood?

devcon69 said:
what codec does the redmi note 5a and s7 use when you connect it with your kenwood?
Click to expand...
Click to collapse
Samsung Galaxy S7 Edge -Android 7.1 - bluetooth media audio works fine
Redmi Note 5A - Android 7.1 (MIUI 9.5.9.0) - bluetooth media audio works fine
Redmi Note 5 Global with Andorid 7.1 based ROM (MIUI 9.2.13.0) - bluetooth media audio works fine
Redmi Note 5 Global with Andorid 8.1 based ROMs (MIUI 9.5.6.0 & 9.5.13.0) - no media audio
Unfortunately in the Nougat based ROMS gives no information about the used codecs, in the developer options.
At the 8.1 based 9.5.13.0 ROM the media audios works temporary (until next BT connection restart) if I "Disable optional codes" (Developoer options / Bluetooth audio codec).

devcon69 said:
what codec does the redmi note 5a and s7 use when you connect it with your kenwood?
Click to expand...
Click to collapse
Mi6 and Pioneer car radio with bluetooth problem:
https://forum.xda-developers.com/mi-6/help/miui-9-5-3-0-bluetooth-audio-codec-t3774888
They says the codecs order is the problem, but I cant fix it, because in my build.prof there is no such a line:
persist.bt.a2dp_offload_cap=sbc-aptx-aptxhd-aac

absulutebeginner said:
Mi6 and Pioneer car radio with bluetooth problem:
https://forum.xda-developers.com/mi-6/help/miui-9-5-3-0-bluetooth-audio-codec-t3774888
They says the codecs order is the problem, but I cant fix it, because in my build.prof there is no such a line:
persist.bt.a2dp_offload_cap=sbc-aptx-aptxhd-aac
Click to expand...
Click to collapse
then add the line.

absulutebeginner said:
Samsung Galaxy S7 Edge -Android 7.1 - bluetooth media audio works fine
Redmi Note 5A - Android 7.1 (MIUI 9.5.9.0) - bluetooth media audio works fine
Redmi Note 5 Global with Andorid 7.1 based ROM (MIUI 9.2.13.0) - bluetooth media audio works fine
Redmi Note 5 Global with Andorid 8.1 based ROMs (MIUI 9.5.6.0 & 9.5.13.0) - no media audio
Unfortunately in the Nougat based ROMS gives no information about the used codecs, in the developer options.
At the 8.1 based 9.5.13.0 ROM the media audios works temporary (until next BT connection restart) if I "Disable optional codes" (Developoer options / Bluetooth audio codec).
Click to expand...
Click to collapse
---------- Post added at 03:09 AM ---------- Previous post was at 03:00 AM ----------
absulutebeginner said:
Mi6 and Pioneer car radio with bluetooth problem:
https://forum.xda-developers.com/mi-6/help/miui-9-5-3-0-bluetooth-audio-codec-t3774888
They says the codecs order is the problem, but I cant fix it, because in my build.prof there is no such a line:
persist.bt.a2dp_offload_cap=sbc-aptx-aptxhd-aac
Click to expand...
Click to collapse
This is present on build.prop located on vendor partition
persist.vendor.bt.a2dp_offload_cap=sbc-aac

Unfortunately doesn't help this lines in build.prof:
persist.bt.a2dp_offload_cap=sbc-aptx-aptxhd-aac
or
persist.vendor.bt.a2dp_offload_cap=sbc-aac
The Bluetooth media audio problem still present in the new 8.6.14. MIUI10 ROM.

added screenshot from MIUI 10 global beta
MIUI 10 global beta exposes all codecs under Developer options.
I am, however, unable to set my streaming codec to AAC when using allegedly AAC-supporting bluetooth headphones: https://www.soundcore.com/products/variant/spirit-x/A3451011
I can change the setting to AAC but it automatically switches to SBC 48 KHz when I start playing music. I'd need to check with other headphones to see if it's Xiaomi or Anker that's bamboozling me.

