Blender VSE 2.8 speed control doesn't match render #72683

New Issue

Rudy · 2019-12-25T04:38:21+01:00

Rudy commented

2019-12-25 04:38:21 +01:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.66

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: f1aa4d18d4
Worked: (optional)

Short description of error
Everything is fine, the video plays at half speed in areas that I want it to
But when I render it, it either cuts from one frame to the next, skipping everything in between
Or it just jumps ahead to a frame and freezes until it matches when it's supposed to be played

Exact steps for others to reproduce the error
I cut the movie clip so that I have a middle piece that I want to play slower (3 pieces in total)
Moved the right piece further to the right, to make room for the middle piece I was going to extend
Made a speed control effect for said middle piece
Extended middle piece so that it transitions to right piece smoothly
Tried with "Stretch to input strip length" Check and value at .5
Tried with "Stretch to input strip length" UnCheck
Tried with "Use as speed" checked
Tried with "Speed factor" at 1 and the modifying properties being "Multiply Speed" at .5 (so that the video would play at 1 x 0.5 (='s half-speed or .5))
(just to get this straight "Speed factor" option lets you choose the speed you want the frames to played, but then "Multiply speed" lets you change it even further.
Is this for those that don't know 5x20 so they can just put 5 for Speed factor and 20 for Multiply speed, instead of just 100 in Speed factor??)
Tried with "Multiply Speed" at 0 and the modifying properties being "Speed Factor" (so .5 again)

I can't stress the fact that everything plays perfectly in the Video Sequencer, the strips that I want are playing at half speed
But when rendered it just freezes, jumps 2 the end of the strips, or spazzes out instead of just playing slower like in the VSE

Part 3.11_000218149-219749.mp4

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.66 **Blender Version** Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: `f1aa4d18d4` Worked: (optional) **Short description of error** Everything is fine, the video plays at half speed in areas that I want it to But when I render it, it either cuts from one frame to the next, skipping everything in between Or it just jumps ahead to a frame and freezes until it matches when it's supposed to be played **Exact steps for others to reproduce the error** I cut the movie clip so that I have a middle piece that I want to play slower (3 pieces in total) Moved the right piece further to the right, to make room for the middle piece I was going to extend Made a speed control effect for said middle piece Extended middle piece so that it transitions to right piece smoothly Tried with "Stretch to input strip length" Check and value at .5 Tried with "Stretch to input strip length" UnCheck Tried with "Use as speed" checked Tried with "Speed factor" at 1 and the modifying properties being "Multiply Speed" at .5 (so that the video would play at 1 x 0.5 (='s half-speed or .5)) (just to get this straight "Speed factor" option lets you choose the speed you want the frames to played, but then "Multiply speed" lets you change it even further. Is this for those that don't know 5x20 so they can just put 5 for Speed factor and 20 for Multiply speed, instead of just 100 in Speed factor??) Tried with "Multiply Speed" at 0 and the modifying properties being "Speed Factor" (so .5 again) I can't stress the fact that everything plays perfectly in the Video Sequencer, the strips that I want are playing at half speed But when rendered it just freezes, jumps 2 the end of the strips, or spazzes out instead of just playing slower like in the VSE [Part 3.11_000218149-219749.mp4](https://archive.blender.org/developer/F8243207/Part_3.11_000218149-219749.mp4)

Rudy commented

2019-12-25 04:38:21 +01:00

Added subscriber: @RudyTheNinja

blender-admin commented

2019-12-25 04:38:21 +01:00

#72242 was marked as duplicate of this issue

Richard Antalik commented

2020-01-01 04:18:15 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-01-01 04:18:15 +01:00

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

Richard Antalik commented

2020-01-01 04:18:15 +01:00

@RudyTheNinja I can not reproduce the issue.

The file you provided seems to be broken. Can you retry with different file?

@RudyTheNinja I can not reproduce the issue. The file you provided seems to be broken. Can you retry with different file?

Rudy commented

2020-01-02 00:07:52 +01:00

In #72683#840602, @iss wrote:
@RudyTheNinja I can not reproduce the issue.

The file you provided seems to be broken. Can you retry with different file?

The file I provided is a video, and it works just fine
I've refreshed this page multiple times and have accessed it on my phone as well

> In #72683#840602, @iss wrote: > @RudyTheNinja I can not reproduce the issue. > > The file you provided seems to be broken. Can you retry with different file? The file I provided is a video, and it works just fine I've refreshed this page multiple times and have accessed it on my phone as well

Richard Antalik commented

2020-01-02 00:18:26 +01:00

That video file visibly glitches on my PC at 0:20 sec mark and VLC player hangs just a few seconds in.
I have a reasonable conviction, that the file is broken, that's why I want you to try this with different file.

