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Open Source Computer Vision Library opencv.org
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Dmitry Kurtaev 8e0c0dc347
Merge pull request #27755 from dkurt:ffmpeg/sws_scale_frame 
Optimize FFmpeg VideoCapture with swscale threads option #27755

### Pull Request Readiness Checklist

resolves https://github.com/opencv/opencv/issues/21969

* Switch to `sws_scale_from` for `libswscale >= 6.4.100` (FFmpeg >= 5.0)
* Use new context init API with threads option (`libswscale >= 8.12.100`: 2a091d4f2e)
* Replicate `sws_getCachedContext` with threads option for `libswscale < 8.12.100`

1 hour mp4 video every frame reading
| HW | sws_scale | sws_scale_frame + 16 threads | sws_scale_frame + 24 threads (#cpus) | 
|---|---|---|---|
| Intel Core i9-12900 CPU | 45.1 sec | 25.4 sec (x1.77) | 30 sec (x1.50) | 
| NVIDIA GPU 4090 | 232 sec | 89.4 sec (x2.59) | 77 sec (x3.01) |

```
import time
import numpy as np
import os
import cv2 as cv

# os.environ["OPENCV_FFMPEG_CAPTURE_OPTIONS"] = "hwaccel;cuvid|video_codec;h264_cuvid|vsync;0"

start = time.time()
video = "test.mp4"
cap = cv.VideoCapture(video, cv.CAP_FFMPEG)
while True:
    has_frame, frame = cap.read()
    if not has_frame:
        break

print(time.time() - start)
```

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

- [x] I agree to contribute to the project under Apache 2 License.
- [x] 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
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake
2025-09-09 14:21:18 +03:00
.github Removed Android test as it's broken for now. 2025-02-18 12:52:24 +03:00
3rdparty Merge pull request #27741 from dkurt:libpng_1.6.45 2025-09-08 09:49:26 +03:00
apps Skip couple of intro frames in interactive calibration tool, if VideoCapture is opened correctly. 2025-08-12 13:58:28 +03:00
cmake Silence unreferenced function with internal linkage has been removed warnings on windows 2025-09-01 16:43:04 +03:00
data Merge pull request #22727 from su77ungr:patch-1 2022-11-17 06:54:25 +00:00
doc Update Conan URL to use official Conan Center 2025-09-09 09:53:08 +02:00
hal Merge pull request #27378 from spacemit-com:4.x 2025-08-26 20:05:08 +03:00
include exclude opencv_contrib modules 2020-02-26 15:12:45 +03:00
modules Merge pull request #27755 from dkurt:ffmpeg/sws_scale_frame 2025-09-09 14:21:18 +03:00
platforms Merge pull request #27607 from asmorkalov:as/apple_kleidicv 2025-07-31 16:05:37 +03:00
samples Fixed logical error in camera calibration tutorial. 2025-08-18 13:07:09 +03:00
.editorconfig add .editorconfig 2018-10-11 17:57:51 +00:00
.gitattributes cmake: generate and install ffmpeg-download.ps1 2018-06-09 13:19:48 +03:00
.gitignore Merge pull request #17165 from komakai:objc-binding 2020-06-08 18:32:53 +00:00
CMakeLists.txt Merge pull request #27581 from dkurt:d.kuryaev/dlpack 2025-08-20 11:43:41 +03:00
CONTRIBUTING.md migration: github.com/opencv/opencv 2016-07-12 12:51:12 +03:00
COPYRIGHT Added OpenCV.AI copyright. 2025-08-01 09:50:10 +03:00
LICENSE Merge pull request #18073 from vpisarev:apache2_license 2020-08-17 11:49:11 +00:00
README.md Space mistake in README.md 2024-03-03 23:37:07 +05:30
SECURITY.md Updated PGP key for security reports 2023-04-19 19:16:55 +03:00

README.md

OpenCV: Open Source Computer Vision Library

Resources

Contributing

Please read the contribution guidelines before starting work on a pull request.

Summary of the guidelines:

  • One pull request per issue;
  • Choose the right base branch;
  • Include tests and documentation;
  • Clean up "oops" commits before submitting;
  • Follow the coding style guide.

Additional Resources