sagematt said:
MIUI 10 global beta exposes all codecs under Developer options.
I am, however, unable to set my streaming codec to AAC when using allegedly AAC-supporting bluetooth headphones: https://www.soundcore.com/products/variant/spirit-x/A3451011
I can change the setting to AAC but it automatically switches to SBC 48 KHz when I start playing music. I'd need to check with other headphones to see if it's Xiaomi or Anker that's bamboozling me.
Click to expand...
Click to collapse
It doesn't help us. In MIUI 10 there is no bluetooth changes.
https://xiaomi.eu/community/threads...-alpine-jvc-kenwood-pioneer-car-radios.44546/
https://forum.xda-developers.com/mi-6/help/miui-9-5-3-0-bluetooth-audio-codec-t3774888
tpaulussen xda user wrote:
I want to use my Mi6 on my car radio (Pioneer MVH-S300BT) by connecting via bluetooth. The connection is successful, but the bluetooth audio codec that the phone selects by default (AAC) doesn't give a sound. It only works when I go into the developer options and select the SBC codec by hand. This is annoying, since I need to follow all the steps everytime I want to connect both devices (it always starts the default AAC). I was wonderig if it is possibe to change some setting so the phone stays perminentsly on the SBC instead of going back to the AAC codec with every new connection?
I found this on a forum about changing the priority use of bluetooth audio codec, and ik comes close to what I am looking for:
Devices running Android 8.0 that support A2DP automatically gain the additional codec support. Device manufacturers may need to obtain separate licenses and binary blobs for some proprietary audio codecs. In addition to SBC, Android 8.0 supports the following codecs:
AAC
aptX
aptX HD
LDAC
Device manufacturers can choose which codecs their devices attempt to use first. Set the codec priorities by changing the following values in the file res/values/config.xml:
<!-- Configuring priorities of A2DP source codecs. Larger value means
higher priority. Value -1 means the codec is disabled.
Value 0 is reserved and should not be used here. Enabled codecs
should have priorities in the interval [1, 999999], and each
priority value should be unique. -->
<integer name="a2dp_source_codec_priority_sbc">1001</integer>
<integer name="a2dp_source_codec_priority_aac">2001</integer>
<integer name="a2dp_source_codec_priority_aptx">3001</integer>
<integer name="a2dp_source_codec_priority_aptx_hd">4001</integer>
<integer name="a2dp_source_codec_priority_ldac">5001</integer>
However, I could not apply this option since I was unable to find the file having these settings.
Therefore I hope someone here on the forum can help me finding the solution

absulutebeginner said:
It doesn't help us. In MIUI 10 there is no bluetooth changes.
https://xiaomi.eu/community/threads...-alpine-jvc-kenwood-pioneer-car-radios.44546/
https://forum.xda-developers.com/mi-6/help/miui-9-5-3-0-bluetooth-audio-codec-t3774888
tpaulussen xda user wrote:
I want to use my Mi6 on my car radio (Pioneer MVH-S300BT) by connecting via bluetooth. The connection is successful, but the bluetooth audio codec that the phone selects by default (AAC) doesn't give a sound. It only works when I go into the developer options and select the SBC codec by hand. This is annoying, since I need to follow all the steps everytime I want to connect both devices (it always starts the default AAC). I was wonderig if it is possibe to change some setting so the phone stays perminentsly on the SBC instead of going back to the AAC codec with every new connection?
I found this on a forum about changing the priority use of bluetooth audio codec, and ik comes close to what I am looking for:
Devices running Android 8.0 that support A2DP automatically gain the additional codec support. Device manufacturers may need to obtain separate licenses and binary blobs for some proprietary audio codecs. In addition to SBC, Android 8.0 supports the following codecs:
AAC
aptX
aptX HD
LDAC
Device manufacturers can choose which codecs their devices attempt to use first. Set the codec priorities by changing the following values in the file res/values/config.xml:
<!-- Configuring priorities of A2DP source codecs. Larger value means
higher priority. Value -1 means the codec is disabled.
Value 0 is reserved and should not be used here. Enabled codecs
should have priorities in the interval [1, 999999], and each
priority value should be unique. -->
<integer name="a2dp_source_codec_priority_sbc">1001</integer>
<integer name="a2dp_source_codec_priority_aac">2001</integer>
<integer name="a2dp_source_codec_priority_aptx">3001</integer>
<integer name="a2dp_source_codec_priority_aptx_hd">4001</integer>
<integer name="a2dp_source_codec_priority_ldac">5001</integer>
However, I could not apply this option since I was unable to find the file having these settings.
Therefore I hope someone here on the forum can help me finding the solution
Click to expand...
Click to collapse
Try using Soundabout or Mono mono-BT mono router from playstore.

