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VideoCapture add support for byte buffer #24400

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gdippolito opened this issue Oct 13, 2023 · 4 comments · May be fixed by #25584
Open

VideoCapture add support for byte buffer #24400

gdippolito opened this issue Oct 13, 2023 · 4 comments · May be fixed by #25584
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@dkurt
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category: videoio feature

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@gdippolito
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Describe the feature and motivation

Hello!

Thanks for your work in this project.

I'm using OpenCV VideoCapture in order to download decode a few frames from a video downloaded from a remote location. OpenCV seems to be working pretty well for both H.264 and H.265 file format but it requires a file handle in the VideoCapture constructor. This means that in order to pass a downloaded object we need to first save to a temporary file and then pass the resulting path passed to VideoCapture.

Would you consider adding support to a byte object in the constructor?

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@vrabaud
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vrabaud commented Oct 16, 2023

May I suggest to actually support vector<uchar> (or just raw pointer) instead of cv::Mat to not fall into the problem with int/size_t like in #22036

@asmorkalov asmorkalov mentioned this issue Oct 17, 2023
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@facug91
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facug91 commented Jan 15, 2024

Here's a SO post with someone's solution for this, which might help https://stackoverflow.com/questions/5237175/process-video-stream-from-memory-buffer

@gdippolito
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Here's a SO post with someone's solution for this, which might help https://stackoverflow.com/questions/5237175/process-video-stream-from-memory-buffer

Thanks @facug91 for the response. Since we have a working solution in C++ would it be much effort to add support to the Python bindings to support a byte object instead of only supporting a file handle?

@dkurt dkurt linked a pull request May 14, 2024 that will close this issue
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@dkurt
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dkurt commented May 15, 2024

Initial version with FFmpeg backend only: #25584

@dkurt dkurt self-assigned this May 15, 2024
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Open VideoCapture from memory buffer dkurt/opencv
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@vrabaud @asmorkalov @facug91 @gdippolito @dkurt