c++通过链接下载抖音视频的代码
时间: 2023-08-06 11:02:49 浏览: 237
抖音是一款移动应用程序,其视频内容是存储在服务器上的,因此通过链接下载视频需要进行网络请求和视频解析等操作。这里提供一个基于C++的示例代码,使用libcurl库进行网络请求和下载操作,使用ffmpeg库进行视频解析和保存。
需要注意的是,抖音的视频链接是有时效性的,需要定期更新。
以下是示例代码:
```cpp
#include <iostream>
#include <fstream>
#include <string>
#include <curl/curl.h>
#include <libavformat/avformat.h>
using namespace std;
size_t write_data(void* ptr, size_t size, size_t nmemb, FILE* stream) {
return fwrite(ptr, size, nmemb, stream);
}
int main() {
// 抖音视频链接
string url = "https://aweme.snssdk.com/aweme/v1/play/?video_id=v0200fdd0000bem8c6r4k17e3hp2s930&line=0&file_id=ebe3f8b8c0fb4be0b968e9c6aa4dec1a&sign=0c5ae0f4d7d8a6f9ac1f1f98f6d0c909&is_play_url=1&source=PackSourceEnum_PUBLISH";
// 保存视频的文件名
string filename = "video.mp4";
CURL* curl = curl_easy_init();
if (curl) {
// 设置请求参数
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
// 发送请求
CURLcode res = curl_easy_perform(curl);
if (res != CURLE_OK) {
cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << endl;
}
else {
// 保存视频数据到文件
FILE* fp = fopen(filename.c_str(), "wb");
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
res = curl_easy_perform(curl);
fclose(fp);
if (res != CURLE_OK) {
cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << endl;
}
else {
// 解析视频文件并提取音视频流
av_register_all();
AVFormatContext* pFormatCtx = avformat_alloc_context();
if (avformat_open_input(&pFormatCtx, filename.c_str(), NULL, NULL) != 0) {
cerr << "Cannot open video file!" << endl;
return -1;
}
if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {
cerr << "Cannot find stream information!" << endl;
return -1;
}
AVCodec* pCodec = NULL;
int videoIndex = -1, audioIndex = -1;
for (int i = 0; i < pFormatCtx->nb_streams; i++) {
if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
videoIndex = i;
}
else if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
audioIndex = i;
}
}
if (videoIndex == -1 || audioIndex == -1) {
cerr << "Cannot find video or audio stream!" << endl;
return -1;
}
AVCodecParameters* pCodecParam = pFormatCtx->streams[videoIndex]->codecpar;
pCodec = avcodec_find_decoder(pCodecParam->codec_id);
if (pCodec == NULL) {
cerr << "Cannot find decoder for video stream!" << endl;
return -1;
}
AVCodecContext* pCodecCtx = avcodec_alloc_context3(pCodec);
if (avcodec_parameters_to_context(pCodecCtx, pCodecParam) < 0) {
cerr << "Cannot copy codec parameters to context!" << endl;
return -1;
}
if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
cerr << "Cannot open codec for video stream!" << endl;
return -1;
}
AVPacket* pPacket = av_packet_alloc();
AVFrame* pFrame = av_frame_alloc();
if (pPacket == NULL || pFrame == NULL) {
cerr << "Cannot allocate packet or frame!" << endl;
return -1;
}
while (av_read_frame(pFormatCtx, pPacket) >= 0) {
if (pPacket->stream_index == videoIndex || pPacket->stream_index == audioIndex) {
// 写入音视频数据到文件
ofstream fout;
if (pPacket->stream_index == videoIndex) {
fout.open("video.h264", ios::binary | ios::app);
}
else {
fout.open("audio.aac", ios::binary | ios::app);
}
fout.write((const char*)pPacket->data, pPacket->size);
fout.close();
}
av_packet_unref(pPacket);
}
avformat_close_input(&pFormatCtx);
av_packet_free(&pPacket);
av_frame_free(&pFrame);
avcodec_close(pCodecCtx);
avcodec_free_context(&pCodecCtx);
}
}
// 清理工作
curl_easy_cleanup(curl);
}
return 0;
}
```
在编译前需要安装libcurl和ffmpeg库,并将其包含路径和库文件路径添加到编译器中。
编译命令示例:
```bash
g++ -o download_video download_video.cpp -lcurl -lavformat -lavcodec -lavutil
```
运行后会在当前目录下生成视频文件、视频流文件和音频流文件。
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