When downloading videos from Cobalt.tools (tested with YouTube and X), uploading the saved video to WhatsApp results in a black preview as the video cover.
• During upload, the preview appears correctly.
• After upload completes, the preview turns completely black, even though the video is fine, and the starting frame is not black.
This issue is consistently reproducible on iOS (tested with Safari on version 18.3).
reproduction steps
Go to Cobalt.tools.
2. Download a video from YouTube (e.g., save to Photos).
3. Upload the downloaded video to WhatsApp.
4. Notice the preview turns black after the upload finishes.
screenshots
links
platform information
Safari on iOS 18.3 iPhone 16 Pro
additional context
This issue has been observed mainly with YouTube videos downloaded via Cobalt.tools. I have also tested with X, and the same issue occurs. I’m not sure if it affects other platforms as I primarily use YouTube downloads.
Originally created by @Muatex on GitHub (Feb 2, 2025).
Original GitHub issue: https://github.com/imputnet/cobalt/issues/1086
### bug description
When downloading videos from Cobalt.tools (tested with YouTube and X), uploading the saved video to WhatsApp results in a black preview as the video cover.
• During upload, the preview appears correctly.
• After upload completes, the preview turns completely black, even though the video is fine, and the starting frame is not black.
This issue is consistently reproducible on iOS (tested with Safari on version 18.3).
### reproduction steps
1. Go to Cobalt.tools.
2. Download a video from YouTube (e.g., save to Photos).
3. Upload the downloaded video to WhatsApp.
4. Notice the preview turns black after the upload finishes.
### screenshots
### links
```shell
```
### platform information
Safari on iOS 18.3 iPhone 16 Pro
### additional context
This issue has been observed mainly with YouTube videos downloaded via Cobalt.tools. I have also tested with X, and the same issue occurs. I’m not sure if it affects other platforms as I primarily use YouTube downloads.
<!-- gh-comment-id:2629345822 -->
@Muatex commented on GitHub (Feb 2, 2025):
Just tried it, it does not.
I also can't upload the videos to WhatsApp status. It says format not supported
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@Code-Victor commented on GitHub (Feb 14, 2025):
I also can't upload the videos to WhatsApp status. It says format not supported
oh i see you're on ios, remuxed videos on the android version works fine
<!-- gh-comment-id:2660220850 -->
@lostdusty commented on GitHub (Feb 14, 2025):
oh i see you're on ios, remuxed videos on the android version works fine
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Originally created by @Muatex on GitHub (Feb 2, 2025).
Original GitHub issue: https://github.com/imputnet/cobalt/issues/1086
bug description
When downloading videos from Cobalt.tools (tested with YouTube and X), uploading the saved video to WhatsApp results in a black preview as the video cover.
• During upload, the preview appears correctly.
• After upload completes, the preview turns completely black, even though the video is fine, and the starting frame is not black.
This issue is consistently reproducible on iOS (tested with Safari on version 18.3).
reproduction steps
2. Download a video from YouTube (e.g., save to Photos).
3. Upload the downloaded video to WhatsApp.
4. Notice the preview turns black after the upload finishes.
screenshots
links
platform information
Safari on iOS 18.3 iPhone 16 Pro
additional context
This issue has been observed mainly with YouTube videos downloaded via Cobalt.tools. I have also tested with X, and the same issue occurs. I’m not sure if it affects other platforms as I primarily use YouTube downloads.
@dumbmoron commented on GitHub (Feb 2, 2025):
does remuxing help with this? https://cobalt.tools/remux
@Muatex commented on GitHub (Feb 2, 2025):
Just tried it, it does not.
@Code-Victor commented on GitHub (Feb 14, 2025):
I also can't upload the videos to WhatsApp status. It says format not supported
@lostdusty commented on GitHub (Feb 14, 2025):
remux the video on the remux tab
@lostdusty commented on GitHub (Feb 14, 2025):
oh i see you're on ios, remuxed videos on the android version works fine