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* Legacy-container transcode pipeline.\n *\n * One-pass: libav demux → WebCodecs VideoDecoder (or libav software video\n * decode for rv40/etc.) + libav software audio decode → VideoSample /\n * AudioSample → mediabunny Output → MP4 / WebM / MKV Blob.\n *\n * Reached from src/convert/transcode.ts when the input container is one of\n * {avi, asf, flv, rm/rmvb} (see isLibavTranscodeContainer). MP4/MKV/WebM/etc.\n * sources still go through the mediabunny Conversion path in transcode.ts.\n *\n * Scope limits (see docs/dev/ROADMAP.md):\n * - Single video + single audio track. Extra tracks are silently dropped.\n * - 8-bit video only; 10-bit throws with a clear error.\n * - No seek. Linear read-to-EOF.\n * - `outputStream` (streaming output to a WritableStream) is not yet\n * wired for this path — throws with a clear error if requested.\n */\n\n// Lazy imports: libav-demux + the libav-loader chain it pulls in are heavy.\n// To keep the `transcode` bundle scenario below its gzip budget, we only\n// load them when the libav path is actually taken. See the top of\n// transcodeViaLibav() for the dynamic imports.\nimport type { LibavPacket } from \"../util/libav-demux.js\";\nimport {\n AvbridgeError,\n ERR_TRANSCODE_ABORTED,\n ERR_TRANSCODE_UNSUPPORTED_COMBO,\n ERR_TRANSCODE_DECODE,\n ERR_CODEC_NOT_SUPPORTED,\n} from \"../errors.js\";\nimport type {\n MediaContext,\n TranscodeOptions,\n ConvertResult,\n OutputVideoCodec,\n OutputAudioCodec,\n TranscodeQuality,\n} from \"../types.js\";\n\n/** @internal */\nexport function isLibavTranscodeContainer(container: string): boolean {\n return (\n container === \"avi\" ||\n container === \"asf\" ||\n container === \"flv\" ||\n container === \"rm\" // RealMedia (.rm / .rmvb) — rv40/cook via libav software decode\n );\n}\n\nexport async function transcodeViaLibav(\n ctx: MediaContext,\n options: TranscodeOptions,\n): Promise {\n const outputFormat = options.outputFormat ?? \"mp4\";\n // Output format gate: mp4, webm, and mkv are supported. The shared\n // createOutputFormat helper in remux.ts handles the muxer side.\n if (outputFormat !== \"mp4\" && outputFormat !== \"webm\" && outputFormat !== \"mkv\") {\n throw new AvbridgeError(\n ERR_TRANSCODE_UNSUPPORTED_COMBO,\n `legacy-container transcode supports MP4, WebM, and MKV output (got \"${outputFormat}\").`,\n `Use outputFormat: \"mp4\", \"webm\", or \"mkv\".`,\n );\n }\n // Codec defaults depend on output format. `transcode()` already calls\n // validateCodecCompatibility with the user-supplied codecs, but when\n // we're reached directly or with just outputFormat set, pick sensible\n // defaults per container.\n const videoCodec: OutputVideoCodec =\n options.videoCodec ?? (outputFormat === \"webm\" ? \"vp9\" : \"h264\");\n const audioCodec: OutputAudioCodec =\n options.audioCodec ?? (outputFormat === \"webm\" ? \"opus\" : \"aac\");\n const quality: TranscodeQuality = options.quality ?? \"medium\";\n options.signal?.throwIfAborted();\n\n // Everything from here is lazily loaded so the `transcode` scenario\n // doesn't pay for libav/mediabunny weight just because this file is\n // on the import graph.\n const [\n mb,\n { openLibavDemux, sanitizePacketTimestamp, sanitizeFrameTimestamp, libavFrameToInterleavedFloat32 },\n { normalizeSource },\n { createOutputFormat, mimeForFormat, generateFilename },\n ] = await Promise.all([\n import(\"mediabunny\"),\n import(\"../util/libav-demux.js\"),\n import(\"../util/source.js\"),\n import(\"./remux.js\"),\n ]);\n\n // ── Open the demux session ──────────────────────────────────────────\n const normalized = await normalizeSource(ctx.source);\n const demux = await openLibavDemux({\n source: normalized,\n filename: ctx.name ?? \"input.bin\",\n context: ctx,\n // transport config is not yet threaded through ConvertOptions; add\n // later if URL-source transcode with signed URLs becomes a need.\n });\n\n try {\n options.signal?.throwIfAborted();\n\n if (!demux.videoStream && !demux.audioStream) {\n throw new Error(\"transcode: source has no decodable tracks\");\n }\n\n // ── Set up mediabunny Output (BufferTarget — in-memory) ──────────\n // outputStream is not yet supported for the libav path — the\n // sample-source + encoder chain doesn't expose the same StreamTarget\n // hook that mediabunny's Conversion uses internally. Flag loudly.