Use FFmpeg 7 with prebuilt bindings for Linux

Use ffmpeg7 feature everywhere and use_prebuilt_binding for Linux
to ensure FFmpeg 7 API signatures regardless of system FFmpeg version.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cfsmp3

src/rust/Cargo.toml

@@ -26,12 +26,10 @@ lib_ccxr = { path = "lib_ccxr" }
 url = "2.5.4"
 encoding_rs = "0.8.5"
 
-# Use CCExtractor's forked rsmpeg
-# - Linux: FFmpeg 6 from apt packages
-# - Windows: FFmpeg 7 from vcpkg
-# - macOS: FFmpeg 7 from Homebrew
+# Use CCExtractor's forked rsmpeg with FFmpeg 7
+# All platforms use ffmpeg7 feature with prebuilt bindings for API consistency
 [target.'cfg(target_os = "linux")'.dependencies]
-rsmpeg = { git = "https://github.com/CCExtractor/rsmpeg.git", default-features = false, features = ["ffmpeg6", "link_system_ffmpeg"], optional = true }
+rsmpeg = { git = "https://github.com/CCExtractor/rsmpeg.git", default-features = false, features = ["ffmpeg7", "link_system_ffmpeg", "use_prebuilt_binding"], optional = true }
 
 [target.'cfg(target_os = "windows")'.dependencies]
 rsmpeg = { git = "https://github.com/CCExtractor/rsmpeg.git", default-features = false, features = ["ffmpeg7", "link_vcpkg_ffmpeg"], optional = true }