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VSE unable to display contents of some .mkv files. #108883

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opened 2023-06-12 12:11:35 +02:00 by Juraj Mucha · 9 comments
Juraj Mucha commented 2023-06-12 12:11:35 +02:00
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System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94

Blender Version
Broken: version: 3.3.6, branch: master, commit date: 2023-04-17 14:03, hash: 948f8298b982
Worked: 3.5.1-4.0 (tested with those two shared mkv files below)

Short description of error
Some video strip in VSE won't load video content.
Videos are in mkv format and play correctly in VLC player.
Converting these videos to mp4 fixes the problem.
Upon drag and dropping the same videos on VSE timeline they display only one frame for some reason.

Exact steps for others to reproduce the error
this is a link to a shared google drive folder.
In it is a demo blender file with first VSE movie strip being problematic and the other one is working.
In that same folder are also mkv video files referenced by VSE.
https://drive.google.com/drive/folders/1_eewHTMO4Kvn7dTIxCOCZrO6MAxuWsbr?usp=drive_link

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94 **Blender Version** Broken: version: 3.3.6, branch: master, commit date: 2023-04-17 14:03, hash: `948f8298b982` Worked: 3.5.1-4.0 (tested with those two shared mkv files below) **Short description of error** Some video strip in VSE won't load video content. Videos are in mkv format and play correctly in VLC player. Converting these videos to mp4 fixes the problem. Upon drag and dropping the same videos on VSE timeline they display only one frame for some reason. **Exact steps for others to reproduce the error** this is a link to a shared google drive folder. In it is a demo blender file with first VSE movie strip being problematic and the other one is working. In that same folder are also mkv video files referenced by VSE. https://drive.google.com/drive/folders/1_eewHTMO4Kvn7dTIxCOCZrO6MAxuWsbr?usp=drive_link
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YimingWu commented 2023-06-12 15:35:32 +02:00
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Can't replicate the issue from ffprobe seems to give reasonable output for video stream.

Tried 3.5.1-4.0. @Georgefly Could you try using a newer version of blender?

Input #0, matroska,webm, from 'Sh0830_00099-00257.mkv':
  Metadata:
    SCENE           : Scene
    FILE            : D:\škola\2022 - 2023 (4r, 2. mgr r.)\mgr_animatic.blend
    NOTE            : Shot: Sh0830  *** Playblast Start Time: 3D: 40, Edit: 0
    DATE            : 2022/11/16 02:13:39
    ENCODER         : Lavf59.16.100
  Duration: 00:00:06.63, start: 0.000000, bitrate: 822 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc
    Metadata:
      DURATION        : 00:00:06.625000000
Can't replicate the issue from `ffprobe` seems to give reasonable output for video stream. Tried 3.5.1-4.0. @Georgefly Could you try using a newer version of blender? ``` Input #0, matroska,webm, from 'Sh0830_00099-00257.mkv': Metadata: SCENE : Scene FILE : D:\škola\2022 - 2023 (4r, 2. mgr r.)\mgr_animatic.blend NOTE : Shot: Sh0830 *** Playblast Start Time: 3D: 40, Edit: 0 DATE : 2022/11/16 02:13:39 ENCODER : Lavf59.16.100 Duration: 00:00:06.63, start: 0.000000, bitrate: 822 kb/s Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc Metadata: DURATION : 00:00:06.625000000 ```
Juraj Mucha commented 2023-06-12 15:48:04 +02:00
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I tried with both 3.5.1 just now (see screenshot attatched) and 4.0.0 Alpha as well both giving same faulty result.

I tried with both 3.5.1 just now (see screenshot attatched) and 4.0.0 Alpha as well both giving same faulty result.
Snímka obrazovky 2023-06-12 154519.png
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Snímka obrazovky 2023-06-12 154519.png
Evan Wilson commented 2023-06-13 01:32:58 +02:00
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Clicking on the file folder under Source in the sidebar, then clicking on the mkv file resets the ending offset to 0, allowing the movie to be displayed. Before, it appears that the end (-131) is set to be before the beginning(-1). I think this is simply a case of the offset being incorrectly set some how. @Georgefly any idea how they might have gotten that way?

Clicking on the file folder under Source in the sidebar, then clicking on the mkv file resets the ending offset to 0, allowing the movie to be displayed. Before, it appears that the end (-131) is set to be before the beginning(-1). I think this is simply a case of the offset being incorrectly set some how. @Georgefly any idea how they might have gotten that way?
108883_offsets.png
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108883_open.png
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108883_offsets.png 108883_open.png
YimingWu commented 2023-06-13 03:56:02 +02:00
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Negative strip length could be related to #107588

Negative strip length could be related to #107588
Juraj Mucha commented 2023-06-15 23:48:53 +02:00
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I can confirm that:

  1. loading source file from n panel in the .blend I aploaded for demo indeed resets the end values and allows for the content to appear, however I tried the same approach in the .blend file that this simplified demo originated form and it didn't reset.
  2. in the said original file, it seems all other "corrupted strips" have some negative offset start (always -1 ) and end (seems on random) and all the uncorrapted ones have these values at 0. Simply setting these values to 0 on corrupted ones does't solve the problem only shrinks the strip to length of 1 frame.