\n if (options.outputStream) {\n throw new AvbridgeError(\n ERR_TRANSCODE_UNSUPPORTED_COMBO,\n \"outputStream is not yet supported for the libav-backed transcode path.\",\n \"Remove the outputStream option to receive the transcoded blob in memory. Streaming output for this path is on the roadmap.\",\n );\n }\n const bufferTarget = new mb.BufferTarget();\n const output = new mb.Output({\n format: createOutputFormat(mb, outputFormat),\n target: bufferTarget,\n });\n\n // ── Bridge (libavjs-webcodecs-bridge) for packet → EncodedVideoChunk\n const bridge = await loadBridge();\n\n // ── Video decoder (WebCodecs) + sample source (mediabunny) ───────\n // Video decode has two possible paths:\n // - WebCodecs (hardware or browser's software decoder) — used when\n // `VideoDecoder.isConfigSupported(config)` returns true. Fast.\n // - libav software decode — used when WebCodecs can't handle the codec.\n // Required for RealMedia (rv40/etc.), where the source codec isn't in\n // any browser. The output is still a VideoFrame (via the bridge's\n // laFrameToVideoFrame), so the downstream queue+drain is unchanged.\n let videoDecoder: VideoDecoder | null = null;\n let videoSoftDec: { c: number; pkt: number; frame: number } | null = null;\n let videoSource: InstanceType | null = null;\n let videoBsfCtx: number | null = null;\n let videoBsfPkt: number | null = null;\n let videoWidth = 0;\n let videoHeight = 0;\n let videoTimeBase: [number, number] | undefined;\n\n // Explicit queue + drain for VideoDecoder.output → videoSource.add.\n // VideoDecoder.output is fire-and-forget, videoSource.add is async\n // and backpressures. Without a queue + single-flight drain, we'd\n // either lose backpressure (memory blow-up) or let in-flight `add`\n // calls interleave out of order. Phase 1 correctness depends on this.\n const frameQueue: VideoFrame[] = [];\n const MAX_QUEUE = 16;\n let draining = false;\n let drainError: Error | null = null;\n // Promise of the currently-running drain (for explicit await at EOF).\n let activeDrain: Promise | null = null;\n\n const drain = (): Promise => {\n if (draining) return activeDrain ?? Promise.resolve();\n draining = true;\n const run = (async () => {\n try {\n while (frameQueue.length > 0 && !drainError) {\n const frame = frameQueue.shift()!;\n try {\n const sample = new mb.VideoSample(frame, {\n timestamp: (frame.timestamp ?? 0) / 1_000_000, // µs → s\n });\n await videoSource!.add(sample);\n } finally {\n frame.close();\n }\n }\n } catch (err) {\n drainError = err as Error;\n // Release any queued frames so we don't leak VideoFrames.\n while (frameQueue.length > 0) {\n try { frameQueue.shift()!.close(); } catch { /* ignore */ }\n }\n } finally {\n draining = false;\n activeDrain = null;\n }\n })();\n activeDrain = run;\n return run;\n };\n\n if (demux.videoStream && !options.dropVideo) {\n try {\n // Phase 1: refuse 10-bit. Neither decode path produces pixel\n // formats that mediabunny's encoders reliably consume.\n const bitDepth = ctx.videoTracks[0]?.bitDepth ?? 8;\n if (bitDepth > 8) {\n throw new AvbridgeError(\n ERR_TRANSCODE_UNSUPPORTED_COMBO,\n `transcode: 10-bit video is not supported in this release (source bit depth: ${bitDepth}).`,\n `Phase 1 transcode handles 8-bit video only. 10-bit support is on the roadmap.`,\n );\n }\n\n if (demux.videoStream.time_base_num && demux.videoStream.time_base_den) {\n videoTimeBase = [demux.videoStream.time_base_num, demux.videoStream.time_base_den];\n }\n\n // Try WebCodecs first. If the bridge can build a config AND the\n // browser's VideoDecoder supports it, use hardware/native decode.\n // Otherwise fall back to libav software decode (rv40, etc.).\n let config: VideoDecoderConfig | null = null;\n try {\n config = await bridge.videoStreamToConfig(demux.libav, demux.videoStream);\n } catch {\n config = null;\n }\n const supported = config\n ? await VideoDecoder.isConfigSupported(config).catch(() => ({ supported: false }))\n : { supported: false };\n\n videoWidth = (config?.codedWidth ?? ctx.videoTracks[0]?.width) ?? 0;\n videoHeight = (config?.codedHeight ?? ctx.videoTracks[0]?.height) ?? 0;\n\n if (config && supported.supported) {\n // ── WebCodecs path ──\n videoDecoder = new VideoDecoder({\n output: (frame) => {\n if (frameQueue.length >= MAX_QUEUE) {\n frame.close();\n return;\n }\n frameQueue.push(frame);\n void drain();\n },\n error: (err) => {\n drainError = err as unknown as Error;\n },\n });\n videoDecoder.configure(config);\n } else {\n // ── libav software decode path ──\n // RealMedia (rv10/20/30/40) and any other codec WebCodecs doesn't\n // support lands here. The libav variant picker already routes\n // rm/rv* to the \"avbridge\" variant via codec-set inspection.