iOS FFmpeg capability probe

scripts/ios_ffmpeg_capabilities.m runs the shipped simulator frameworks without building the Flutter app. It checks FLAC, ALAC, 24-bit WAV/AIFF, MP3, Opus and AAC encoding/decoding; analysis filters; spectrum PNG/JPEG conversion; and H.264/HEVC motion decoding and stream-copy remuxing. This complements application tests: it does not prove Flutter routing, download finalization or the Dart TLS proxy.

Prepare the audio plugin's XCFrameworks with its provided scripts/setup_ios.sh from the plugin's ios directory. Boot an iOS simulator, then run the following from the repository root. Framework copies are signed in a temporary directory; the downloaded vendor artifacts remain unchanged.

probe_plugin="$HOME/.pub-cache/hosted/pub.dev/ffmpeg_kit_flutter_new_audio-2.5.7"
probe_work=$(mktemp -d /tmp/spotiflac-ios-ffmpeg.XXXXXX)
mkdir -p "$probe_work/Frameworks"
for framework in "$probe_plugin"/ios/Frameworks/*.xcframework; do
    name=$(basename "$framework" .xcframework)
    cp -R "$framework/ios-arm64_x86_64-simulator/$name.framework" "$probe_work/Frameworks/"
    codesign --force --sign - "$probe_work/Frameworks/$name.framework"
done
xcrun --sdk iphonesimulator clang -fobjc-arc -target arm64-apple-ios16.0-simulator \
    -isysroot "$(xcrun --sdk iphonesimulator --show-sdk-path)" \
    -F "$probe_work/Frameworks" -framework Foundation -framework ffmpegkit \
    -Wl,-rpath,"$probe_work/Frameworks" scripts/ios_ffmpeg_capabilities.m \
    -o "$probe_work/probe"
codesign --force --sign - "$probe_work/probe"
xcrun simctl spawn booted "$probe_work/probe" "$probe_work/results" \
    "$PWD/android/app/src/androidTest/assets"

The audio package exposes HTTP but has no native HTTPS/TLS support. Remote motion input requires the app's scoped Dart TLS proxy. To exercise remote input, append a fixture URL as the last probe argument; use the proxy's HTTP loopback URL when testing the application route. Passing a direct HTTPS URL intentionally reports a capability failure on this package. Run the proxy's Dart tests and Android/iOS application checks before claiming that remote motion playback is preserved.

Remote checks decode the complete fixture, stream-copy it to MP4 with faststart, and decode the resulting MP4 with strict error handling. The probe also prints the shipped HLS demuxer's options. For HLS fixtures with opaque segment URLs, append --disable-hls-extension-check after the proxy URL; this passes -extension_picky 0 only for that input. The other HLS flags in the usage message are diagnostic modes for comparing the native extension checks.

Verified on the shipped iOS simulator audio frameworks:

HTTPS-origin fixture through the Dart proxy	Input options	Decode/remux/decode
Redirected master playlist, AES-128 key, three TS segments	Defaults	Pass
Same content with `.bin`, extensionless and `.ts` segment URLs	Defaults	Rejects segment extension
Same opaque segment URLs	`-allowed_extensions ALL`	Rejects segment extension
Same opaque segment URLs	Both extension lists set to `ALL`	Rejects format/extension mismatch
Same opaque segment URLs	`-extension_picky 0`	Pass

The app uses the final option for scoped HLS proxy input. The proxy still owns the upstream URL allowlist, TLS requests, transfer budget and cancellation.

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iOS FFmpeg capability probe

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