Windows/Linux/Android/iOS平臺RTMP功能元件EasyRTMP-Android，推流H264到SRS無法播放原因是什麼？

SRS伺服器是定位於網際網路直播伺服器叢集的開源框架，TSINGSEE青犀視訊研發團隊也會拿SRS伺服器來進行流媒體服務的研發和對比。我們可以推送RTMP到SRS、推送RTSP/UDP/FLV到SRS、拉取流到SRS，同時SRS還支援將接入的RTMP流進行各種變換，譬如將RTMP流轉碼。

研發人員用EasyRTMP-Android測試伺服器推流功能時，選擇了推流到SRS伺服器，但是視訊流播放不了，並且出現如下圖的報錯：

分析問題：

因為RTMP協議的原因，推流庫在只推流視訊時，預設會加上無聲的音訊，取樣率是8000HZ，但是SRS伺服器處理不了這個取樣率的音訊，所以需要改成44.1kHZ的音訊，SRS伺服器才能處理。

解決問題：

原來的音訊格式是這樣的：

// 取樣率8k的音訊資料
private final char[] gAACMuteData = {
    0xFF, 0xF9, 0x6C, 0x40, 0x21, 0x5F, 0xFC, 0x01, 0x04, 0x34, 0x28, 0xAC, 0xE4, 0x69,
0x21, 0xBF, 0x1A, 0xD5, 0xEA, 0xE1, 0x49, 0x50, 0x54, 0x2A, 0x00, 0x02, 0x01, 0x96,
0x0C, 0x75, 0xD5, 0xBD, 0x53, 0x86, 0xEA, 0x9E, 0x03, 0x78, 0x92, 0xFE, 0xD1, 0xB0,
0x9D, 0x73, 0xFE, 0xCC, 0x42, 0xC2, 0xE4, 0xCD, 0x4A, 0x18, 0x8B, 0x01, 0xB0, 0xD5,
0xB9, 0x22, 0xD9, 0x93, 0x6C, 0x81, 0x5B, 0x2C, 0xA6, 0xD9, 0x9F, 0x85, 0x54, 0xC9,
0xB2, 0xEE, 0xC2, 0x9E, 0xB5, 0xDD, 0x75, 0x35, 0x57, 0xC9, 0x28, 0x97, 0x19, 0x4E,
0xCB, 0x98, 0x19, 0xEB, 0x29, 0x81, 0x34, 0x28, 0x65, 0x2E, 0x39, 0xD0, 0xD4, 0x02,
0x55, 0x30, 0x23, 0xDD, 0xA6, 0xF0, 0x79, 0xEA, 0x4C, 0x06, 0x93, 0x26, 0xB6, 0xFA,
0x21, 0x1F, 0x5A, 0x40, 0x19, 0x53, 0x03, 0x3D, 0x19, 0x5B, 0x81, 0xF4, 0xDF, 0x8B,
0x97, 0xAC, 0xF7, 0x93, 0x76, 0xE2, 0xF1, 0x42, 0x06, 0x97, 0xB9, 0x8B, 0xD2, 0x2B,
0x5F, 0x08, 0x71, 0xFE, 0x01, 0xB8, 0x04, 0x14, 0x0D, 0xF1, 0x44, 0xA5, 0x8E, 0xBC,
0x35, 0x31, 0x06, 0xAD, 0x4F, 0x2B, 0x18, 0xAF, 0x7E, 0x8B, 0x09, 0xEC, 0x84, 0xBA,
0x72, 0x79, 0x79, 0x5C, 0x91, 0x2B, 0x02, 0x0E, 0x54, 0x31, 0xEA, 0xA1, 0x48, 0x32,
0x1C, 0x98, 0x2C, 0xF9, 0x67, 0x2C, 0x74, 0xE0, 0x7C, 0xBD, 0x4F, 0x1D, 0x77, 0xDD,
0xB5, 0x61, 0x86, 0x34, 0x66, 0xB0, 0xC1, 0x01, 0x66, 0xC4, 0x9C, 0x02, 0xFD, 0xA3,
0x2A, 0xD0, 0xD7, 0x3C, 0x8D, 0x78, 0x2C, 0xC8, 0x01, 0x46, 0x80, 0xC1, 0x69, 0xBE,
0xA3, 0x95, 0x6B, 0x3A, 0xD2, 0x2A, 0x44, 0x97, 0x03, 0x05, 0x05, 0x01, 0xF8, 0x13,
0x81, 0xD5, 0xBB, 0x09, 0xAE, 0x6E, 0xAD, 0x75, 0xA0, 0xBA, 0x59, 0xE9, 0x96, 0x61,
0x18, 0x23, 0xFB, 0x76, 0xC1, 0x63, 0xA6, 0x8D, 0x6C, 0x80, 0xF7, 0xB0, 0x20, 0x70
};

