From 748653528674583d8116315ab45c73973ffa1890 Mon Sep 17 00:00:00 2001
From: flt6 <1404262047@qq.com>
Date: Sun, 4 Feb 2024 23:57:29 +0800
Subject: [PATCH] process_video

---
 process_video/process.cpp | 105 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 process_video/process.cpp

diff --git a/process_video/process.cpp b/process_video/process.cpp
new file mode 100644
index 0000000..2a06141
--- /dev/null
+++ b/process_video/process.cpp
@@ -0,0 +1,105 @@
+#include <iostream>
+#include <sstream>
+#include <fstream>
+#include <stdexcept>
+#include <vector>
+#include <string>
+#include <cstdlib>
+#include <cstdio>
+#include <filesystem>
+#include <algorithm>
+
+#ifdef _WIN32
+    const std::string DEVNULL = "NUL";
+#else
+    const std::string DEVNULL = "/dev/null";
+#endif
+
+
+using namespace std;
+namespace fs = std::filesystem;
+
+void runCommand(const string& command,const bool output=false) {
+    int ret;
+    if (!output)
+        ret = system((command + " > " + DEVNULL + " 2>&1").c_str());
+    else
+        ret = system(command.c_str());
+    if (ret != 0) {
+        cerr << "Command '" << command << "' failed." << endl;
+        exit(-1);
+    }
+}
+
+int main(int argc, char* argv[]) {
+    try {
+        runCommand("ffprobe -version");
+        runCommand("ffmpeg -version");
+    } catch (const exception& e) {
+        cerr << "'ffmpeg' or 'ffprobe' not installed." << endl;
+        exit(-1);
+    }
+
+    fs::path src;
+    if (argc == 3) {
+        string arg1 = argv[1];
+        if (arg1.front() == '"' && arg1.back() == '"')
+            src = fs::path(string(argv[2]).substr(1, string(argv[2]).size() - 2));
+        else
+            src = fs::path(argv[2]);
+    } else {
+        src = fs::path("/.NOT_EXIST_FILE.");
+    }
+
+    while (!fs::exists(src)) {
+        string ipt;
+        cout << "Enter the path to the source file: ";
+        getline(cin, ipt);
+        if (ipt.front() == '"' && ipt.back() == '"')
+            src = fs::path(ipt.substr(1, ipt.size() - 2));
+        else
+            src = fs::path(ipt);
+    }
+
+    string targetTime;
+    while (true) {
+        cout << "Enter the target time: ";
+        getline(cin, targetTime);
+        if (all_of(targetTime.begin(), targetTime.end(), ::isdigit))
+            break;
+    }
+    float targetTimeFloat = stof(targetTime);
+
+    string outputFile;
+    cout << "Output file (Default out.mp4): ";
+    getline(cin, outputFile);
+    if (outputFile.empty()) outputFile = "out.mp4";
+
+    string extraCMD;
+    cout << "Extra cmd: ";
+    getline(cin, extraCMD);
+
+    stringstream command;
+    command << "ffprobe -i " << src << " -show_entries format=duration -v quiet -of csv=p=0";
+    FILE* pipe = popen(command.str().c_str(), "r");
+    if (!pipe) {
+        cerr << "Error while invoking ffprobe." << endl;
+        return -1;
+    }
+    float srcTime;
+    if (fscanf(pipe, "%f", &srcTime) != 1) {
+        cerr << "Error reading output from ffprobe." << endl;
+        pclose(pipe);
+        return -1;
+    }
+    pclose(pipe);
+
+    float rate = targetTimeFloat / srcTime;
+
+    command.str("");
+    command << "ffmpeg -hide_banner -t " << srcTime << " -i " << src << " -vf setpts=PTS*" << rate
+            << " -r 30 -t " << targetTimeFloat << " " << extraCMD << " " << outputFile;
+    runCommand(command.str(),true);
+
+    return 0;
+}