Video Editing: Preview window shows the wrong frame #48439

New Issue

forceengine · 2016-05-15T17:15:35+02:00

forceengine commented

2016-05-15 17:15:35 +02:00

System Information
OS: Win 7, 64 bit

Blender Version
Broken: 2.77a Hash: abf6f08

Short description of error
I'm using blender to soft-cut (K) an existing video ( Size: 1920x1080, Container: mp4, Codec: H.264, FPS: 25, Format: Planar 4:2:0 YUV) into it's scenes.
When the curso is over a frame where you want to make a cut, because the scene changes it not the frame the change really is in. Instead it's one frame prior. The cursor shows the switch one frame too late (in both directions).
So if the scene changes in eg frame 15, the preview window will not show that until you reached frame 16. When you go back and check again, the scene will not change until frame 14. If you cut it on frame 15 then blender shows the correct change.
Sometimes this behaviour resets after a cut or if you position or the cursor with your mouse, but it does show up again.

The video is a random video downloaded from YouTube. The bug showed up with two seperate videos.

**System Information** OS: Win 7, 64 bit **Blender Version** Broken: 2.77a Hash: abf6f08 **Short description of error** I'm using blender to soft-cut (K) an existing video ( Size: 1920x1080, Container: mp4, Codec: H.264, FPS: 25, Format: Planar 4:2:0 YUV) into it's scenes. When the curso is over a frame where you want to make a cut, because the scene changes it not the frame the change really is in. Instead it's one frame prior. The cursor shows the switch one frame too late (in both directions). So if the scene changes in eg frame 15, the preview window will not show that until you reached frame 16. When you go back and check again, the scene will not change until frame 14. If you cut it on frame 15 then blender shows the correct change. Sometimes this behaviour resets after a cut or if you position or the cursor with your mouse, but it does show up again. The video is a random video downloaded from YouTube. The bug showed up with two seperate videos.

forceengine commented

2016-05-15 17:15:35 +02:00

Changed status to: 'Open'

forceengine commented

2016-05-15 17:15:35 +02:00

Added subscriber: @forceengine

Campbell Barton commented

2016-05-16 13:48:40 +02:00

Added subscriber: @ideasman42

Campbell Barton commented

2016-05-16 13:48:40 +02:00

Please help us by creating a reproducible test case.

Does this happen with all videos?
Does this only happen with video strips?

Can you create a test-scene to redo the issue?

Please help us by creating a reproducible test case. - Does this happen with all videos? - Does this only happen with video strips? Can you create a test-scene to redo the issue?

forceengine commented

2016-05-20 18:53:59 +02:00

In #48439#374652, @ideasman42 wrote:
Please help us by creating a reproducible test case.

Does this happen with all videos?

Does this only happen with video strips?

Can you create a test-scene to redo the issue?

This happens to every video I tried so far. Eg:
I downloaded the most viewed video from YouTube. Then I opened blender, switched to the Video editor and then inserted the video.
After blender changed the fps to the video fps, I changed the render size to 100% and moved the cursor with the arrow keys on my keyboard. Once I see a cut in the video I go back so that I can cut the new scene into a new stripe. When I go back to check where the cut is I have to go one frame past the the actual change so blender displays the change.

It doesn't matter if I use the arrow keys or Alt + Mousewheel.

I used blender to cut videos, no animation or other rendering things.

> In #48439#374652, @ideasman42 wrote: > Please help us by creating a reproducible test case. > > - Does this happen with all videos? > - Does this only happen with video strips? > > Can you create a test-scene to redo the issue? This happens to every video I tried so far. Eg: I downloaded the most viewed video from YouTube. Then I opened blender, switched to the Video editor and then inserted the video. After blender changed the fps to the video fps, I changed the render size to 100% and moved the cursor with the arrow keys on my keyboard. Once I see a cut in the video I go back so that I can cut the new scene into a new stripe. When I go back to check where the cut is I have to go one frame past the the actual change so blender displays the change. It doesn't matter if I use the arrow keys or Alt + Mousewheel. I used blender to cut videos, no animation or other rendering things.

Bastien Montagne commented

2016-06-01 16:08:44 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2016-06-01 16:08:44 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2016-06-01 16:08:44 +02:00

Bastien Montagne self-assigned this 2016-06-01 16:08:44 +02:00

Bastien Montagne commented

2016-06-01 16:08:44 +02:00

Please generate/use timecodes (https:*www.blender.org/manual/editors/sequencer/strips/properties/proxy_timecode.html, https:*wiki.blender.org/index.php/User:Nazg-gul/ProxyAndTimecode), videos using advanced compressions like mp4 cannot be reliably edited without those.

If problems were to persist once you are using timecodes, then please report here with a minimal .blend file (and video file) demonstrating the issue.

Please generate/use timecodes (https:*www.blender.org/manual/editors/sequencer/strips/properties/proxy_timecode.html, https:*wiki.blender.org/index.php/User:Nazg-gul/ProxyAndTimecode), videos using advanced compressions like mp4 cannot be reliably edited without those. If problems were to persist once you are using timecodes, then please report here with a minimal .blend file (and video file) demonstrating the issue.

forceengine commented

2016-06-05 16:03:34 +02:00

In #48439#376673, @mont29 wrote:
Please generate/use timecodes (https:*www.blender.org/manual/editors/sequencer/strips/properties/proxy_timecode.html, https:*wiki.blender.org/index.php/User:Nazg-gul/ProxyAndTimecode), videos using advanced compressions like mp4 cannot be reliably edited without those.

If problems were to persist once you are using timecodes, then please report here with a minimal .blend file (and video file) demonstrating the issue.

I will have a look into that and edit this entry later on...

> In #48439#376673, @mont29 wrote: > Please generate/use timecodes (https:*www.blender.org/manual/editors/sequencer/strips/properties/proxy_timecode.html, https:*wiki.blender.org/index.php/User:Nazg-gul/ProxyAndTimecode), videos using advanced compressions like mp4 cannot be reliably edited without those. > > If problems were to persist once you are using timecodes, then please report here with a minimal .blend file (and video file) demonstrating the issue. I will have a look into that and edit this entry later on...

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Video Editing: Preview window shows the wrong frame #48439