即在aacThread執行緒中推流的預設音訊需要改成這樣：

// 取樣率44.1k的音訊資料
private final char[] gAACMuteData1 = {
0x21, 0x0A, 0xCF, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0x77, 0x61, 0xA0, 0x58, 0x20, 0x16,
0x0A, 0x05, 0x86, 0x81, 0x60, 0xC0, 0x58, 0x30, 0x16, 0x0A, 0x06, 0x04, 0x95, 0x20,
0xA8, 0x59, 0xD6, 0xB7, 0x78, 0xEF, 0x89, 0x7E, 0x26, 0xB7, 0xC6, 0x54, 0x8C, 0xB2,
0x92, 0xA2, 0x84, 0x54, 0x74, 0x3D, 0x05, 0xF7, 0xEF, 0xE5, 0xAB, 0xE1, 0x25, 0xAB,
0x49, 0xFF, 0xDB, 0x5F, 0x9F, 0xC9, 0x77, 0x7A, 0xC9, 0xC3, 0xFF, 0x2F, 0xC5, 0xD6,
0x4F, 0xD4, 0xCB, 0x8B, 0xDC, 0xE8, 0x0F, 0x67, 0xBF, 0x39, 0xE4, 0x82, 0x3D, 0x57,
0xE3, 0xCB, 0xBF, 0x6F, 0xAB, 0x4E, 0x80, 0x4A, 0x27, 0xB1, 0xE1, 0xD8, 0xD3, 0x20,
0x6F, 0xFC, 0xF3, 0x76, 0x0C, 0xE6, 0xFA, 0xC3, 0x2E, 0x82, 0x47, 0xE0, 0x5C, 0xEC,
0x03, 0xD3, 0xD1, 0x1C, 0xD4, 0x1E, 0x6F, 0xF0, 0x93, 0x24, 0xFA, 0x8F, 0x4C, 0xD1,
0xDD, 0x3E, 0x26, 0x9A, 0xB7, 0x2D, 0xF4, 0x0E, 0x6F, 0x66, 0xB9, 0xF4, 0x7B, 0x68,
0x5A, 0x5F, 0x4A, 0x73, 0x5E, 0xF7, 0xBA, 0xE8, 0x7C, 0x4E, 0xA8, 0x19, 0x5D, 0x48,
0xA4, 0x7E, 0x5D, 0x63, 0xF8, 0x1D, 0x9E, 0x9D, 0x3D, 0xF8, 0x2C, 0x04, 0xD2, 0x18,
0x17, 0xCE, 0x0C, 0x4B, 0xCF, 0x9D, 0x4E, 0x17, 0x37, 0x88, 0xDF, 0x66, 0x48, 0xF1,
0x17, 0xA5, 0xCC, 0xF7, 0xF9, 0xCA, 0xD7, 0xF0, 0x41, 0x26, 0x57, 0x49, 0x40, 0xE0,
0x20, 0x72, 0x6C, 0xAD, 0xBC, 0x8B, 0x9E, 0x84, 0x99, 0xB3, 0x13, 0x5C, 0x42, 0x66,
0xAB, 0x6F, 0xF4, 0x6B, 0xA2, 0xCB, 0x4B, 0x4D, 0x5F, 0x38, 0xAD, 0x35, 0xC9, 0xFC,
0xC9, 0x6F, 0x9D, 0x38, 0xE6, 0x78, 0xAE, 0xED, 0x1F, 0x47, 0x81, 0x39, 0xE7, 0xA5,
