使用c socket完成下载后，Mp4文件无法播放

Question

我正在尝试使用C套接字下载mp4视频。文件已成功下载但当我尝试播放时无效。文件与原始文件大小相同。但他们的校验和是不同的。但是这段代码适用于pdf文件。 我很感激并感谢您的负担。

int main() {

    int socket_desc;
    char *message;
    char server_reply[100000];
    char *file_path = "file.mp4";
    ssize_t total_len = 0;
    char *ip = NULL;

    FILE *file = NULL;
    struct sockaddr_in server;

    //Create socket
    socket_desc = socket(AF_INET, SOCK_STREAM, 0);
    if (socket_desc == -1) {
        printf("dCould not create socket");
    }

    server.sin_addr.s_addr = inet_addr("195.154.200.24");
    server.sin_family = AF_INET;
    server.sin_port = htons(80);

    if (connect(socket_desc, (struct sockaddr *) &server, sizeof(server)) < 0) {
        printf("connect error");
        return 1;
    }

    message = "GET /upload_file/367/382/Indian%20Pop%20Hit%20Video%20Songs/Indian%20Pop%20Video%20Songs%202016%20-%20MP4/Jammin%20-%20Yaara%20-%20A%20R%20Rahman%20-%20Video%20MP4.mp4 HTTP/1.1\r\nHost: dl.pagal.link\r\n\r\n";

    if (send(socket_desc, message, strlen(message), 0) < 0) {
        printf("Send failed");
        return 1;
    }

    remove( file_path );
    file = fopen( file_path , "ab");

    if (file == NULL) {
        printf("File %s could not opened", file_path);
        return 1;
    }

    while (1) {
        ssize_t received_len = recv(socket_desc, server_reply, sizeof(server_reply), 0);

        if (received_len < 0) {
           printf("Received failed\n");
            return -1;
        }
        if (received_len == 0) {
            break;
        }

        fwrite(server_reply, (size_t) received_len, 1, file);
    }

    fclose(file);

    return 0;
}