Function encodeFramesToWebm

quote/quote.ts:948–991

(frames: Buffer[], fps = TG_STICKER_FPS)

    let imageBuffer = buffer;
    const isVideoLike = kind === "animation" || kind === "video" || kind === "round" || looksLikeAnimatedEmoji(buffer);
    if (isVideoLike) {
      const converted = await convertAnimatedEmojiToPng(buffer);
      if (converted) imageBuffer = converted;
    } else if (kind === "sticker") {
      imageBuffer = await (await getSharp())(buffer, { animated: false }).ensureAlpha().png({ force: true }).toBuffer();
    }
    const { createCanvas, loadImage } = await getCanvas();
    const img = await loadImage(imageBuffer);
    const canvas = createCanvas(img.width, img.height);
    const ctx = canvas.getContext("2d");
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.drawImage(img, 0, 0);
    return canvas;
  } catch (err: any) {
    console.warn("quote media canvas failed", kind, err?.message || err);
    return undefined;
  }
}

async function prepareQuoteMedia(msg: Api.Message, args: QuoteArgs): Promise<{
  mediaBuffer?: Buffer;
  mediaCanvas?: any;
  mediaType?: string;
  mediaMaxSize?: number;
  mediaCrop?: boolean;
  mediaDuration?: number;
  voice?: { waveform: number[]; duration?: number };
  /** quote-api attachments.js: file_name / file_size */
  document?: { file_name: string; file_size?: number };
  /** quote-api attachments.js: title / performer / duration / thumb */
  audio?: { title?: string; performer?: string; duration?: number; thumb?: any };
}> {
  const kind = getMediaKind(msg);
  const waveform = kind === "voice" ? voiceWaveform(msg) : undefined;
  const voiceAttr = audioAttribute(msg);
  const duration = Number(voiceAttr?.duration ?? voiceAttr?.voiceDuration ?? 0) || undefined;
  const videoAttr = getDocumentAttributes(msg).find((a: any) =>
    (a.className || a.constructor?.name || "").includes("Video")
  );
  const mediaDuration =
    kind === "video" || kind === "animation" || kind === "round"
      ? Number(videoAttr?.duration ?? 0) || undefined
      : kind === "voice" || kind === "audio"
        ? duration
        : undefined;

  // Glass: voice/document/audio → in-bubble rows; photo/sticker/video/gif → mediaCanvas + badges