\n const libavSoft = demux.libav as unknown as LibavSoftVideo;\n const [, c, pkt, frame] = await libavSoft.ff_init_decoder(\n demux.videoStream.codec_id,\n { codecpar: demux.videoStream.codecpar },\n );\n videoSoftDec = { c, pkt, frame };\n }\n\n videoSource = new mb.VideoSampleSource({\n codec: avbridgeVideoToMediabunny(videoCodec),\n bitrate: qualityToMediabunny(mb, quality, options.videoBitrate),\n ...(options.frameRate !== undefined ? { frameRate: options.frameRate } : {}),\n ...(options.hardwareAcceleration !== undefined\n ? { hardwareAcceleration: options.hardwareAcceleration }\n : {}),\n // Progress reporting: media-time-based via each encoded packet.\n onEncodedPacket: options.onProgress\n ? (packet) => {\n const t = packet.timestamp;\n if (Number.isFinite(t) && ctx.duration && ctx.duration > 0) {\n const pct = Math.min(100, (t / ctx.duration) * 100);\n options.onProgress!({ percent: pct, bytesWritten: 0 });\n }\n }\n : undefined,\n });\n\n const videoMeta: { width?: number; height?: number; frameRate?: number } = {};\n if (options.width !== undefined) videoMeta.width = options.width;\n else if (videoWidth > 0) videoMeta.width = videoWidth;\n if (options.height !== undefined) videoMeta.height = options.height;\n else if (videoHeight > 0) videoMeta.height = videoHeight;\n if (options.frameRate !== undefined) videoMeta.frameRate = options.frameRate;\n output.addVideoTrack(videoSource, videoMeta);\n\n // mpeg4 packed-bframes BSF — same as hybrid/fallback.\n if (ctx.videoTracks[0]?.codec === \"mpeg4\") {\n const runtime = demux.libav as unknown as LibavBsf;\n try {\n videoBsfCtx = await runtime.av_bsf_list_parse_str_js(\"mpeg4_unpack_bframes\");\n if (videoBsfCtx != null && videoBsfCtx >= 0) {\n const parIn = await runtime.AVBSFContext_par_in(videoBsfCtx);\n await runtime.avcodec_parameters_copy(parIn, demux.videoStream.codecpar);\n await runtime.av_bsf_init(videoBsfCtx);\n videoBsfPkt = await (demux.libav as unknown as { av_packet_alloc(): Promise })\n .av_packet_alloc();\n } else {\n videoBsfCtx = null;\n }\n } catch {\n videoBsfCtx = null;\n }\n }\n } catch (err) {\n if (err instanceof AvbridgeError) throw err;\n throw new AvbridgeError(\n ERR_CODEC_NOT_SUPPORTED,\n `transcode: video decoder init failed: ${(err as Error).message}`,\n `The source's video codec may not be supported by this browser's WebCodecs implementation.`,\n );\n }\n }\n\n // ── Audio decoder (libav software) + sample source ───────────────\n interface SoftDecoder { c: number; pkt: number; frame: number; }\n let audioDec: SoftDecoder | null = null;\n let audioSource: InstanceType | null = null;\n let audioTimeBase: [number, number] | undefined;\n\n const includeAudio = demux.audioStream && !options.dropAudio;\n if (includeAudio) {\n try {\n const libav = demux.libav as unknown as LibavAudio;\n const [, c, pkt, frame] = await libav.ff_init_decoder(\n demux.audioStream!.codec_id,\n { codecpar: demux.audioStream!.codecpar },\n );\n audioDec = { c, pkt, frame };\n if (demux.audioStream!.time_base_num && demux.audioStream!.time_base_den) {\n audioTimeBase = [\n demux.audioStream!.time_base_num,\n demux.audioStream!.time_base_den,\n ];\n }\n\n audioSource = new mb.AudioSampleSource({\n codec: avbridgeAudioToMediabunny(audioCodec),\n bitrate: qualityToMediabunny(mb, quality, options.audioBitrate),\n });\n output.addAudioTrack(audioSource);\n } catch (err) {\n const codecName = ctx.audioTracks[0]?.codec ?? \"unknown\";\n throw new AvbridgeError(\n ERR_CODEC_NOT_SUPPORTED,\n `transcode: no decoder available for audio codec \"${codecName}\" in this libav variant (${(err as Error).message}).`,\n `The file may still play via createPlayer() (fallback strategy). Pass { dropAudio: true } to transcode video-only.`,\n );\n }\n } else if (options.dropAudio) {\n // Caller asked for video-only — don't add an audio track.\n }\n\n if (!videoSource && !audioSource) {\n throw new AvbridgeError(\n ERR_TRANSCODE_UNSUPPORTED_COMBO,\n \"transcode: no video or audio track to encode (did you set both dropVideo and dropAudio?).\",\n \"Remove dropVideo or dropAudio to include at least one track.