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[GH-ISSUE #1086] Black preview when uploading downloaded videos to WhatsApp #2116

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opened 2026-04-11 06:33:09 -05:00 by GiteaMirror · 5 comments
GiteaMirror commented 2026-04-11 06:33:09 -05:00
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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

  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

Image

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 ![Image](https://github.com/user-attachments/assets/5ce8185e-32a0-491f-a118-4f6ae098f40b) ### 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.
GiteaMirror added the bug3rd party app support labels 2026-04-11 06:33:09 -05:00
GiteaMirror commented 2026-04-11 06:33:12 -05:00
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@dumbmoron commented on GitHub (Feb 2, 2025):

does remuxing help with this? https://cobalt.tools/remux

<!-- gh-comment-id:2629344034 --> @dumbmoron commented on GitHub (Feb 2, 2025): does remuxing help with this? https://cobalt.tools/remux
GiteaMirror commented 2026-04-11 06:33:14 -05:00
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@Muatex commented on GitHub (Feb 2, 2025):

Just tried it, it does not.

Image

<!-- gh-comment-id:2629345822 --> @Muatex commented on GitHub (Feb 2, 2025): Just tried it, it does not. ![Image](https://github.com/user-attachments/assets/44736bc5-c799-429b-bd2e-58eb4072d35d)
GiteaMirror commented 2026-04-11 06:33:15 -05:00
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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

<!-- gh-comment-id:2658472504 --> @Code-Victor commented on GitHub (Feb 14, 2025): I also can't upload the videos to WhatsApp status. It says format not supported
GiteaMirror commented 2026-04-11 06:33:15 -05:00
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@lostdusty commented on GitHub (Feb 14, 2025):

remux the video on the remux tab

<!-- gh-comment-id:2660219837 --> @lostdusty commented on GitHub (Feb 14, 2025): remux the video on the remux tab
GiteaMirror commented 2026-04-11 06:33:16 -05:00
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@lostdusty commented on GitHub (Feb 14, 2025):

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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Reference: github-starred/cobalt#2116
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