Packman Vendor Change suddenly displaying weird conflicts

The actual version of libavcodec60 from packman is 6.1.1-1699.10.pm.6. You try to install an older version. As you don’t show the relevant repo informations via zypper lr -d, we don’t know if you have setup the repos correctly (auto refresh enabled).

ffmpeg-6-mini-libs and ffmpeg-7-mini-libs does not belong onto any system unless you have a building environment. So don’t install them or uninstall them (there are also several threads regarding this topic). Install the correct packages ffmpeg-6 or ffmpeg-7

Maybe show this script…
A working way how to switch to packman is described in the wiki:
https://en.opensuse.org/SDB:Installing_codecs_from_Packman_repositories

It’s just a script to install stuff (and customize stuff), the bit with the change to packman is as described in the link you provided. The thing is, I don’t have mini-libs installed, checked via zypper search. Here is command you asked.

   | Alias                            | Name                                   | Enabled | GPG Check | Refresh | Priority | Type   | URI                                                            | Service
---+----------------------------------+----------------------------------------+---------+-----------+---------+----------+--------+----------------------------------------------------------------+---------
 1 | NVIDIA:repo-non-free             | repo-non-free                          | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | https://download.nvidia.com/opensuse/tumbleweed                | NVIDIA
 2 | download.opensuse.org-non-oss    | Main Repository (NON-OSS)              | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://download.opensuse.org/tumbleweed/repo/non-oss/          | 
 3 | download.opensuse.org-oss        | Main Repository (OSS)                  | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://download.opensuse.org/tumbleweed/repo/oss/              | 
 4 | download.opensuse.org-tumbleweed | Main Update Repository                 | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://download.opensuse.org/update/tumbleweed/                | 
 5 | openSUSE:repo-non-oss            | repo-non-oss                           | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://cdn.opensuse.org/tumbleweed/repo/non-oss                | openSUSE
 6 | openSUSE:repo-openh264           | repo-openh264                          | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://codecs.opensuse.org/openh264/openSUSE_Tumbleweed        | openSUSE
 7 | openSUSE:repo-oss                | repo-oss                               | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://cdn.opensuse.org/tumbleweed/repo/oss                    | openSUSE
 8 | openSUSE:repo-oss-debug          | repo-oss-debug                         | No      | ----      | ----    |   99     | N/A    | http://cdn.opensuse.org/debug/tumbleweed/repo/oss              | openSUSE
 9 | openSUSE:repo-oss-source         | repo-oss-source                        | No      | ----      | ----    |   99     | N/A    | http://cdn.opensuse.org/source/tumbleweed/repo/oss             | openSUSE
10 | openSUSE:update-tumbleweed       | update-tumbleweed                      | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://cdn.opensuse.org/update/tumbleweed                      | openSUSE
11 | packman-essentials               | packman-essentials                     | Yes     | (r ) Yes  | Yes     |   90     | rpm-md | https://packman.opensuse.net.br/openSUSE_Tumbleweed/Essentials | 
12 | repo-debug                       | openSUSE-Tumbleweed-Debug              | No      | ----      | ----    |   99     | N/A    | http://download.opensuse.org/debug/tumbleweed/repo/oss/        | 
13 | repo-openh264                    | Open H.264 Codec (openSUSE Tumbleweed) | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://codecs.opensuse.org/openh264/openSUSE_Tumbleweed        | 
14 | repo-source                      | openSUSE-Tumbleweed-Source             | No      | ----      | ----    |   99     | N/A    | http://download.opensuse.org/source/tumbleweed/repo/oss/       |