\",\n );\n }\n\n await output.start();\n\n // ── Synthetic timestamp counters for packets without valid PTS ──\n const videoFps = ctx.videoTracks[0]?.fps && ctx.videoTracks[0]!.fps > 0\n ? ctx.videoTracks[0]!.fps\n : 30;\n const videoFrameStepUs = Math.max(1, Math.round(1_000_000 / videoFps));\n let syntheticVideoUs = 0;\n let syntheticAudioUs = 0;\n\n // BSF helpers (only if bsfCtx initialized)\n const libavFull = demux.libav as unknown as LibavBsf & { ff_copyin_packet(a: number, b: LibavPacket): Promise; ff_copyout_packet(a: number): Promise; };\n async function applyBSF(packets: LibavPacket[]): Promise {\n if (!videoBsfCtx || !videoBsfPkt) return packets;\n const out: LibavPacket[] = [];\n for (const pkt of packets) {\n await libavFull.ff_copyin_packet(videoBsfPkt, pkt);\n const sendErr = await libavFull.av_bsf_send_packet(videoBsfCtx, videoBsfPkt);\n if (sendErr < 0) { out.push(pkt); continue; }\n while (true) {\n const recvErr = await libavFull.av_bsf_receive_packet(videoBsfCtx, videoBsfPkt);\n if (recvErr < 0) break;\n out.push(await libavFull.ff_copyout_packet(videoBsfPkt));\n }\n }\n return out;\n }\n\n // Guarded access: signal cancellation is honored between batches\n // and at queue-wait checkpoints.\n const ac = options.signal;\n function throwIfAborted(): void {\n if (ac?.aborted) {\n throw new AvbridgeError(\n ERR_TRANSCODE_ABORTED,\n \"transcode: aborted by caller.\",\n undefined,\n );\n }\n }\n\n function throwIfDrainError(): void {\n if (drainError) {\n const msg = drainError.message;\n throw new AvbridgeError(\n ERR_TRANSCODE_DECODE,\n `transcode: video decoder error: ${msg}`,\n \"This usually indicates the WebCodecs decoder rejected a malformed packet.\",\n );\n }\n }\n\n // ── Pump ────────────────────────────────────────────────────────\n const onVideoPacketsWebCodecs = videoDecoder\n ? async (pkts: LibavPacket[]) => {\n throwIfAborted();\n throwIfDrainError();\n while (\n !ac?.aborted &&\n (videoDecoder!.decodeQueueSize > 16 || frameQueue.length >= MAX_QUEUE - 2)\n ) {\n await new Promise((r) => setTimeout(r, 10));\n }\n throwIfAborted();\n\n const processed = await applyBSF(pkts);\n const bridgeAny = bridge as unknown as {\n packetToEncodedVideoChunk(pkt: unknown, stream: unknown): EncodedVideoChunk;\n };\n for (const pkt of processed) {\n sanitizePacketTimestamp(pkt, () => {\n const ts = syntheticVideoUs;\n syntheticVideoUs += videoFrameStepUs;\n return ts;\n }, videoTimeBase);\n try {\n const chunk = bridgeAny.packetToEncodedVideoChunk(pkt, demux.videoStream);\n videoDecoder!.decode(chunk);\n } catch (err) {\n throw new AvbridgeError(\n ERR_TRANSCODE_DECODE,\n `transcode: packet → EncodedVideoChunk failed: ${(err as Error).message}`,\n undefined,\n );\n }\n }\n }\n : undefined;\n\n const onVideoPacketsSoftware = videoSoftDec\n ? async (pkts: LibavPacket[]) => {\n throwIfAborted();\n throwIfDrainError();\n // Only frameQueue backpressure — no WebCodecs queue.\n while (!ac?.aborted && frameQueue.length >= MAX_QUEUE - 2) {\n await new Promise((r) => setTimeout(r, 10));\n }\n throwIfAborted();\n\n const libavSoft = demux.libav as unknown as LibavSoftVideo;\n let frames;\n try {\n frames = await libavSoft.ff_decode_multi(\n videoSoftDec!.c, videoSoftDec!.pkt, videoSoftDec!.frame, pkts,\n { ignoreErrors: true },\n );\n } catch (err) {\n throw new AvbridgeError(\n ERR_TRANSCODE_DECODE,\n `transcode: software video decode failed: ${(err as Error).message}`,\n undefined,\n );\n }\n for (const f of frames) {\n sanitizeFrameTimestamp(f, () => {\n const ts = syntheticVideoUs;\n syntheticVideoUs += videoFrameStepUs;\n return ts;\n }, videoTimeBase);\n try {\n // Bridge consumes any libav-decoded frame (software or\n // hardware) and returns a WebCodecs VideoFrame.\n const vf = bridge.laFrameToVideoFrame(f, { timeBase: [1, 1_000_000] });\n if (frameQueue.length >= MAX_QUEUE) {\n vf.close();\n } else {\n frameQueue.push(vf);\n void drain();\n }\n } catch (err) {\n throw new AvbridgeError(\n ERR_TRANSCODE_DECODE,\n `transcode: laFrameToVideoFrame failed: ${(err as Error).message}`,\n undefined,\n );\n }\n }\n }\n : undefined;\n\n await demux.pump({\n signal: ac,\n onVideoPackets: onVideoPacketsWebCodecs ?? onVideoPacketsSoftware,\n onAudioPackets: audioDec\n ? async (pkts) => {\n throwIfAborted();\n await decodeAudioBatch(pkts, false);\n }\n : undefined,\n onEof: async () => {\n // Drain video: flush decoder, then wait for our queue to empty.\n if (videoDecoder && videoDecoder.state === \"configured\") {\n try { await videoDecoder.flush(); } catch { /* ignore */ }\n }\n if (videoSoftDec) {\n // Flush the software decoder with fin: true so any internally\n // buffered frames come out.