VSE playback only works backwards for .mov files #91201

Closed
opened 2021-09-05 23:10:46 +02:00 by Chris Hoppe · 7 comments

System Information
Operating system: Ubuntu 20.04.3 LTS
Graphics card: NVIDIA Corporation TU104GL [Quadro RTX 5000] (rev a1)

Blender Version
Broken: 2.93.4
Worked: n/a

Short description of error
When I load a .mov file into the VSE it plays back reasonably well when only when it is played backwards using the < button. It will not play forwards at all, but playback simply stops.

Exact steps for others to reproduce the error

  1. start blender
  2. File > New > Video Editing
  3. Add > Movie > select .mov file from the file system
  4. play it forwards (nothing happens)
  5. click on the timeline select a frame with a higher frame number
  6. play backwards

Format/ codec used: MOV/H.265 lpcm
compression Long GOP
4K
DSCF0100.MOV
faulty_playback.blend

Result: The movie file plays backwards (even without changing the cache size or setting proxy size manually - although that does help)

**System Information** Operating system: Ubuntu 20.04.3 LTS Graphics card: NVIDIA Corporation TU104GL [Quadro RTX 5000] (rev a1) **Blender Version** Broken: 2.93.4 Worked: n/a **Short description of error** When I load a .mov file into the VSE it plays back reasonably well when only when it is played backwards using the < button. It will not play forwards at all, but playback simply stops. **Exact steps for others to reproduce the error** 1. start blender 2. File > New > Video Editing 3. Add > Movie > select .mov file from the file system 4. play it forwards (nothing happens) 5. click on the timeline select a frame with a higher frame number 6. play backwards Format/ codec used: MOV/H.265 lpcm compression Long GOP 4K [DSCF0100.MOV](https://archive.blender.org/developer/F10379810/DSCF0100.MOV) [faulty_playback.blend](https://archive.blender.org/developer/F10379944/faulty_playback.blend) Result: The movie file plays backwards (even without changing the cache size or setting proxy size manually - although that does help)
Author

Added subscriber: @ChrisHoppe

Added subscriber: @ChrisHoppe
Member

Added subscriber: @lichtwerk

Added subscriber: @lichtwerk
Member

Changed status from 'Needs Triage' to: 'Needs User Info'

Changed status from 'Needs Triage' to: 'Needs User Info'
Member

Likely a duplicate of #89045 (VSE playback periodically refuses to work (Pulseaudio, OpenAL seems fine))

@ChrisHoppe : does it work if you set Preferences > System > Sound > Audio Device to something other than PulseAudio?
Could you also check if this is still an issue in a fresh 3.0 build from https://builder.blender.org/download/daily/?

Likely a duplicate of #89045 (VSE playback periodically refuses to work (Pulseaudio, OpenAL seems fine)) @ChrisHoppe : does it work if you set `Preferences` > `System` > `Sound` > `Audio Device` to something other than `PulseAudio`? Could you also check if this is still an issue in a fresh 3.0 build from https://builder.blender.org/download/daily/?
Author

Hi Philipp,
The problem persists on 3.0, but on both versions, it will works when I change the audio subsystem to "none".
Hope this helps.
Best regards,
Chris

Hi Philipp, The problem persists on 3.0, but on both versions, it will works when I change the audio subsystem to "none". Hope this helps. Best regards, Chris
Member

So sounds like this is really a duplicate of #89045 (VSE playback periodically refuses to work (Pulseaudio, OpenAL seems fine))
Good news, that has been fixed :)

Will merge into #89045, feel free to comment again if issues persist in a fresh 3.0 build from https://builder.blender.org/download/daily/

So sounds like this is really a duplicate of #89045 (VSE playback periodically refuses to work (Pulseaudio, OpenAL seems fine)) Good news, that has been fixed :) Will merge into #89045, feel free to comment again if issues persist in a fresh 3.0 build from https://builder.blender.org/download/daily/
Member

Closed as duplicate of #89045

Closed as duplicate of #89045
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Reference: blender/blender#91201
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