linux librtmp怎样播放视频流 - 问答

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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