\n const libavSoft = demux.libav as unknown as LibavSoftVideo;\n try {\n const tail = await libavSoft.ff_decode_multi(\n videoSoftDec.c, videoSoftDec.pkt, videoSoftDec.frame, [],\n { fin: true, ignoreErrors: true },\n );\n for (const f of tail) {\n sanitizeFrameTimestamp(f, () => {\n const ts = syntheticVideoUs;\n syntheticVideoUs += videoFrameStepUs;\n return ts;\n }, videoTimeBase);\n try {\n const vf = bridge.laFrameToVideoFrame(f, { timeBase: [1, 1_000_000] });\n frameQueue.push(vf);\n void drain();\n } catch { /* ignore per-frame failures during flush */ }\n }\n } catch { /* ignore */ }\n }\n // A final drain() kick to consume any post-flush frames.\n await drain();\n // Drain audio: flush the libav decoder.\n if (audioDec) {\n await decodeAudioBatch([], true);\n }\n },\n });\n\n throwIfAborted();\n throwIfDrainError();\n\n // Close the sample sources so mediabunny finalizes track metadata.\n videoSource?.close();\n audioSource?.close();\n\n await output.finalize();\n\n if (!bufferTarget.buffer) {\n throw new Error(\"transcode: mediabunny produced no output buffer\");\n }\n const mimeType = mimeForFormat(outputFormat);\n const blob = new Blob([bufferTarget.buffer], { type: mimeType });\n options.onProgress?.({ percent: 100, bytesWritten: blob.size });\n\n return {\n blob,\n mimeType,\n container: outputFormat,\n videoCodec: videoSource ? videoCodec : undefined,\n audioCodec: audioSource ? audioCodec : undefined,\n duration: ctx.duration,\n filename: generateFilename(ctx.name, outputFormat),\n };\n\n // ── Helpers closing over the above state ────────────────────────\n async function decodeAudioBatch(pkts: LibavPacket[], flush: boolean): Promise {\n if (!audioDec || !audioSource) return;\n const libav = demux.libav as unknown as LibavAudio;\n let frames;\n try {\n frames = await libav.ff_decode_multi(\n audioDec.c,\n audioDec.pkt,\n audioDec.frame,\n pkts,\n flush ? { fin: true, ignoreErrors: true } : { ignoreErrors: true },\n );\n } catch (err) {\n throw new AvbridgeError(\n ERR_TRANSCODE_DECODE,\n `transcode: audio decode failed: ${(err as Error).message}`,\n undefined,\n );\n }\n for (const f of frames) {\n sanitizeFrameTimestamp(f, () => {\n const ts = syntheticAudioUs;\n const samples = f.nb_samples ?? 1024;\n const sampleRate = f.sample_rate ?? 44100;\n syntheticAudioUs += Math.round((samples * 1_000_000) / sampleRate);\n return ts;\n }, audioTimeBase);\n const pcm = libavFrameToInterleavedFloat32(f);\n if (!pcm) continue;\n // AudioSample wants a typed AudioSampleInit. f32 interleaved.\n const sample = new mb.AudioSample({\n data: pcm.data,\n format: \"f32\",\n numberOfChannels: pcm.channels,\n sampleRate: pcm.sampleRate,\n timestamp: (f.pts ?? 0) / 1_000_000,\n });\n await audioSource.add(sample);\n }\n }\n } finally {\n // Teardown: close decoders, free BSF, close demuxer.\n try { await demux.destroy(); } catch { /* ignore */ }\n // Note: videoDecoder / audioDec cleanup happens implicitly; the demuxer\n // destroy releases the fmt_ctx, and our sample sources + Output\n // finalization release the encoder side. Explicit frees here would\n // race with in-flight decode calls on error paths; we accept the\n // short-lived leak.\n }\n // Reference types used in this file. Declared locally to avoid leaking\n // into the shared helper module.\n interface LibavAudio {\n ff_init_decoder(\n codec: number | string,\n config?: { codecpar?: number; time_base?: [number, number] },\n ): Promise<[number, number, number, number]>;\n ff_decode_multi(\n c: number,\n pkt: number,\n frame: number,\n packets: LibavPacket[],\n opts?: { fin?: boolean; ignoreErrors?: boolean },\n ): Promise;\n }\n // Software video decode uses the same surface as audio. Aliased for\n // readability at callsites.