avcodec_get_context_defaults3 from ffmpeg is deprecated

[ywangwxd]

System Information

I am compiling the 4.8.1 version of opencv, it complains about missing function avcodec_get_context_defaults3 from ffmpeg. I found that ffmpeg has already removed this function since 2021 commit. So should the using of this function be removed in opencv source?

Detailed description

 in function `CvVideoWriter_FFMPEG::open(char const*, int, double, int, int, cv::VideoWriterParameters const&)':
cap_ffmpeg.cpp:(.text._ZN20CvVideoWriter_FFMPEG4openEPKcidiiRKN2cv21VideoWriterParametersE+0xcec): undefined reference to `avcodec_get_context_defaults3'

Steps to reproduce

1, compile ffmpeg from source (because I need a third-party hardware encoder/decoder)
2, compile opencv 4.8.1 with ffmpet support

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)

[ywangwxd]

The deprecration notice says this:

This because avcodec_get_context_defaults3 was removed in ffmpeg.
https://github.com/FFmpeg/FFmpeg/commit/ff8f9fcbe558db69f804417d4e9aa2ef9445f304
Reference:

Deprecated:
This function should not be used, as closing and opening a codec context multiple time is not supported.
A new codec context should be allocated for each new use.

[asmorkalov]

The fact that compile stage passed, but linkage failed gives me idea, that header files and binaries of FFMpeg does not match.

[sriramsowmithri9807]

**_

in function CvVideoWriter_FFMPEG::open(char const*, int, double, int, int, cv::VideoWriterParameters const&)': cap_ffmpeg.cpp:(.text._ZN20CvVideoWriter_FFMPEG4openEPKcidiiRKN2cv21VideoWriterParametersE+0xcec): undefined reference to avcodec_get_context_defaults3'

_**

i think it was a syntax error

[sriramsowmithri9807]

 in function `CvVideoWriter_FFMPEG::open(char const*, int, double, int, int, cv::VideoWriterParameters const&)':
cap_ffmpeg.cpp:(.text._ZN20CvVideoWriter_FFMPEG4openEPKcidiiRKN2cv21VideoWriterParametersE+0xcec): undefined reference to `avcodec_get_context_defaults3'

Steps to reproduce
1, compile ffmpeg from source (because I need a third-party hardware encoder/decoder)
2, compile opencv 4.8.1 with ffmpet support

Issue submission checklist
I report the issue, it's not a question
I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
I updated to the latest OpenCV version and the issue is still there
There is reproducer code and related data files (videos, images, onnx, etc) [Done]