Hi,
I have the same issue but these app not working with oreo.
Thanks.

devcon69 said:
Try using Soundabout or Mono mono-BT mono router from playstore.
Click to expand...
Click to collapse
Soundabout app: crash, doesn't start the app on MIUI 9.5.13.0
Mono-mono app: we would like to use stereo media audio sound (for example: listen stereo music via BT)

absulutebeginner said:
Soundabout app: crash, doesn't start the app on MIUI 9.5.13.0
Mono-mono app: we would like to use stereo media audio sound (for example: listen stereo music via BT)
Click to expand...
Click to collapse
+1

absulutebeginner said:
Redmi Note 5 Global 9.5.6.0 & 9.5.13.0 ROMS:
The media player plays the song, but there is no audio sound when I connect via Bluetooth the Redmi Note 5 phone to my Kenwood KMM-BT304 car headunit (Kenwood 2018 modell year, supoorts AAC and SBC codecs).
The car radio works fine with Redmi Note 5A, Samsung Galaxy S7, etc.
At the developer options AAC is the default codec.
If I manually change it to SBC, then works perfect.
But at the next time, when I connect to the car radio, there will be no media audio sound again... I have to set manually the SBC codec.
Is there any media patch what fixs this problem?
Click to expand...
Click to collapse
On my RN5 Pro with 9.5.13.0 rom am able to play music and calls on my Harman car infotainment without any problems.

I'm running into the same problem with a Kenwood DPX303 unit. Track information comes through, but no audio. Global model, firmware v9.5.17.0.

Same problem here on a Kenwood dpx 7000DAB.
Other phones zich as Motorola no problem.
Redmi note 5 global.

Maybe sismilar problem, bluetooth audio stuttering with my embedded Golf VII Bluetooth audio sound system.
I reported the bug on the MI website, you can confirm it if you have the same problem.
http://en.miui.com/thread-3230620-1-1.html
Tom.

I have no problem with various of Bluetooth headset, headphone, earphone and speaker. All play the sound properly and use SBC codec by default. It seems this is bug from Oreo itself. I remember someone ask the similar things in Automagic forum, and I just realize it now. I have flash RR 6.1. But the codec also reseted to default when we exit the developer option, same as in MIUI.
It seems there is no viable solution currently. I would use workaround if I encounter this problem. You will need automation app, which detect bluetooth connected event to certain device. Launch the developer option and use accessibility to scroll and change that codec option back to sbc. I prooftest the concept in Automagic, but you can use tasker + autoinput or other Automation app which support accessibility to do it. But yeah, it is too hassle for most users here, as not everyone use automation app.

Yeah you're right. However in my case I already tried a lot a tricks like change codec and so on. But at the end of the day nothing works better...
I'm very disappointed...

bluetooth audio issues in Pie?

After updating to Pie bluetooth audio turns useless because only for 10~30sec the audio is continous. after that short period harsh interruptions begin to happen until the audio stops. all this sequence in less than 1min.
my headset is JBL DUET Mini and work fine in other devices.. I verified this problem with spotify and YouTube.
I tried to change bluetooth audio setup in developer options but remains the same.
Anyone having the same issue? Any idea?
Thank you!

