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Scrubbing on Video Sequencer does not produce sound if scrbbing spans only a few frames #125011

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opened 2024-07-18 19:52:14 +02:00 by Raimon Guarro · 12 comments
Raimon Guarro commented 2024-07-18 19:52:14 +02:00
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System Information
Operating system: Linux-6.1.0-21-amd64-x86_64-with-glibc2.36 64 Bits, X11 UI
Graphics card: NVIDIA GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 535.183.01

Blender Version
Broken: version: 4.2.0, branch: blender-v4.2-release, commit date: 2024-07-16 06:20, hash: a51f293548ad
Worked: 4.1.1
Caused by 91eb50ec2f

Short description of error
Scrubbing audio files doesn't scrub at every frame, it looks it scrubs by chunks of audio.

Exact steps for others to reproduce the error

  1. Start Blender using a Video Editing Template
  2. In a Video Sequence Editor, put an mp3 or wav audio file. Shift+A > Sound
  3. Activate Scrubbing in the Playback settings from the Timeline Editor.
  4. Advance frames in time one by one using right keyboard arrow. Sound frames aren't reproduced. They are only reproduced if you keep pressed the arrow key, or if you scrub a large enough timespan using the mouse.
**System Information** Operating system: Linux-6.1.0-21-amd64-x86_64-with-glibc2.36 64 Bits, X11 UI Graphics card: NVIDIA GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 535.183.01 **Blender Version** Broken: version: 4.2.0, branch: blender-v4.2-release, commit date: 2024-07-16 06:20, hash: `a51f293548ad` Worked: 4.1.1 Caused by 91eb50ec2f **Short description of error** Scrubbing audio files doesn't scrub at every frame, it looks it scrubs by chunks of audio. **Exact steps for others to reproduce the error** 1. Start Blender using a Video Editing Template 2. In a Video Sequence Editor, put an mp3 or wav audio file. Shift+A > Sound 3. Activate Scrubbing in the Playback settings from the Timeline Editor. 4. Advance frames in time one by one using right keyboard arrow. Sound frames aren't reproduced. They are only reproduced if you keep pressed the arrow key, or if you scrub a large enough timespan using the mouse.
Raimon Guarro added the
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Pratik Borhade commented 2024-07-19 07:59:03 +02:00
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Hi, thanks for the report. Unable to confirm this in 4.2.
Can you check with factory defaults in case some preferences or add-on is involved here?: File > Defaults > Load Factory Settings

Hi, thanks for the report. Unable to confirm this in 4.2. Can you check with factory defaults in case some preferences or add-on is involved here?: `File > Defaults > Load Factory Settings`
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Raimon Guarro commented 2024-07-19 09:13:54 +02:00
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Hi, thanks for looking at it. Problem persists after Loading Factory Defaults. Checked also Sound settings in the preferences within these factory defaults loaded, and they are the same than in 4.1.1, last version working.

Just to make sure that the issue reported is properly clear, the problem appears when advancing frame by frame, one by one, using single strokes of the arrow keys, or moving the playhead with the mouse in really tiny time increments (like 2-5 frames, for example).

Hi, thanks for looking at it. Problem persists after Loading Factory Defaults. Checked also Sound settings in the preferences within these factory defaults loaded, and they are the same than in 4.1.1, last version working. Just to make sure that the issue reported is properly clear, the problem appears when advancing frame by frame, one by one, using single strokes of the arrow keys, or moving the playhead with the mouse in really tiny time increments (like 2-5 frames, for example).
Pratik Borhade commented 2024-07-19 10:54:57 +02:00
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Thanks, I'll reset the status. @ChengduLittleA can you reproduce this? 🤔

Thanks, I'll reset the status. @ChengduLittleA can you reproduce this? 🤔
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YimingWu commented 2024-07-22 03:07:34 +02:00
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I can confirm this on 4.2 c7bcd1137f , but on latest 4.3 it's good.

Also good on d31ff88af7 but it's pretty old. Setting high priority since it's broken within 4.2 branch.

Here I was testing using this royalty free file I downloaded from youtube audio lib (in case if it's a weird file issue).

@iss any changes in vse comes to mind?

