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Add strict validation for encoding parameters #27621

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Kumataro
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@Kumataro Kumataro commented Aug 2, 2025

Close #27557

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

  • I agree to contribute to the project under Apache 2 License.
  • To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
  • The PR is proposed to the proper branch
  • There is a reference to the original bug report and related work
  • There is accuracy test, performance test and test data in opencv_extra repository, if applicable
    Patch to opencv_extra has the same branch name.
  • The feature is well documented and sample code can be built with the project CMake

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Kumataro commented Aug 2, 2025 •
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videoio_images.* tests are failed. This is potential issue.

Before OpenCV3 supports cvSaveImage() C-API function.
And after OpenCV 3.2.0, image_params is used with dummy key and value (0,0).

opencv/modules/videoio/src/cap_images.cpp

Lines 377 to 384 in af32659

CV_Assert(!filename_pattern.empty());
cv::String filename = cv::format(filename_pattern.c_str(), (int)currentframe);
CV_Assert(!filename.empty());
std::vector<int> image_params = params;
image_params.push_back(0); // append parameters 'stop' mark
image_params.push_back(0);
int ret = cvSaveImage(filename.c_str(), image, &image_params[0]);

OpenCV4 drop this C-API, and it is replaced to imwrite() C++ API.

opencv/modules/videoio/src/cap_images.cpp

Lines 388 to 397 in 52bed3c

CV_Assert(!filename_pattern.empty());
cv::String filename = cv::format(filename_pattern.c_str(), (int)currentframe);
CV_Assert(!filename.empty());
std::vector<int> image_params = params;
image_params.push_back(0); // append parameters 'stop' mark
image_params.push_back(0);
cv::Mat img = image.getMat();
cv::imwrite(filename, img, image_params);

We do not have to use params for C++ API. It is better.

Kumataro
Kumataro commented Aug 3, 2025
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Kumataro
Kumataro commented Aug 3, 2025
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@asmorkalov asmorkalov self-requested a review August 4, 2025 05:37
@asmorkalov asmorkalov mentioned this pull request Aug 8, 2025
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@asmorkalov asmorkalov added this to the 4.13.0 milestone Aug 8, 2025
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@Kumataro Thanks a lot for the contribution. We discussed the PR on the core team meeting. Summary:

  • Macro guard is not needed.
  • Let's print warning with CV_LOG_WARNING for the cases, when parameter value is out of range or the parameter is unknown or not supported for the particular codec.
  • Let's saturate values that are out of range.
  • Let's continue file writing and return true, even, if some parameters are not correct. We do not want to break existing code, even if it's not accurate.

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Kumataro commented Aug 8, 2025

Thank you very much for your discussion about this pull request !!

I feel it will be hard to get finished right away.
I would appreciate it if you could wait a little while.

@Kumataro Kumataro marked this pull request as draft August 10, 2025 10:05
@asmorkalov asmorkalov self-assigned this Aug 11, 2025
@Kumataro Kumataro marked this pull request as ready for review August 11, 2025 10:14
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Proposal: Add strict validation for encoding parameters in OpenCV 5
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@Kumataro @asmorkalov