I've had the same issue in Oreo, and now in Pie. Though it's never gotten to the point where it stops; it just continues, horribly, 'til I stop it myself.
Tested with Vanilla Music, streaming via Bluetooth to an Amazon Echo, Echo Dot, and an Amazon Basics Bluetooth speaker. (jeez, never realised how much Amazon stuff I have lol)

Bluetooth is horribly broken on pie and its interferes with WiFi.
There is a new update for pie, can you check if it is still broken?

Poor playback to Anker portable bluetooth (4.0) speaker with crackling / stuttering noise interference when initiated from A2 Lite. Works fine from Laptop to Bluetooth speaker (A2 Lite disconnected), but v. poor from A2 Lite to speaker. NB. Same digital media.
Suspect Bluetooth problem with A2 Lite Pie 9.0 (OTA) version. V10.0.2.0.PDLMIFJ
Could be a CODEC issue?
Developer options show :
AVRCP 1.4 (Default)
Bluetooth audio codec streaming:SBC
audio sample rate: 44.1 khz
Audio bits per sample: 16 bits
Audio channel mode: Stereo
Playback quality: Best effort (adaptive bit rate)
updated: experiencing same issue when using Ausdom M04 Bluetooth headpones with A2 Lite

Javtor said:
After updating to Pie bluetooth audio turns useless because only for 10~30sec the audio is continous. after that short period harsh interruptions begin to happen until the audio stops. all this sequence in less than 1min.
my headset is JBL DUET Mini and work fine in other devices.. I verified this problem with spotify and YouTube.
I tried to change bluetooth audio setup in developer options but remains the same.
Anyone having the same issue? Any idea?
Thank you!
Click to expand...
Click to collapse
I have the same problem...
On Oreo there weren't problems, but since Pie it's really horrible
I hope this will be fixed or someone has an idea for that

whise1 said:
There is a new update for pie, can you check if it is still broken?
Click to expand...
Click to collapse
Newer than V10.0.2.0?
Bluetooth (audio streaming issue, lack of codecs) & WiFi (IPv6) is still broken.

ShadyTurtle334 said:
Newer than V10.0.2.0?
Bluetooth (audio streaming issue, lack of codecs) & WiFi (IPv6) is still broken.
Click to expand...
Click to collapse
Sorry i thought that there was a newer one.
I reverted back to oreo to fix my problems. My original post is here: https://forum.xda-developers.com/mi...pie-update-t3883829/post78532365#post78532365

AAC codec was removed in PIe, leaving only the low quality/high latency SBC codec. Hopefully the next update includes AAC as it is absolute bare minimum for a 2018 phone of this caliber.

kitaco said:
AAC codec was removed in PIe, leaving only the low quality/high latency SBC codec. Hopefully the next update includes AAC as it is absolute bare minimum for a 2018 phone of this caliber.
Click to expand...
Click to collapse
All codes were removed except that low quality low bandwidth sbc codec, it is reall low bandwidth broadcasting so you with have a lot of lag with Bluetooth, the aptx magisk module works but, you have to use Bluetooth headset for music, no loudspeaker or headphone jack will output music streams. I'm sure PIE is just a stable beta so hopefully the final version should qualcoms codec.

I also having this issue even already upgraded to:
Android version 9
Android security patch level January 5, 2019
Baseband version 953_GEN_PACK-1.182577.1.184854.2,953_GEN_PACK-1.182577.1.184854.2
Kernel version 3.18.120-perf-g783cd9f#1 Mon Jan 14 16:08:26 WIB 2019
Build number PKQ1.180917.001.10.0.3.0.PDLMIXM
Very annoying!
Previously on Oreo doesn't have this issue!

cronosmachine said:
I also having this issue even already upgraded to:
Android version 9
Android security patch level January 5, 2019
Baseband version 953_GEN_PACK-1.182577.1.184854.2,953_GEN_PACK-1.182577.1.184854.2
Kernel version 3.18.120-perf-g783cd9f#1 Mon Jan 14 16:08:26 WIB 2019
Build number PKQ1.180917.001.10.0.3.0.PDLMIXM
Very annoying!
Previously on Oreo doesn't have this issue!
Click to expand...
Click to collapse
That's bad to hear
I hoped that the january update would fix this bug.
I think, I will remain on Oreo till they fix it