\n type LibavSoftVideo = LibavAudio;\n interface LibavBsf {\n av_bsf_list_parse_str_js(str: string): Promise;\n AVBSFContext_par_in(ctx: number): Promise;\n avcodec_parameters_copy(dst: number, src: number): Promise;\n av_bsf_init(ctx: number): Promise;\n av_bsf_send_packet(ctx: number, pkt: number): Promise;\n av_bsf_receive_packet(ctx: number, pkt: number): Promise;\n }\n}\n\n// ── Helpers ─────────────────────────────────────────────────────────────\n\nasync function loadBridge(): Promise {\n try {\n const wrapper = await import(\"../strategies/fallback/libav-import.js\");\n return wrapper.libavBridge as unknown as BridgeModule;\n } catch (err) {\n throw new Error(`failed to load libavjs-webcodecs-bridge: ${(err as Error).message}`);\n }\n}\n\ninterface BridgeModule {\n videoStreamToConfig(libav: unknown, stream: unknown): Promise;\n packetToEncodedVideoChunk(pkt: unknown, stream: unknown): EncodedVideoChunk;\n laFrameToVideoFrame(\n frame: unknown,\n opts?: { timeBase?: [number, number]; transfer?: boolean },\n ): VideoFrame;\n}\n\nfunction avbridgeVideoToMediabunny(c: OutputVideoCodec): \"avc\" | \"hevc\" | \"vp9\" | \"av1\" {\n switch (c) {\n case \"h264\": return \"avc\";\n case \"h265\": return \"hevc\";\n case \"vp9\": return \"vp9\";\n case \"av1\": return \"av1\";\n }\n}\n\nfunction avbridgeAudioToMediabunny(c: OutputAudioCodec): \"aac\" | \"opus\" | \"flac\" {\n switch (c) {\n case \"aac\": return \"aac\";\n case \"opus\": return \"opus\";\n case \"flac\": return \"flac\";\n }\n}\n\nfunction qualityToMediabunny(\n mb: typeof import(\"mediabunny\"),\n quality: TranscodeQuality,\n override: number | undefined,\n): number | InstanceType {\n if (override !== undefined) return override;\n switch (quality) {\n case \"low\": return mb.QUALITY_LOW;\n case \"medium\": return mb.QUALITY_MEDIUM;\n case \"high\": return mb.QUALITY_HIGH;\n case \"very-high\": return mb.QUALITY_VERY_HIGH;\n }\n}\n","/**\n * Standalone transcode function: re-encode media into a modern container with\n * modern codecs. Unlike {@link remux}, this is a lossy operation that decodes\n * and re-encodes the streams.\n *\n * Built on top of mediabunny's `Conversion` class which handles the full\n * decode → encode → mux pipeline. WebCodecs encoders are used when available;\n * mediabunny falls back to other paths internally.\n *\n * Limitations in v1:\n * - Input must be in a mediabunny-readable container (MP4, MKV, WebM, OGG, ...).\n * AVI/ASF/FLV sources are not yet supported by transcode (use remux + native\n * playback or wait for v1.1).\n */\n\nimport { probe } from \"../probe/index.js\";\nimport { buildMediabunnySourceFromInput } from \"../probe/mediabunny.js\";\nimport { createOutputFormat, mimeForFormat, generateFilename } from \"./remux.js\";\nimport { isLibavTranscodeContainer, transcodeViaLibav } from \"./transcode-libav.js\";\nimport { AvbridgeError, ERR_CONTAINER_NOT_SUPPORTED } from \"../errors.js\";\nimport type {\n MediaInput,\n MediaContext,\n TranscodeOptions,\n ConvertResult,\n OutputFormat,\n OutputVideoCodec,\n OutputAudioCodec,\n TranscodeQuality,\n} from \"../types.js\";\n\n/** Containers mediabunny can demux. AVI/ASF/FLV are not in this set. */\nconst MEDIABUNNY_CONTAINERS = new Set([\n \"mp4\", \"mov\", \"mkv\", \"webm\", \"ogg\", \"wav\", \"mp3\", \"flac\", \"adts\",\n]);\n\n/**\n * Transcode a media source into a modern container with modern codecs.\n *\n * Re-encodes both video and audio. Use {@link remux} instead when the source\n * codecs are already modern and only the container needs changing — it's much\n * faster and lossless.\n */\nexport async function transcode(\n source: MediaInput,\n options: TranscodeOptions = {},\n): Promise {\n const outputFormat: OutputFormat = options.outputFormat ?? \"mp4\";\n const videoCodec = options.videoCodec ?? defaultVideoCodec(outputFormat);\n const audioCodec = options.audioCodec ?? defaultAudioCodec(outputFormat);\n const quality = options.quality ?? \"medium\";\n\n validateCodecCompatibility(outputFormat, videoCodec, audioCodec);\n options.signal?.throwIfAborted();\n\n const ctx = await probe(source);\n options.signal?.throwIfAborted();\n\n // AVI/ASF/FLV → the libav-demux-backed pipeline (Phase 1: MP4 output only).\n if (isLibavTranscodeContainer(ctx.container)) {\n return transcodeViaLibav(ctx, options);\n }\n\n if (!MEDIABUNNY_CONTAINERS.has(ctx.container)) {\n throw new AvbridgeError(\n ERR_CONTAINER_NOT_SUPPORTED,\n `Cannot transcode \"${ctx.container}\" sources. ` +\n `transcode() supports mediabunny-readable containers (MP4, MKV, WebM, OGG, MP3, FLAC, WAV, MOV) and legacy containers via the libav path (AVI, ASF, FLV).`,\n `If this is a legacy container we don't yet support, use createPlayer() to play it. Transcode support for more containers is on the roadmap.`,\n );\n }\n\n return doTranscode(ctx, outputFormat, videoCodec, audioCodec, quality, options);\n}\n\n/**\n * One attempt at the full mediabunny conversion. Each attempt allocates\n * fresh `Input` / `Output` / `Conversion` instances because they are all\n * single-use in mediabunny.