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Maniphest T86971

Video Sequencer Missing Frames on Export (Likely Error Reading mp4)
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060 3GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-26 01:28, hash: rB758c2210ae9e

Short description of error
Sadly, I only notice this bug when using this video clip.

Crash Course Organic Chemistry 3.mp4118 MBDownload

Google Drive in case 120MB is too much. (https://drive.google.com/file/d/19T_ZKjH41n-6REbW-19kVpsJdDcBYJ6P/view?usp=sharing)
I tired cut down and SD versions, but there is something specific about how this video in particular is encoded that Blender can't deal with. Sorry about the file size.

Blender can't decode frames when scrubbing

Exact steps for others to reproduce the error

Video Sync problems.blend498 KBDownload

Scrub the video.

Related Objects

Event Timeline

NicRule (NicRule) created this task.Mar 26 2021, 9:31 PM
Germano Cavalcante (mano-wii) added projects: VFX & Video, Video Sequencer.Mar 31 2021, 6:00 PM
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).

Thanks for the report,
I managed to replicate the first time, but then the preview also changed to the render result, so I can't see any difference anymore.
The same result appears if I close and open the .blend file.
So I'm not sure if I could really replicate
It may be the same problem as described in T86361: Rendered video is missing frames that are on the playback timeline, but in this report it is easy to replicate.

Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Apr 1 2021, 7:16 AM
Richard Antalik (ISS) triaged this task as High priority.
Richard Antalik (ISS) changed the subtype of this task from "Report" to "Bug".
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Issue with bad render seems to be fixed by rB6c33d3d01b6237cbe854b1d6ca54ac9680bb0563

But there are still some issues that are present in older Blender versions as well.
I will have a look at this.

Setting to high priority even if remaining issues are not new, because I am dealing with similar issues at this time

Richard Antalik (ISS) updated the task description. (Show Details)Apr 1 2021, 7:18 AM
Richard Antalik (ISS) mentioned this in T86361: Rendered video is missing frames that are on the playback timeline.Apr 1 2021, 7:41 AM
Richard Antalik (ISS) added a comment.Apr 1 2021, 9:22 AM

Looked into this a bit and remaining issue seems to be same as T86361 but it is quite hard to analyze such big file so I will merge this report.

Richard Antalik (ISS) closed this task as a duplicate of T86361: Rendered video is missing frames that are on the playback timeline.Apr 1 2021, 9:22 AM
Richard Antalik (ISS) added a comment.Dec 15 2021, 5:28 AM

I was working on adding VFR support today, and this was actually issue like in T91405, not one I suggested.

In any case I just wanted to mention, that it is fixed, in case you need it.

NicRule (NicRule) added a comment.Dec 15 2021, 10:33 PM

Thanks. You guys are awesome!