I can confirm this on 4.2 c7bcd1137fec , but on latest 4.3 it's good. Also good on d31ff88af7ee but it's pretty old. Setting high priority since it's broken within 4.2 branch. Here I was testing using this royalty free file I downloaded from youtube audio lib (in case if it's a weird file issue). @iss any changes in vse comes to mind?
Sweet Math - Mini Vandals.mp3
4.0 MiB
YimingWu changed title from Error scrubbing on Video Sequencer to Scrubbing on Video Sequencer does not produce sound if scrbbing spans only a few frames 2024-07-22 03:13:01 +02:00
YimingWu commented 2024-07-22 08:31:01 +02:00
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Actually my local build works just fine all the way up to c7bcd1137f , so I'm not quite sure, it might not happen in debug.

Actually my local build works just fine all the way up to c7bcd1137f , so I'm not quite sure, it might not happen in debug.
Henry Gernhardt commented 2024-07-24 01:09:36 +02:00
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I'm having this occur on a fresh update to 4.2 via the official snap package. System is Xubuntu 23.10. Scrubbing audio is flaky when using PulseAudio, but is perfectly fine when using OpenAL.

I'm having this occur on a fresh update to 4.2 via the official snap package. System is Xubuntu 23.10. Scrubbing audio is flaky when using PulseAudio, but is perfectly fine when using OpenAL.
YimingWu commented 2024-07-24 06:17:28 +02:00
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Scrubbing audio is flaky when using PulseAudio, but is perfectly fine when using OpenAL.

Thanks for this piece of additional info! :D

Just went and double checked my configurations, indeed during my test and also in 4.3 my configs are all OpenAL, and the problematic build was using configuration with PulseAudio.

This may points to library internal issue. My limited experience with miniaudio with PulseAudio as backend is that it will indeed have "slow start", maybe it's expected to have a longer packet before it's able to output audio. Though linux has always been a bit problematic in generic audio support. I believe to mitigate the issue, using Jack backend would be the best for low latency but it will grab your sound card and other programs can't use it unless you specifically configure them in the patch bay and it's quite goofy for generic users.

> Scrubbing audio is flaky when using PulseAudio, but is perfectly fine when using OpenAL. Thanks for this piece of additional info! :D Just went and double checked my configurations, indeed during my test and also in 4.3 my configs are all OpenAL, and the problematic build was using configuration with PulseAudio. This may points to library internal issue. My limited experience with miniaudio with PulseAudio as backend is that it will indeed have "slow start", maybe it's expected to have a longer packet before it's able to output audio. Though linux has always been a bit problematic in generic audio support. I believe to mitigate the issue, using `Jack` backend would be the best for low latency but it will grab your sound card and other programs can't use it unless you specifically configure them in the patch bay and it's quite goofy for generic users.
YimingWu commented 2024-07-24 06:19:40 +02:00
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I think for now we can lower priority since switching backend can fix the issue

I think for now we can lower priority since switching backend can fix the issue
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 labels 2024-07-24 06:19:55 +02:00
Henry Gernhardt commented 2024-07-24 14:57:44 +02:00
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Unless using OpenAL breaks things, I'd recommend having Blender favor OpenAL to PulseAudio on startup, then—the fix isn't obvious to the average user. I only ran across it because I had to use a similar fix on 2.93 (bug #89264).

Unless using OpenAL breaks things, I'd recommend having Blender favor OpenAL to PulseAudio on startup, then—the fix isn't obvious to the average user. I only ran across it because I had to use a similar fix on 2.93 (bug #89264).
Richard Antalik commented 2024-07-29 23:35:41 +02:00
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Here scrubbing does not work at all.

I can narrow this down to between fae16e7454 and 09666e1498. Will try to bisect, 4.2 was a bit problematic to bisect from what I remember.

From logs 91eb50ec2f, looks relevant.

Here scrubbing does not work at all. I can narrow this down to between fae16e74547f and 09666e149871. Will try to bisect, 4.2 was a bit problematic to bisect from what I remember. From logs 91eb50ec2f436c026233f184a2dfc7141d6f3b44, looks relevant.
😕 1
Richard Antalik commented 2024-07-30 00:20:32 +02:00
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Indeed, this issue is caused by 91eb50ec2f. CC @neXyon

Indeed, this issue is caused by 91eb50ec2f. CC @neXyon
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Joerg Mueller commented 2024-08-03 11:24:05 +02:00
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Should be fixed. Please test and let me know in case the issue is still present!

Should be fixed. Please test and let me know in case the issue is still present!
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