Function convertMp4ToWebm

yvlu/yvlu.ts:179–216

(mp4Buffer: Buffer)

    return undefined;
  }
}

async function downloadMediaBuffer(client: any, target: any): Promise<Buffer | undefined> {
  if (!client || !target) return undefined;
  // For small media (thumbnails, static stickers, photos), try raw upload.GetFile first
  // Fall back to downloadMedia if raw download fails or isn't applicable
  try {
    const media = target.media ?? target;
    // Try to get document/photo info for raw download
    let doc = media?.document ?? media?.photo;
    if (doc && doc.id && doc.accessHash) {
      // Small files: use raw download
      const isLarge = doc.size && doc.size > 1024 * 1024;
      if (!isLarge) {
        const location = new Api.InputDocumentFileLocation({
          id: doc.id,
          accessHash: doc.accessHash,
          fileReference: doc.fileReference,
          thumbSize: "w",
        });
        const rawBuffer = await rawDownloadFile(client, location, doc.dcId);
        if (rawBuffer) return rawBuffer;
      }
    }
  } catch (_) {}
  // Fallback to downloadMedia with timeout
  try {
    const downloaded = await withTimeout(client.downloadMedia(target, { outputFile: path.join(os.tmpdir(), `yvlu_media_${Date.now()}_${Math.random().toString(16).slice(2)}`) }), QUOTE_RPC_TIMEOUT_MS, "downloadMediaBuffer.downloadMedia");
    if (Buffer.isBuffer(downloaded)) return downloaded;
    if (downloaded && typeof downloaded === "string" && fs.existsSync(downloaded)) return fs.readFileSync(downloaded);
  } catch (err: any) {
    console.warn("yvlu media download failed", err?.message || err);
  }
  return undefined;
}

// Helper to check if file format needs conversion
function needsConversion(buffer: Buffer, mimeType: string | undefined): boolean {
  if (!buffer || !mimeType) return false;
  return mimeType === "application/x-tgsticker" || // TGS
    mimeType === "video/mp4" || mimeType === "image/gif" || // GIF/MP4