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VSE: AV-Sync causes caching to fail #58000

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opened 2018-11-22 15:11:23 +01:00 by Francesco Siddi · 7 comments
Francesco Siddi commented 2018-11-22 15:11:23 +01:00
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System Information
Ubuntu Linux, GTX 1080

Blender Version
Broken: Blender 2.8, 2.79b

Exact steps for others to reproduce the error
How to reproduce:

  • Load a clip in the VSE
  • Set playback method to AV-Sync
  • The sequence will not be cached and will not play at the target frame rate.

Setting playback to No Sync makes caching work.

**System Information** Ubuntu Linux, GTX 1080 **Blender Version** Broken: Blender 2.8, 2.79b **Exact steps for others to reproduce the error** How to reproduce: - Load a clip in the VSE - Set playback method to AV-Sync - The sequence will not be cached and will not play at the target frame rate. Setting playback to No Sync makes caching work.
Francesco Siddi commented 2018-11-22 15:11:23 +01:00
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Added subscriber: @fsiddi

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Francesco Siddi commented 2018-11-22 15:11:43 +01:00
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Added subscriber: @Hjalti

Added subscriber: @Hjalti
William Reynish commented 2018-11-22 15:16:47 +01:00
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William Reynish commented 2018-11-22 15:16:47 +01:00
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Physics caching also doesn't work with this option. It seems like caching in general doesn't work with AV Sync.

Physics caching also doesn't work with this option. It seems like caching in general doesn't work with AV Sync.
Richard Antalik commented 2019-02-23 23:09:09 +01:00
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Added subscriber: @iss

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Richard Antalik commented 2019-02-23 23:09:09 +01:00
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Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'
Richard Antalik self-assigned this 2019-02-23 23:09:09 +01:00
Richard Antalik commented 2019-02-23 23:09:09 +01:00
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I can not confirm this.

With A/V sync enabled, frames are skipped and therefore there are "holes" in the cache. You would have to play section several times to be fully cached.

D3934: VSE cache with frame prefetching (WIP) will make it easier to fill the cache in advance + actually see the cache.

This is not a bug.

Only way around this, is threaded significantly faster rendering and preview drawing.
Prefetching is threaded rendering, so it's just a partial solution.

I can not confirm this. With A/V sync enabled, frames are skipped and therefore there are "holes" in the cache. You would have to play section several times to be fully cached. [D3934: VSE cache with frame prefetching (WIP)](https://archive.blender.org/developer/D3934) will make it easier to fill the cache in advance + actually see the cache. This is not a bug. Only way around this, is threaded significantly faster rendering and preview drawing. Prefetching is threaded rendering, so it's just a partial solution.
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Reference: studio/blender-studio#58000
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