That video file visibly glitches on my PC at 0:20 sec mark and VLC player hangs just a few seconds in. I have a reasonable conviction, that the file is broken, that's why I want you to try this with different file.

Rudy commented

2020-01-02 00:22:59 +01:00

In #72683#840848, @iss wrote:
That video file visibly glitches on my PC at 0:20 sec mark and VLC player hangs just a few seconds in.
I have a reasonable conviction, that the file is broken, that's why I want you to try this with different file.

LMAO the file isn't broken 😂😂😂😂
That's how it's rendered, please read my issue (or at least the last 2 lines xD)

To further clarify, that IS my issue x'D

> In #72683#840848, @iss wrote: > That video file visibly glitches on my PC at 0:20 sec mark and VLC player hangs just a few seconds in. > I have a reasonable conviction, that the file is broken, that's why I want you to try this with different file. LMAO the file isn't broken 😂😂😂😂 That's how it's rendered, please read my issue (or at least the last 2 lines xD) To further clarify, that IS my issue x'D

Rudy commented

2020-01-02 00:28:20 +01:00

My issue is that what I see in the VSE doesnt match what I get when I render (read title of this bug report if you would)

https://blender.stackexchange.com/questions/161805/blender-vse-2-81a-speed-control-doesnt-match-up-with-render
Heres a little more detail on the fact that it plays normally in VSE but not in render
The video that's uploaded here is an isolated part of a whole

I feel I shouldn't have to say this but yes, I have rendered out other videos, completely different video files as well and they render out just fine

My issue is that what I see in the VSE doesnt match what I get when I render (read title of this bug report if you would) ``` ``` https://blender.stackexchange.com/questions/161805/blender-vse-2-81a-speed-control-doesnt-match-up-with-render Heres a little more detail on the fact that it plays normally in VSE but not in render The video that's uploaded here is an isolated part of a whole I feel I shouldn't have to say this but yes, I have rendered out other videos, completely different video files as well and they render out just fine

Eitan Traurig commented

2020-01-02 00:40:11 +01:00

Added subscriber: @EitanSomething

Eitan Traurig commented

2020-01-02 00:40:11 +01:00

In #72683#840849, @RudyTheNinja wrote:

In #72683#840848, @iss wrote:
That video file visibly glitches on my PC at 0:20 sec mark and VLC player hangs just a few seconds in.
I have a reasonable conviction, that the file is broken, that's why I want you to try this with different file.

LMAO the file isn't broken 😂😂😂😂
That's how it's rendered, please read my issue (or at least the last 2 lines xD)

To further clarify, that IS my issue x'D

What @iss is saying is that this specific could be corrupted which could be the problem and he wants to confirm if this is the problem by testing it with a different file.

> In #72683#840849, @RudyTheNinja wrote: >> In #72683#840848, @iss wrote: >> That video file visibly glitches on my PC at 0:20 sec mark and VLC player hangs just a few seconds in. >> I have a reasonable conviction, that the file is broken, that's why I want you to try this with different file. > > LMAO the file isn't broken 😂😂😂😂 > That's how it's rendered, please read my issue (or at least the last 2 lines xD) > > To further clarify, that IS my issue x'D What @iss is saying is that this specific could be corrupted which could be the problem and he wants to confirm if this is the problem by testing it with a different file.

Richard Antalik commented

2020-01-02 01:00:03 +01:00

@RudyTheNinja Ok I understand now.

I have tried steps you described with my own file, and I couldn't reproduce this anyway.

can you send a simple blend file you used?

@RudyTheNinja Ok I understand now. I have tried steps you described with my own file, and I couldn't reproduce this anyway. can you send a simple blend file you used?

Rudy commented

2020-01-03 11:22:41 +01:00

@iss
Sry it took a while, didn't have a .blend file with just that clip and its edits on hand
Send files.blend

@iss Sry it took a while, didn't have a .blend file with just that clip and its edits on hand [Send files.blend](https://archive.blender.org/developer/F8257992/Send_files.blend)

Rudy commented

2020-01-03 11:31:50 +01:00

Added subscriber: @richard-27

Rudy commented

2020-01-03 11:31:50 +01:00

@EitanSomething

What @richard-27 Antalik (ISS) is saying is that this specific could be corrupted which could be the problem and he wants to confirm if this is the problem by testing it with a different file.