\n *\n * Returns the muxed `ArrayBuffer` on success. Throws on failure.\n */\nasync function attemptTranscode(\n ctx: MediaContext,\n outputFormat: OutputFormat,\n videoCodec: OutputVideoCodec,\n audioCodec: OutputAudioCodec,\n quality: TranscodeQuality,\n options: TranscodeOptions,\n): Promise {\n const mb = await import(\"mediabunny\");\n\n const input = new mb.Input({\n source: await buildMediabunnySourceFromInput(mb, ctx.source),\n formats: mb.ALL_FORMATS,\n });\n\n // When outputStream is provided, pipe chunks directly to the stream\n // instead of accumulating into a buffer. This keeps memory usage flat\n // regardless of file size.\n let bytesWritten = 0;\n const useStream = !!options.outputStream;\n const bufferTarget = useStream ? null : new mb.BufferTarget();\n const streamTarget = useStream\n ? new mb.StreamTarget(new WritableStream({\n write(chunk: { type: string; data: Uint8Array; position: number }) {\n bytesWritten += chunk.data.byteLength;\n const writer = options.outputStream!.getWriter();\n return writer.write(chunk.data).then(() => writer.releaseLock());\n },\n }))\n : null;\n\n const output = new mb.Output({\n format: createOutputFormat(mb, outputFormat),\n target: (streamTarget ?? bufferTarget)!,\n });\n\n // Build mediabunny ConversionVideoOptions\n const videoOptions = options.dropVideo\n ? { discard: true as const }\n : {\n codec: avbridgeVideoToMediabunny(videoCodec),\n bitrate: options.videoBitrate ?? qualityToMediabunny(mb, quality),\n forceTranscode: true,\n ...(options.width !== undefined ? { width: options.width } : {}),\n ...(options.height !== undefined ? { height: options.height } : {}),\n ...(options.width !== undefined && options.height !== undefined\n ? { fit: \"contain\" as const }\n : {}),\n ...(options.frameRate !== undefined ? { frameRate: options.frameRate } : {}),\n ...(options.hardwareAcceleration !== undefined\n ? { hardwareAcceleration: options.hardwareAcceleration }\n : {}),\n };\n\n const audioOptions = options.dropAudio\n ? { discard: true as const }\n : {\n codec: avbridgeAudioToMediabunny(audioCodec),\n bitrate: options.audioBitrate ?? qualityToMediabunny(mb, quality),\n forceTranscode: true,\n };\n\n const conversion = await mb.Conversion.init({\n input,\n output,\n video: videoOptions,\n audio: audioOptions,\n showWarnings: false,\n });\n\n if (!conversion.isValid) {\n const reasons = conversion.discardedTracks\n .map((d) => `${d.track.type} track discarded: ${d.reason}`)\n .join(\"; \");\n throw new Error(\n `Cannot transcode: mediabunny rejected the conversion. ${reasons || \"(no reason given)\"}`,\n );\n }\n\n // Wire progress\n if (options.onProgress) {\n const onProgress = options.onProgress;\n conversion.onProgress = (p) => {\n onProgress({ percent: p * 100, bytesWritten: 0 });\n };\n }\n\n // Wire cancellation\n let abortHandler: (() => void) | undefined;\n if (options.signal) {\n options.signal.throwIfAborted();\n abortHandler = () => void conversion.cancel();\n options.signal.addEventListener(\"abort\", abortHandler, { once: true });\n }\n\n try {\n await conversion.execute();\n } finally {\n if (abortHandler && options.signal) {\n options.signal.removeEventListener(\"abort\", abortHandler);\n }\n }\n\n if (useStream) {\n return null; // data already written to outputStream\n }\n if (!bufferTarget!.buffer) {\n throw new Error(\"Transcode failed: mediabunny produced no output buffer.\");\n }\n return bufferTarget!.buffer;\n}\n\n/**\n * Detect the \"Encoding error\" failure pattern that headless Chromium's\n * H.264 WebCodecs encoder hits on its first call per page. The encoder\n * is fully usable on the second attempt, so we retry once.\n *\n * See — this is a known first-call init\n * issue in the OS-backed encoder pipeline (VideoToolbox on macOS).\n */\nfunction isLikelyEncoderInitError(err: unknown): boolean {\n if (!err) return false;\n const msg = err instanceof Error ? err.message : String(err);\n const lower = msg.toLowerCase();\n // The exact strings WebCodecs / mediabunny surface for encoder failures.\n return (\n lower.includes(\"encoding error\") ||\n lower.includes(\"encoder\") ||\n lower.includes(\"encode failed\")\n );\n}\n\nfunction describeError(err: unknown): string {\n if (!err) return \"(unknown)\";\n if (err instanceof Error) return err.message;\n return String(err);\n}\n\n/**\n * Maximum encoder retry attempts. Headless Chromium's H.264 WebCodecs\n * encoder hits a first-call init failure and *usually* recovers on the\n * second attempt — but in rare cases the second attempt also fails. Two\n * extra attempts (3 total) is enough to make the smoke test reliable\n * without masking real bugs.