Noticed a number of Bluetooth bugs logged with Google regarding Pie.
https://issuetracker.google.com/issues?q=bluetooth
Someone raised the A2 Lite issue, but it was rejected, saying it was up to xiaomi to sort.
https://issuetracker.google.com/issues/122369751
Just wondering if it could be a hardware issue, e.g. wifi and bluetooth using same frequency on same ariel and interrupting each other?
They (google) do seem to have assigned the SBC codec issue for investigation so that is positive.
https://issuetracker.google.com/issues/123179438

Had the same problem and went back to oreo.
Now everything works fine.

Ive repacked the aptx module in magisk, and bluetooth works loads better. i do get the odd jump where the equalizer switches on and off due to system optimizing, apart from that, all good. If anyone want to try heres link to the repack, with thanks to those who made the previous modules. https://1drv.ms/u/s!AqlJY73bUA7rholXS82XCuculBPhag . Use at own risk. Also, im not responsible for the link name lol.

boe323 said:
Ive repacked the aptx module in magisk, and bluetooth works loads better. i do get the odd jump where the equalizer switches on and off due to system optimizing, apart from that, all good. If anyone want to try heres link to the repack, with thanks to those who made the previous modules. https://1drv.ms/u/s!AqlJY73bUA7rholXS82XCuculBPhag . Use at own risk. Also, im not responsible for the link name lol.
Click to expand...
Click to collapse
How do you install und uninstall it? I've got breakups all the time when playing music from my a2 lite to the car stereo via bluetooth. Will using this codec fix the issue?

luno said:
How do you install und uninstall it? I've got breakups all the time when playing music from my a2 lite to the car stereo via bluetooth. Will using this codec fix the issue?
Click to expand...
Click to collapse
You need magisk v18, goto modules and click the plus sign, navigate to where the module is located and click on module, magisk will install it. Im not sure if it will fix issue but i can tell you thats it performs better and less latency than sbc.

Anyone with January update who doesn't have this problem?

grish said:
Anyone with January update who doesn't have this problem?
Click to expand...
Click to collapse
After installing january 5 update, the problem persist at the same way.

I have noticed in some situations that audio stay OK. For example, while at work, in my desktop using BT audio w/my headset, everything is ok. But if someone pass nearby my place, audio start working bad until the person went far enough. I think other devices BT affects audio, or antother type of EM signals, like WiFi, maybe...
I wish i could turn off "always visible" option in my device to test it. But that option is missed in PIE

I have the same problem

Sound issue in type c earphone

a month ago i bought a type c earphone and it has a problem . when i use speacker and microphne at the same time speacker sound get lower (like in game when i turn on mic my in game sounds get lower) and i cant change my earphone now and searching for a internal solution.anyone know what can i do now?
earphonelextone g20 (type c)
(have rooted device)and v4a installed

V4a is buggy. Uninstall it and use stock Dolby in oos11

HueyT said:
V4a is buggy. Uninstall it and use stock Dolby in oos11
Click to expand...
Click to collapse
having low volume issue with that

cryz3n said:
having low volume issue with that
Click to expand...
Click to collapse
Try sound amplifier in "accessibility" section

Question Problem with low volume on headphones

Hello. I'm on Xiaomi.eu Custom ROM MIUI 14. I have a problem with low volume on bluetooth headphones and on the bluetooth radio in the car. I haven't tried a usb-c to jack adapter because I don't have one. The volume compared to Realme GT is diametrically low. I tried with Dolby Atmos off and on Poco F4 and Realme GT and the result is the same - the volume on Poco F4 is much lower. I don't know if it's a MIUI overlay problem. Region set to Poland because that's where I'm from. I've tried switching to US and India, but it doesn't work. I know it used to help. Is there any solution to this problem? Maybe some Magisk module, or changing the parameters manually in the file? Well, unless the authors of Miui.eu decide to increase the volume, it would be great.