The file in question is an mp4 file, and I have rendered more than one, they appear the same so it's not broken

Furthermore, I opened up a new .blend project and have rendered a different video/movie-file with the same edits and no problems

Lastly just to make sure I'm doing everything possible on my end to troubleshoot, the clip I provided is jst a very small portion of a whole
I've rendered out random areas of the whole video itself and its all perfectly fine, so the .blend file can't be it either

@EitanSomething > What @richard-27 Antalik (ISS) is saying is that this specific could be corrupted which could be the problem and he wants to confirm if this is the problem by testing it with a different file. The file in question is an mp4 file, and I have rendered more than one, they appear the same so it's not broken Furthermore, I opened up a new .blend project and have rendered a different video/movie-file with the same edits and no problems Lastly just to make sure I'm doing everything possible on my end to troubleshoot, the clip I provided is jst a very small portion of a whole I've rendered out random areas of the whole video itself and its all perfectly fine, so the .blend file can't be it either

Richard Antalik commented

2020-01-06 16:41:17 +01:00

In #72683#841564, @RudyTheNinja wrote:
Furthermore, I opened up a new .blend project and have rendered a different video/movie-file with the same edits and no problems

So this bug doesn't happen every time?

I used your blend file, I had to render new ~3h video with content on right place for this, then I rendered that file and I didn't experience such bad glitching, only where strips are cut, which is to be expected if strips are not perfectly aligned.

I may add, that when I want strips to be perfectly aligned, I cut them in normal speed and then add speed control effect and depending on what speed value I set, I divide length of strip by that value.

So if orig strip has length of 1234, I want speed of 0.35
I edit strip length and type in 1234/0.35
the result is then perfectly aligned. Changing these values is a bit worse though.

In any case I am doing what I can to reproduce this, but I am not able to do so.
Is it possible that this problem could be caused by something different than speed control strip? Perhaps some animated property is "misbehaving"?

> In #72683#841564, @RudyTheNinja wrote: > Furthermore, I opened up a new .blend project and have rendered a different video/movie-file with the same edits and no problems So this bug doesn't happen every time? I used your blend file, I had to render new ~3h video with content on right place for this, then I rendered that file and I didn't experience such bad glitching, only where strips are cut, which is to be expected if strips are not perfectly aligned. I may add, that when I want strips to be perfectly aligned, I cut them in normal speed and then add speed control effect and depending on what speed value I set, I divide length of strip by that value. So if orig strip has length of 1234, I want speed of 0.35 I edit strip length and type in 1234/0.35 the result is then perfectly aligned. Changing these values is a bit worse though. In any case I am doing what I can to reproduce this, but I am not able to do so. Is it possible that this problem could be caused by something different than speed control strip? Perhaps some animated property is "misbehaving"?

Rudy commented

2020-01-08 08:50:50 +01:00

It should only have a few seconds of video, so idk how u ended up rendering out 3h worth of it
I, of course, deleted anything before and after the area that's glitching out. The video is originally longer but its at this spot where it glitches out

I don't understand that part where you expect it in areas that aren't aligned
What do you mean by aligned?
1 The speed control option with the strip?
2 The cuts in the strip?
3 Their positions in the VSE?

1 I cut the strip before placing the speed effect
2 I use CTRL while grabbing the strip for it to attach to the one before with no gaps in between
3 they're all the way to the right because I didn't bother to move them to frame position 1 on VSE after deleting anything before and after

The part where you say u had to render 3h worth throws me off
Does it still give you the full video even after I deleted it and then saved?
I'm opening the .blend file I sent rn and it should only contain a few seconds of footage with the edits I added to it

It should only have a few seconds of video, so idk how u ended up rendering out 3h worth of it I, of course, deleted anything before and after the area that's glitching out. The video is originally longer but its at this spot where it glitches out I don't understand that part where you expect it in areas that aren't aligned What do you mean by aligned? 1 The speed control option with the strip? 2 The cuts in the strip? 3 Their positions in the VSE? 1 I cut the strip before placing the speed effect 2 I use CTRL while grabbing the strip for it to attach to the one before with no gaps in between 3 they're all the way to the right because I didn't bother to move them to frame position 1 on VSE after deleting anything before and after The part where you say u had to render 3h worth throws me off Does it still give you the full video even after I deleted it and then saved? I'm opening the .blend file I sent rn and it should only contain a few seconds of footage with the edits I added to it

Richard Antalik commented

2020-01-08 10:44:44 +01:00

In #72683#843817, @RudyTheNinja wrote:
It should only have a few seconds of video, so idk how u ended up rendering out 3h worth of it
I, of course, deleted anything before and after the area that's glitching out. The video is originally longer but its at this spot where it glitches out

I had to re-create original video with content at the right place. It mean too much, just saying that such effort is necessary to try to reproduce as fairly as possible.

I don't understand that part where you expect it in areas that aren't aligned
What do you mean by aligned?
1 The speed control option with the strip?
2 The cuts in the strip?
3 Their positions in the VSE?

