FFmpeg: Add a patch for master branch

[guojiansheng0925]

Signed-off-by: Guo Jiansheng jiansheng.guo@intel.com

Description

Add a new patch for master branch. Because the libavcodec/allcodecs.c in FFmpeg changes a lot by following commit:

commit a247ac640df3da573cd661065bf53f37863e2b46 Author: Andreas Rheinhardt andreas.rheinhardt@gmail.com Date: Thu Feb 25 10:50:26 2021 +0100

avcodec: Constify AVCodecs

Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

Issue

Fixes #590

Author(s)

Guo Jiansheng

Performance impact

• [ ] quality
• [ ] memory
• [ ] speed
• [ ] 8 bit
• [ ] 10 bit
• [x] N/A

Merge method

• [x] Allow the maintainer to squash and merge when PR is ready to create a 1-commit to the master branch. The maintainer will be able to fix typos / combine commit messages to create a more readable 1-commit message or use whatever is stated in the 'Description' section
• [x] I will clean up my commits and the maintainer shall use 'rebase and merge' to the master branch