Blackmagic Forum

Experiencing sudden repeatable audio loss from things as simple as moving a click a few seconds forward on the track. Other things seem to randomly trigger it. Audio works for a minute or so, then suddenly drops out. Waveform still shows audio, but it doesn't play or render. I even tried transcoding the audio to from the .mov into .wav in audacity, but I got the same results.

Same here

Please indicate Resolve version, operating system, and computer spec (including Audio IO and GPU with driver details). Include this information in your signature to assist troubleshooting.

Which page are you using? Edit Timeline or Fairlight environment?

What is the source format and codec? What are the Timeline settings?

I have same question. The only way just restart it.

Problem didn't exist until using Resolve 20 beta.

Resolve version 20b4
Operating System: Windows 11 Home 64-bit (10.0, Build 26100) (26100.ge_release.240331-1435)
computer spec (including Audio IO and GPU with driver details). Include this information in your signature to assist troubleshooting.

BIOS: 5602 (type: UEFI)
Processor: AMD Ryzen 5 3600XT 6-Core Processor (12 CPUs), ~3.8GHz
Memory: 32768MB RAM
Available OS Memory: 32706MB RAM
Page File: 19161MB used, 15592MB availabl
DirectX Version: DirectX 12
DirectX Database Version: 1.7.0
---------------
Display Devices
---------------
Card name: NVIDIA GeForce GTX 1660 SUPER
Manufacturer: NVIDIA
Chip type: NVIDIA GeForce GTX 1660 SUPER
DAC type: Integrated RAMDAC
Device Type: Full Device (POST)
Display Memory: 22318 MB
Dedicated Memory: 5966 MB
Shared Memory: 16352 MB


Which page are you using? Edit Timeline or Fairlight environment? Normally the edit page, but audio dropout also occurs in fairlight.

What is the source format and codec? .mov
What are the Timeline settings?
Timeline resolution: 1080 x 1920 HD (vertical video)

Processing resolution: 1080 x 1920
Use vertical resolution: Enabled (✓)
Pixel aspect ratio: Square
Timeline frame rate: 30 fps
Playback frame rate: 30 fps
Use drop frame timecode: Disabled
Enable interlace processing: Disabled
Align Clips to Frame Boundaries: Enabled (✓)


--------------------------------------------------------------------------------------------------
Audio IO in Resolve
Audio I/O Settings (DaVinci Resolve on Windows 11):

I/O Engine: System Audio

Playback Processing Buffer Size: Auto
Latency: 10.0 ms
Record Buffer Size: 5
Latency: 0.0 ms
Input Device: Microphone (HDA Webcam USB)
Output Device: Speakers (High Definition Audio Device)
Automatic Speaker Configuration: Enabled (✓)
Monitor System External Inputs:
External Monitor Source: None
Immersive Audio (All Disabled):
Enable Ambisonics: ☐
Enable Audio Vivid: ☐
Enable Auro-3D: ☐
Enable BS.2051: ☐
Enable Dolby Atmos: ☐
Enable MPEG-H Audio: ☐
Enable 22.2 Surround: ☐
Enable SMPTE ST 2098: ☐
Enable 360 Reality Audio: ☐

Computer Speaker format is 16bit 48000hz
Computer MIC is 2 channels 16 bit 48000hz

renzhezhu wrote:I have same question. The only way just restart it.

Restarting does sometimes work for me, but only temporarily.

Reynaud Venter wrote:Please indicate Resolve version, operating system, and computer spec (including Audio IO and GPU with driver details). Include this information in your signature to assist troubleshooting.

Which page are you using? Edit Timeline or Fairlight environment?

What is the source format and codec? What are the Timeline settings?

-----------------------------------------------
Reynaud - Please see answer above.

Thank you for the detail.

Does the source media audio rate match the Timeline rate? e.g. both 48k.

Does the source media frame rate match the Timeline rate? e.g. both 30fps.

Reynaud Venter wrote:Thank you for the detail.

Does the source media audio rate match the Timeline rate? e.g. both 48k.

Does the source media frame rate match the Timeline rate? e.g. both 30fps.