I mean cuts in strip, video from camera may "jump" a little bit because of this misalignment. This may be caused if you change length by hand.
So I ignore these jumps.

I wasn't able to recreate effect at 0:20 in video you posted.

Here is my render (I screwed biginning a bit, but that's besides the point)
Part 3.1_000218211-219799.mp4

I would ask - if you open .blend file you provided and render it once again, is result still bad?

> In #72683#843817, @RudyTheNinja wrote: > It should only have a few seconds of video, so idk how u ended up rendering out 3h worth of it > I, of course, deleted anything before and after the area that's glitching out. The video is originally longer but its at this spot where it glitches out I had to re-create original video with content at the right place. It mean too much, just saying that such effort is necessary to try to reproduce as fairly as possible. > I don't understand that part where you expect it in areas that aren't aligned > What do you mean by aligned? > 1 The speed control option with the strip? > 2 The cuts in the strip? > 3 Their positions in the VSE? I mean cuts in strip, video from camera may "jump" a little bit because of this misalignment. This may be caused if you change length by hand. So I ignore these jumps. I wasn't able to recreate effect at 0:20 in video you posted. Here is my render (I screwed biginning a bit, but that's besides the point) [Part 3.1_000218211-219799.mp4](https://archive.blender.org/developer/F8265806/Part_3.1_000218211-219799.mp4) I would ask - if you open .blend file you provided and render it once again, is result still bad?

Rudy commented

2020-01-09 10:18:59 +01:00

I went ahead and rerendered it, it still glitches out
snd_000218211-219799.mp4

I also went ahead and recorded my screen to show how it's perfectly fine on VSE
Only hiccups are in between strips but that's smoothed over after its cached (as you can see, I rollback the video and the hiccups are gone)
I've rendered out many projects going off of what I see in VSE and it comes out just fine
2020-01-09_00-59-35.mp4

And you already have the settings for each strip from my .blend file I uploaded, they are still unchanged

As you can see there's no freezing, glitching when playing it through VSE
All my other videos render out just fine if not identical to what I see in VSE
I've already restarted this project 3 times to new .blend project files as I've already mentioned on this thread as well as used a completely different video file

I went ahead and rerendered it, it still glitches out [snd_000218211-219799.mp4](https://archive.blender.org/developer/F8267164/snd_000218211-219799.mp4) I also went ahead and recorded my screen to show how it's perfectly fine on VSE Only hiccups are in between strips but that's smoothed over after its cached (as you can see, I rollback the video and the hiccups are gone) I've rendered out many projects going off of what I see in VSE and it comes out just fine [2020-01-09_00-59-35.mp4](https://archive.blender.org/developer/F8267212/2020-01-09_00-59-35.mp4) And you already have the settings for each strip from my .blend file I uploaded, they are still unchanged ``` ``` As you can see there's no freezing, glitching when playing it through VSE All my other videos render out just fine if not identical to what I see in VSE I've already restarted this project 3 times to new .blend project files as I've already mentioned on this thread as well as used a completely different video file

Richard Antalik commented

2020-01-09 11:35:48 +01:00

Can you upload whole d:\Editing\Videos\Projects\DeltaRune\Deltarune.mp4 file somewhere to google drive?

I can suggest some fuzzing around, first updating to 2.81a version, then to change output codec. This doesn't look to be VSE bug to me. It still could be some weird issue in source file, but unless I have it I can't tell (you can run blender with --debug-ffmpeg argument from command line and send us output, but I am not sure if it will tell anything useful).

Can you upload whole `d:\Editing\Videos\Projects\DeltaRune\Deltarune.mp4` file somewhere to google drive? I can suggest some fuzzing around, first updating to 2.81a version, then to change output codec. This doesn't look to be VSE bug to me. It still could be some weird issue in source file, but unless I have it I can't tell (you can run blender with --debug-ffmpeg argument from command line and send us output, but I am not sure if it will tell anything useful).

Rudy commented

2020-01-10 02:26:17 +01:00

I've moved on from this project a good while ago
I rendered out a few and chose the best one out of all of them and just went with that
The rest is ancient history

I am using latest 2.81a version, which had me redo the project all over again bcuz it would move the strips, settings, and effects out of sync when I opened .blend file

I've moved on from this project a good while ago I rendered out a few and chose the best one out of all of them and just went with that The rest is ancient history I am using latest 2.81a version, which had me redo the project all over again bcuz it would move the strips, settings, and effects out of sync when I opened .blend file

Richard Antalik commented

2020-01-17 00:17:46 +01:00

Added subscribers: @JacquesLucke, @lichtwerk, @MaciejJutrzenka