fix(voice): keep published codecs inside the opt-in policy (#2422)

fluxer_app/pkgs/livekit-client/VENDORING.md

@@ -44,9 +44,14 @@ source edits in this package.
    OpenH264 software profile.
 
 8. **Media publishing defaults** (`src/room/defaults.ts`, `src/room/utils.ts`, `src/room/track/options.ts`)
-   Prefers AV1, then HEVC/H.265, H.264, VP9, and VP8 according to actual
-   sender capabilities; pairs advanced codecs with H.264 backup simulcast; and
+   Falls back to H.264, then VP9, VP8, AV1, and HEVC/H.265 according to actual
+   sender capabilities, pairs advanced codecs with H.264 backup simulcast, and
    uses maintain-resolution screen-share defaults with a 4K60-ready bitrate cap.
+   The order puts AV1 and HEVC last because both are opt-in in Fluxer, so a
+   fallback inside `publishTrack` must not land on a codec the user did not
+   enable. Fluxer picks the codec itself before publishing, so this list only
+   applies when the client overrides the request, such as the reconnect
+   republish that runs outside Fluxer's own flows.
 
 9. **High-fidelity Opus SDP munging** (`src/room/PCTransport.ts`)
    Forces Opus RED/FEC, stereo signaling, 10 ms packet time, no DTX, and a

fluxer_app/pkgs/livekit-client/src/room/defaults.test.ts

@@ -4,12 +4,13 @@
 import {describe, expect, it} from 'vitest';
 import {defaultVideoCodec, publishDefaults, roomOptionDefaults} from './defaults.ts';
 import {BackupCodecPolicy} from './track/options.ts';
+import {selectPreferredVideoCodec} from './utils.ts';
 
 describe('Fluxer media publish defaults', () => {
-	it('defaults new video publishes to the advanced codec path with H.264 backup', () => {
-		expect(defaultVideoCodec).toBe('av1');
+	it('defaults new video publishes to an opt-in-safe codec with H.264 backup', () => {
+		expect(defaultVideoCodec).toBe('h264');
 		expect(publishDefaults).toMatchObject({
-			videoCodec: 'av1',
+			videoCodec: 'h264',
 			backupCodec: {codec: 'h264'},
 			backupCodecPolicy: BackupCodecPolicy.SIMULCAST,
 			degradationPreference: 'maintain-resolution',
@@ -18,6 +19,12 @@ describe('Fluxer media publish defaults', () => {
 		});
 	});
 
+	it('falls back away from the opt-in codecs before reaching them', () => {
+		expect(selectPreferredVideoCodec()).toBe('h264');
+		expect(selectPreferredVideoCodec()).not.toBe('av1');
+		expect(selectPreferredVideoCodec()).not.toBe('h265');
+	});
+
 	it('keeps original screen-share publishing at a 4K60-ready transport ceiling', () => {
 		expect(publishDefaults.screenShareEncoding).toMatchObject({
 			maxBitrate: 20_000_000,

fluxer_app/pkgs/livekit-client/src/room/defaults.ts

@@ -6,7 +6,7 @@ import DefaultReconnectPolicy from './DefaultReconnectPolicy.ts';
 import type {AudioCaptureOptions, TrackPublishDefaults, VideoCaptureOptions} from './track/options.ts';
 import {AudioPresets, BackupCodecPolicy, ScreenSharePresets, VideoPresets} from './track/options.ts';
 
-export const defaultVideoCodec = 'av1';
+export const defaultVideoCodec = 'h264';
 
 export const publishDefaults: TrackPublishDefaults = {
 	audioPreset: AudioPresets.music,

fluxer_app/pkgs/livekit-client/src/room/utils.test.ts

@@ -45,12 +45,19 @@ describe('video codec capability helpers', () => {
 		});
 	});
 
-	it('uses the advanced publish ladder from real sender capabilities', () => {
+	it('keeps the opt-in codecs last even when sender capabilities offer them', () => {
 		setSenderCapabilities(['video/VP8', 'video/H264', 'video/VP9', 'video/H265', 'video/AV1']);
 		expect(supportsAV1()).toBe(true);
 		expect(supportsH265()).toBe(true);
 		expect(supportsVP9()).toBe(true);
-		expect(selectPreferredVideoCodec()).toBe('av1');
+		expect(selectPreferredVideoCodec()).toBe('h264');
+	});
+
+	it('falls back to VP9 then VP8 before any opt-in codec', () => {
+		setSenderCapabilities(['video/VP8', 'video/VP9', 'video/H265', 'video/AV1']);
+		expect(selectPreferredVideoCodec()).toBe('vp9');
+		setSenderCapabilities(['video/VP8', 'video/H265', 'video/AV1']);
+		expect(selectPreferredVideoCodec()).toBe('vp8');
 	});
 
 	it('treats legacy AV1X as AV1 and falls through to HEVC when AV1 is absent', () => {

fluxer_app/pkgs/livekit-client/src/room/utils.ts

@@ -32,7 +32,7 @@ import type {ChatMessage, LiveKitReactNativeInfo, TranscriptionSegment} from './
 
 const separator = '|';
 export const ddExtensionURI = 'https://aomediacodec.github.io/av1-rtp-spec/#dependency-descriptor-rtp-header-extension';
-const preferredPublishVideoCodecs: ReadonlyArray<VideoCodec> = ['av1', 'h265', 'h264', 'vp9', 'vp8'];
+const preferredPublishVideoCodecs: ReadonlyArray<VideoCodec> = ['h264', 'vp9', 'vp8', 'av1', 'h265'];
 
 export function unpackStreamId(packed: string): Array<string> {
 	const parts = packed.split(separator);