Initial Video Stream
Resolution: 1920 x 1080
Aspect ratio: 1.77778
Format: h264
Bitrate: 15711 kbps
Frames per second: 29.973501
Selected codec: h264

Initial Audio Stream
Format: aac
Bitrate: 168 kbps
Rate: 44100 Hz
Channels: 2
Selected codec: aac

Also experiencing this since the latest beta 4 update

also have this since b4, pretty unsable at the moment. rolling back to b3.

RothEdits wrote:also have this since b4, pretty unsable at the moment. rolling back to b3.

I had the same issues on b3. Hoped b4 would fix it.

Please try the updated beta 4 (build 48) and see if this fixes the issue.

Dwaine Maggart wrote:https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=221814#p1149367

I updated to build 48. Problem still occurs. Tried deleting render cache and restarting resolve. Problem went away for about a minute, then audio cut out again.

Whilst we await a solution...For those afflicted: you might try changing to another timeline and hit play. Then, change back and see if your audio returns. That's how I've been avoiding a restart. It sometimes lasts until I reach the end of a session.

Same issue with b4. Did not have the issue on b3, and was doing the exact same edit when I updated.

Updating to new build now, we'll see.

Dwaine Maggart wrote:https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=221814#p1149367

has this audio bug been resolved? no pun intended.


ALL my timelines played normal last time I worked on this project. now, some do, some do not allow me to hear anything. same Mac, same everything. just a different day.

the copy and paste to new project "fix" does not work anymore, at least not with all timelines. so far one copy paste fixed it and the second did not. sound meters are blasting away, it's there.

experiment: new project, check settings for audio, which is system in/out, headphones out.
correct frame size and rate.

I paste the effected timeline. No sound

I create a new timeline using the Master uncut UHD file that the bad timeline was cut from.
it HAS sound.

pure twilight zone stuff.

dalars wrote:

Dwaine Maggart wrote:https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=221814#p1149367

has this audio bug been resolved? no pun intended.


ALL my timelines played normal last time I worked on this project. now, some do, some do not allow me to hear anything. same Mac, same everything. just a different day.

the copy and paste to new project "fix" does not work anymore, at least not with all timelines. so far one copy paste fixed it and the second did not. sound meters are blasting away, it's there.

experiment: new project, check settings for audio, which is system in/out, headphones out.
correct frame size and rate.

I paste the effected timeline. No sound

I create a new timeline using the Master uncut UHD file that the bad timeline was cut from.
it HAS sound.

pure twilight zone stuff.

Problem still occurring on my end. I finally went back to v19 because the persistent audio dropouts rendered the software useless.

sleightahand wrote:
Problem still occurring on my end. I finally went back to v19 because the persistent audio dropouts rendered the software useless.

this is occurring for me IN v19

dalars wrote:

sleightahand wrote:
Problem still occurring on my end. I finally went back to v19 because the persistent audio dropouts rendered the software useless.

this is occurring for me IN v19

Oh, that's odd. I have no issues in v19. You may have a separate issue; I'd recommend starting your own topic and describing your specific specs and issue in detail.

sleightahand wrote:Problem still occurring on my end.

Could you include a link to logs please? Are you able to provide timestamps of when this issue occurs?

Are you able to record a few seconds of audio to illustrate the type and duration of the dropouts?

I had this too, I can't remember whether it was my PC or Mac; what briefly fixed it for me was swapping to another timeline and back again when it occurred.

I've also had things in the not render in the fusion media out preview. If I click the left dot to put the same media out on the left pane the whole view is visible. Turn the right hand dot off and on again, that's fixed. So there's a few little janky pieces - but it is only Beta 4 to be completely fair.

Reynaud Venter wrote:

sleightahand wrote:Problem still occurring on my end.

Could you include a link to logs please? Are you able to provide timestamps of when this issue occurs?

Are you able to record a few seconds of audio to illustrate the type and duration of the dropouts?

Unfortunately, I had things that needed to be edited, so I gave up on fixing it and went back to v19. I'll try again after more of the bugs have been worked out.