Playback of pitch-changed audio improperly timed for arbitrary seek #72211

New Issue

Wilbur Jaywright · 2019-12-06T00:44:12+01:00

Wilbur Jaywright commented

2019-12-06 00:44:12 +01:00

System Information
Operating system: Windows 10, 64 bit
Graphics card: Intel HD graphics

Blender Version
Broken: 2.81

Short description of error
Using pitch change on audio strip then playing at an arbitrary location causes it to play from that location as if the audio before it had been at normal speed.

Exact steps for others to reproduce the error
Open a video editing file.
Import a music strip onto the sequencer.
Adjust the endpoint frame so as to allow for the whole file's playback.
Move the playhead to a point in the middle of the song.
Play so as to get an idea of where that point is.
Stop playback.
Change the pitch of the audio strip to 1.5, or some higher than 1 value.
Move the playhead back to the same mid-song position as before.
Play. The audio will play faster, but will start at the same place as it did when it was at the normal speed.

**System Information** Operating system: Windows 10, 64 bit Graphics card: Intel HD graphics **Blender Version** Broken: 2.81 **Short description of error** Using pitch change on audio strip then playing at an arbitrary location causes it to play from that location *as if the audio before it had been at normal speed.* **Exact steps for others to reproduce the error** Open a video editing file. Import a music strip onto the sequencer. Adjust the endpoint frame so as to allow for the whole file's playback. Move the playhead to a point in the middle of the song. Play so as to get an idea of where that point is. Stop playback. Change the pitch of the audio strip to 1.5, or some higher than 1 value. Move the playhead back to the same mid-song position as before. Play. The audio will play faster, but will start at the same place as it did when it was at the normal speed.

Wilbur Jaywright commented

2019-12-06 00:44:12 +01:00

Added subscriber: @zargul

Germano Cavalcante commented

2019-12-09 15:17:22 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2019-12-09 15:17:22 +01:00

Could you provide a simple blend file demonstrating the problem?

Wilbur Jaywright commented

2019-12-10 16:17:35 +01:00

Sure, here's one. speed_problem_281.blend

Note the music is possibly copyrighted by whoever manufactured the singing fish it came from.

Sure, here's one. [speed_problem_281.blend](https://archive.blender.org/developer/F8205655/speed_problem_281.blend) Note the music is possibly copyrighted by whoever manufactured the singing fish it came from.

Troy Sobotka commented

2019-12-20 19:46:36 +01:00

Added subscribers: @neXyon, @troy_s

Troy Sobotka commented

2019-12-20 19:46:36 +01:00

@neXyon Thoughts?

Joerg Mueller commented

2019-12-21 21:23:30 +01:00

Changed status from 'Open' to: 'Archived'

Joerg Mueller closed this issue

2019-12-21 21:23:30 +01:00

Joerg Mueller self-assigned this 2019-12-21 21:23:30 +01:00

Joerg Mueller commented

2019-12-21 21:23:30 +01:00

This is a known issue and a limitation of how pitch animation works and has been there since Blender had pitch animation, even before my time (i.e. 2.49 and earlier). Unfortunately, this is a really hard problem and not easily solved, it would need a completely different architecture of the audio system which doesn't fit well with Blender's animation system. I've written about this elsewhere a couple of times already.

TLDR: known issue, pretty much can't do anything about it, when you use this feature, you have to always start playing from the beginning of the pitch animation.

This is a known issue and a limitation of how pitch animation works and has been there since Blender had pitch animation, even before my time (i.e. 2.49 and earlier). Unfortunately, this is a really hard problem and not easily solved, it would need a completely different architecture of the audio system which doesn't fit well with Blender's animation system. I've written about this elsewhere a couple of times already. TLDR: known issue, pretty much can't do anything about it, when you use this feature, you have to always start playing from the beginning of the pitch animation.

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Playback of pitch-changed audio improperly timed for arbitrary seek #72211