\n */\nconst MAX_ENCODER_RETRIES = 2;\n\nasync function doTranscode(\n ctx: MediaContext,\n outputFormat: OutputFormat,\n videoCodec: OutputVideoCodec,\n audioCodec: OutputAudioCodec,\n quality: TranscodeQuality,\n options: TranscodeOptions,\n): Promise {\n const notes: string[] = [];\n let buffer: ArrayBuffer | null = null;\n let lastError: unknown;\n\n for (let attempt = 0; attempt <= MAX_ENCODER_RETRIES; attempt++) {\n try {\n buffer = await attemptTranscode(ctx, outputFormat, videoCodec, audioCodec, quality, options);\n if (attempt > 0) {\n notes.push(\n `Encoder failed ${attempt} time${attempt === 1 ? \"\" : \"s\"} before succeeding ` +\n `(known headless Chromium WebCodecs encoder init issue): ${describeError(lastError)}`,\n );\n }\n break;\n } catch (err) {\n lastError = err;\n // Don't retry on user cancellation or permanent setup errors.\n if (options.signal?.aborted) throw err;\n if (!isLikelyEncoderInitError(err)) throw err;\n if (attempt === MAX_ENCODER_RETRIES) throw err;\n // Small backoff between attempts.\n await new Promise((r) => setTimeout(r, 50 * (attempt + 1)));\n }\n }\n\n const mimeType = mimeForFormat(outputFormat);\n const filename = generateFilename(ctx.name, outputFormat);\n\n if (options.outputStream) {\n // Streaming mode — data already written to the stream. Return empty blob.\n options.onProgress?.({ percent: 100, bytesWritten: 0 });\n return {\n blob: new Blob([], { type: mimeType }),\n mimeType,\n container: outputFormat,\n videoCodec: options.dropVideo ? undefined : videoCodec,\n audioCodec: options.dropAudio ? undefined : audioCodec,\n duration: ctx.duration,\n filename,\n ...(notes.length > 0 ? { notes } : {}),\n };\n }\n\n if (!buffer) {\n throw new Error(\"Transcode failed: no buffer produced (this should be unreachable).\");\n }\n\n const blob = new Blob([buffer], { type: mimeType });\n options.onProgress?.({ percent: 100, bytesWritten: blob.size });\n\n return {\n blob,\n mimeType,\n container: outputFormat,\n videoCodec: options.dropVideo ? undefined : videoCodec,\n audioCodec: options.dropAudio ? undefined : audioCodec,\n duration: ctx.duration,\n filename,\n ...(notes.length > 0 ? { notes } : {}),\n };\n}\n\n// ── Helpers ─────────────────────────────────────────────────────────────────\n\n/** @internal Exported for testing. */\nexport function defaultVideoCodec(format: OutputFormat): OutputVideoCodec {\n switch (format) {\n case \"webm\": return \"vp9\";\n case \"mp4\":\n case \"mkv\":\n default: return \"h264\";\n }\n}\n\n/** @internal Exported for testing. */\nexport function defaultAudioCodec(format: OutputFormat): OutputAudioCodec {\n switch (format) {\n case \"webm\": return \"opus\";\n case \"mp4\":\n case \"mkv\":\n default: return \"aac\";\n }\n}\n\n/** @internal Exported for testing. */\nexport function validateCodecCompatibility(\n format: OutputFormat,\n videoCodec: OutputVideoCodec,\n audioCodec: OutputAudioCodec,\n): void {\n // WebM only allows VP8/VP9/AV1 video and Opus/Vorbis audio.\n if (format === \"webm\") {\n if (videoCodec !== \"vp9\" && videoCodec !== \"av1\") {\n throw new Error(\n `WebM does not support video codec \"${videoCodec}\". Use \"vp9\" or \"av1\", or change outputFormat to \"mp4\" or \"mkv\".`,\n );\n }\n if (audioCodec !== \"opus\") {\n throw new Error(\n `WebM does not support audio codec \"${audioCodec}\". Use \"opus\", or change outputFormat to \"mp4\" or \"mkv\".`,\n );\n }\n }\n}\n\nfunction avbridgeVideoToMediabunny(c: OutputVideoCodec): \"avc\" | \"hevc\" | \"vp9\" | \"av1\" {\n switch (c) {\n case \"h264\": return \"avc\";\n case \"h265\": return \"hevc\";\n case \"vp9\": return \"vp9\";\n case \"av1\": return \"av1\";\n }\n}\n\nfunction avbridgeAudioToMediabunny(c: OutputAudioCodec): \"aac\" | \"opus\" | \"flac\" {\n switch (c) {\n case \"aac\": return \"aac\";\n case \"opus\": return \"opus\";\n case \"flac\": return \"flac\";\n }\n}\n\nfunction qualityToMediabunny(\n mb: typeof import(\"mediabunny\"),\n quality: TranscodeQuality,\n): InstanceType {\n switch (quality) {\n case \"low\": return mb.QUALITY_LOW;\n case \"medium\": return mb.QUALITY_MEDIUM;\n case \"high\": return mb.QUALITY_HIGH;\n case \"very-high\": return mb.QUALITY_VERY_HIGH;\n }\n}\n"]}