All the mkv files used in the original blend file were generated using Ubisoft Shot manager about a year ago and at roughly that time also loaded to VSE for editing. At that time all were displayed correctly. Now when I reopened the file, all strips were missing content due to change of a file name and therefore filepath. Using code generated by Chat GPT (visible in demo file) I changed filepaths of all the strips to correct ones but still for some of those this thing happened.

Sorry for a wall of text. I don't know how to shorten it and it all seems to me possibly important.

I can confirm that: 1. loading source file from n panel in the .blend I aploaded for demo indeed resets the end values and allows for the content to appear, however I tried the same approach in the .blend file that this simplified demo originated form and it didn't reset. 2. in the said original file, it seems all other "corrupted strips" have some negative offset start (always -1 ) and end (seems on random) and all the uncorrapted ones have these values at 0. Simply setting these values to 0 on corrupted ones does't solve the problem only shrinks the strip to length of 1 frame. All the mkv files used in the original blend file were generated using Ubisoft Shot manager about a year ago and at roughly that time also loaded to VSE for editing. At that time all were displayed correctly. Now when I reopened the file, all strips were missing content due to change of a file name and therefore filepath. Using code generated by Chat GPT (visible in demo file) I changed filepaths of all the strips to correct ones but still for some of those this thing happened. Sorry for a wall of text. I don't know how to shorten it and it all seems to me possibly important.
Evan Wilson commented 2023-06-23 12:18:25 +02:00
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In #103662 (comment) @iss says:

One thing that is odd is that in sample file seq->len is 1, which seems to produce incorrect end offset and strip ends up inverted. This can happen if filepath argument of new_sound() is not valid.

Glancing over the code I can't see how an incorrect filepath leads to inverted strip offsets, but both #103662 and this report have those two things in common.

In https://projects.blender.org/blender/blender/issues/103662#issuecomment-82046 @iss says: > One thing that is odd is that in sample file `seq->len` is 1, which seems to produce incorrect end offset and strip ends up inverted. This can happen if `filepath` argument of `new_sound()` is not valid. Glancing over the code I can't see how an incorrect filepath leads to inverted strip offsets, but both #103662 and this report have those two things in common.
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Richard Antalik commented 2023-07-05 01:13:46 +02:00
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I am not quite sure what is the issue here, but from comments it seems, that somehow file path got broken and when repaired with script, operation was not sucessful.
So I see 2 issues:

  • Filepaths got broken - Haven't heared about such issue, but I would need a way to replicate this. If you think this is a bug in Blender, please provide old file that works with old version and specify which version works.
  • Script not repairing path properly - I also would have to replicate this issue, so I would need instructions on how to setup paths and such to replicate what you did.

I see, that when I click on filepath property and press enter, the content appears, so I can investigate that.

As far as negative offsets go, these are normal. You can extend strip length beyond content length this way. Since content length was set to 1 it likely applied negative offset to not lose strip position.

I am not quite sure what is the issue here, but from comments it seems, that somehow file path got broken and when repaired with script, operation was not sucessful. So I see 2 issues: - Filepaths got broken - Haven't heared about such issue, but I would need a way to replicate this. If you think this is a bug in Blender, please provide old file that works with old version and specify which version works. - Script not repairing path properly - I also would have to replicate this issue, so I would need instructions on how to setup paths and such to replicate what you did. I see, that when I click on filepath property and press enter, the content appears, so I can investigate that. As far as negative offsets go, these are normal. You can extend strip length beyond content length this way. Since content length was set to 1 it likely applied negative offset to not lose strip position.
Richard Antalik commented 2023-07-05 01:35:20 +02:00
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As far as I can see, the only issue that prevents strip from being rendered is, that it doesn't have length defined, which happens when you set filepath. So I would need steps to reproduce that issue in order to fix the bug

As far as I can see, the only issue that prevents strip from being rendered is, that it doesn't have length defined, which happens when you set filepath. So I would need steps to reproduce that issue in order to fix the bug
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Juraj Mucha commented 2023-07-17 16:26:02 +02:00
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@iss
To my understanding the filepath got broken because I changed the name of a parent file higher in the file structure (see filepaths under).
This was the filepath in the original file if it helps :
D:+Škola+\2022 - 2023 (4r, 2. mgr r.)\playblasts\5 serious\all\Sh0800_00040-00169.mkv

This was the filepath before I used the script to change it on all the strips (onli difference was that "+" characters were missing)
D:\Škola\2022 - 2023 (4r, 2. mgr r.)\playblasts\5 serious\all\Sh0800_00040-00169.mkv

Unfortunatelly I'm not sure what would be the exact steps to reproduce this.
If I can help in any way, or any of you can somehow direct me on what to do to help, please let me know.

@iss To my understanding the filepath got broken because I changed the name of a parent file higher in the file structure (see filepaths under). This was the filepath in the original file if it helps : D:\+Škola+\2022 - 2023 (4r, 2. mgr r.)\playblasts\5 serious\all\Sh0800_00040-00169.mkv This was the filepath before I used the script to change it on all the strips (onli difference was that "+" characters were missing) D:\Škola\2022 - 2023 (4r, 2. mgr r.)\playblasts\5 serious\all\Sh0800_00040-00169.mkv Unfortunatelly I'm not sure what would be the exact steps to reproduce this. If I can help in any way, or any of you can somehow direct me on what to do to help, please let me know.
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