build(deps): Update to FFmpeg 8.0 branch

[cgutman]

Description

This updates FFmpeg to the new 8.0 release branch. I got all of our AMF and NVENC patches upstreamed for FFmpeg 8.0, however a bug was introduced during the upstream AMF rewrite that requires a new patch.

This will require a corresponding change to Sunshine to address some build issues and option names that changed during the upstreaming process.

Screenshot

Issues Fixed or Closed

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[CLAassistant]

All committers have signed the CLA.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[cgutman]

Testing is complete on all platforms so this should be good to go.

[Rongronggg9]

Recent nightly versions of Sunshine break VA-API HEVC encoding on RDNA3.5, resulting in an extra green bar at the bottom. I did not bisect, but I guess this was because [PATCH] avcodec/vaapi_encode: add customized surface alignment was dropped in this PR.

[Rongronggg9]

I did not bisect, but I guess this is because [PATCH] avcodec/vaapi_encode: add customized surface alignment is dropped in this PR.

Confirmed that https://github.com/LizardByte/Sunshine/actions/runs/16784617469 is the last good (successful) build and https://github.com/LizardByte/Sunshine/actions/runs/16966842290 is the first bad (successful) build, where LizardByte/Sunshine#4143 was merged in between.

[inkatail]

I did not bisect, but I guess this is because [PATCH] avcodec/vaapi_encode: add customized surface alignment is dropped in this PR.

Confirmed that https://github.com/LizardByte/Sunshine/actions/runs/16784617469 is the last good (successful) build and https://github.com/LizardByte/Sunshine/actions/runs/16966842290 is the first bad (successful) build, where LizardByte/Sunshine#4143 was merged in between.

This also happens on my RX 6600 (RDNA 2)