linux librtmp怎样播放视频流

要在Linux上使用librtmp库播放视频流，您需要执行以下步骤：

安装librtmp库：对于Debian/Ubuntu系统，使用以下命令安装：
```
sudo apt-get install librtmp-dev 
```
对于CentOS/RHEL系统，使用以下命令安装：
```
sudo yum install librtmp-devel 
```
编写一个简单的C程序来播放RTMP流。以下是一个示例程序：

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <rtmp.h> int main(int argc, char *argv[]) { RTMP *rtmp = NULL; RTMP_ConnParams *conn_params = NULL; RTMP_Netbuf *netbuf = NULL; RTMP_Packet packet; if (argc != 3) { printf("Usage: %s <rtmp_url> <stream_key>\n", argv[0]); return 1; } rtmp = RTMP_Alloc(); if (!rtmp) { fprintf(stderr, "Failed to allocate RTMP instance.\n"); return 1; } conn_params = RTMP_ConnParams_Create(); if (!conn_params) { fprintf(stderr, "Failed to create connection parameters.\n"); RTMP_Free(rtmp); return 1; } RTMP_Init(rtmp); RTMP_SetupURL(rtmp, argv[1]); RTMP_SetConnParams(rtmp, conn_params); if (RTMP_Connect(rtmp, NULL) != RTMP_OK) { fprintf(stderr, "Failed to connect to RTMP server: %s\n", RTMP_GetError(rtmp)); RTMP_Free(rtmp); RTMP_ConnParams_Free(conn_params); return 1; } if (RTMP_ConnectStream(rtmp, 0) != RTMP_OK) { fprintf(stderr, "Failed to connect to stream: %s\n", RTMP_GetError(rtmp)); RTMP_Close(rtmp); RTMP_Free(rtmp); RTMP_ConnParams_Free(conn_params); return 1; } netbuf = RTMP_AllocBuffer(rtmp, 1024 * 1024); // Allocate 1MB buffer if (!netbuf) { fprintf(stderr, "Failed to allocate network buffer.\n"); RTMP_Close(rtmp); RTMP_Free(rtmp); RTMP_ConnParams_Free(conn_params); return 1; } while (RTMP_Read(rtmp, netbuf, -1) == RTMP_OK) { RTMP_Packet_Init(&packet); RTMP_GetPacket(rtmp, &packet); if (packet.m_headerType == RTMP_PacketHeaderType_Audio || packet.m_headerType == RTMP_PacketHeaderType_Video) { printf("Playing video frame...\n"); // Process the video frame (packet.data, packet.length) here } RTMP_FreePacket(&packet); } RTMP_Close(rtmp); RTMP_Free(rtmp); RTMP_ConnParams_Free(conn_params); RTMP_FreeBuffer(netbuf); return 0; }

编译程序：使用以下命令编译程序：
```
gcc -o play_video play_video.c -lrtmp 
```
运行程序：使用以下命令运行程序，将<rtmp_url>替换为您的RTMP流地址，将<stream_key>替换为流密钥：
```
./play_video <rtmp_url> <stream_key> 
```

这个示例程序将连接到指定的RTMP服务器，播放视频流，并在控制台输出“Playing video frame…”。您可以根据需要修改程序以处理视频帧。

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