0x3C, 0x9B, 0x23, 0xE6, 0xF5, 0xD7, 0x7A, 0x3E, 0xBF, 0x37, 0x96, 0x80, 0x01, 0x68,
0x02, 0x81, 0x61, 0x20, 0x40, 0x28, 0x10, 0x0B, 0x04, 0x04, 0xC4, 0x40, 0xB0, 0x40,
0x2C, 0x34, 0x23, 0x05, 0x02, 0xC5, 0x41, 0xB0, 0x50, 0x2C, 0x14, 0x08, 0x05, 0x04,
0x01, 0xFF, 0xC3, 0x2D, 0x2A, 0x54, 0x55, 0xD2, 0x82, 0x90, 0x54, 0xCB, 0xAA, 0x2C,
0x7F, 0xA2, 0x3D, 0x3E, 0x23, 0xFF, 0xC7, 0xE8, 0x67, 0xC7, 0x42, 0xDC, 0x70, 0xB8,
0xE8, 0xA7, 0x44, 0x35, 0xDA, 0x6B, 0x01, 0x3F, 0xD7, 0xA4, 0x4B, 0x38, 0x28, 0xC6,
0x5B, 0xC8, 0xF9, 0xF6, 0xD6, 0x8A, 0xC7, 0xB6, 0x5A, 0x4F, 0x5F, 0xF7, 0xC0, 0x3D,
0xDF, 0x34, 0xD4, 0x9B, 0x2F, 0x75, 0xF8, 0x14, 0xFB, 0x07, 0xC4, 0x0B, 0xF0, 0x5C,
0x9B, 0x54, 0xCF, 0xFD, 0x59, 0xF0, 0xA2, 0xC6, 0xAF, 0x9E, 0xAE, 0x24, 0x81, 0xCB,
0x64, 0xFC, 0x7F, 0xE6, 0x09, 0x6F, 0x7A, 0x19, 0xE2, 0xB6, 0x98, 0x22, 0x42, 0xBB,
0x7A, 0x95, 0x3C, 0xE4, 0x8B, 0x98, 0xA1, 0x97, 0x02, 0x67, 0xA6, 0x71, 0x20, 0xCD,
0x3C, 0x6E, 0x77, 0x45, 0x22, 0x81, 0x10, 0x43, 0x80, 0xAE, 0xAC, 0x50, 0xF5, 0x4F,
0x04, 0x14, 0x70, 0xAF, 0x02, 0x26, 0x32, 0x7E, 0x6E, 0x37, 0xFF, 0x9F, 0x74, 0xF7,
0x3E, 0x39, 0xA1, 0x83, 0xCC, 0x6E, 0xD4, 0xA7, 0xE8, 0x89, 0x7F, 0x61, 0xF7, 0x54,
0x9C, 0xD3, 0xBC, 0x49, 0xAA, 0xC0, 0x7A, 0x36, 0x94, 0x41, 0xCE, 0xE7, 0x34, 0x51,
0x13, 0x01, 0xBE, 0x53, 0xA0, 0x5F, 0x82, 0x2E, 0x1B, 0x8B, 0xA5, 0xFA, 0xA7, 0x8F,
0xF9, 0x9E, 0x90, 0xED, 0x4B, 0x89, 0x01, 0xE5, 0x95, 0xE8, 0x2C, 0x9F, 0x58, 0x6F,
0x7B, 0xBF, 0x87, 0x72, 0xEE, 0x29, 0xA4, 0x8C, 0x67, 0xE6, 0x72, 0xEF, 0xCA, 0x72,
0x21, 0x7B, 0x7E, 0xB6, 0xFE, 0x5F, 0xF7, 0xF8, 0x72, 0xAF, 0x3C, 0xFE, 0xE8, 0x4F, 0x80
};