[kdemultimedia] [Bug 445397] New: Incompatibility with FFMPEG >=4.2.x: av_find_best_stream now uses a const AVCodec ** parameter (46dac8cf3d) | Invalid conversion from 'const AVCodec*' to 'AVCodec*'

[EndlessEden]

https://bugs.kde.org/show_bug.cgi?id=445397

            Bug ID: 445397
           Summary: Incompatibility with FFMPEG >=4.2.x:
                    av_find_best_stream now uses a const AVCodec **
                    parameter (46dac8cf3d) | Invalid conversion from
                    'const AVCodec*' to 'AVCodec*'
           Product: kdemultimedia
           Version: unspecified
          Platform: Compiled Sources
                OS: All
            Status: REPORTED
          Severity: critical
          Priority: NOR
         Component: ffmpegthumbs
          Assignee: unassigned-bugs at kde.org
          Reporter: eenov1988 at gmail.com
  Target Milestone: ---

SUMMARY

starting with ffmpeg version 4.3, changes to libavformat/libavcodec break
building against these versions.

Currently when attempting to build against these versions, it fails with "no
matching function for call to 'av_find_best_stream'"

'av_find_best_stream' is specified in <libavformat/avformat.h>; however this
header is not included in ffmpegthumbnailer/moviedecoder.cpp 

if the header is added [#include <libavformat/avformat.h>], and rebuilt it
results in a new error " error: invalid conversion from ‘AVCodec**’ to ‘const
AVCodec**’"

This build error ive seen in other projects (decord): (See:
https://github.com/dmlc/decord/pull/160)

ADDITIONAL INFORMATION

build environment:
OS: Linux(Archlinux)
FFmpeg Version: git(master - 104497-g9fd2b39428)
C/CXX Compiler Version: gcc - 11.1.0
QT-Version: 5.15.2+kde+r254 (archlinux packaging)

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